return bytes_to_frames(substream->runtime, current_ptr);
 }
 
-static struct snd_pcm_ops snd_als300_playback_ops = {
+static const struct snd_pcm_ops snd_als300_playback_ops = {
        .open =         snd_als300_playback_open,
        .close =        snd_als300_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_als300_pointer,
 };
 
-static struct snd_pcm_ops snd_als300_capture_ops = {
+static const struct snd_pcm_ops snd_als300_capture_ops = {
        .open =         snd_als300_capture_open,
        .close =        snd_als300_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 
 /******************************************************************/
 
-static struct snd_pcm_ops snd_als4000_playback_ops = {
+static const struct snd_pcm_ops snd_als4000_playback_ops = {
        .open =         snd_als4000_playback_open,
        .close =        snd_als4000_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_als4000_playback_pointer
 };
 
-static struct snd_pcm_ops snd_als4000_capture_ops = {
+static const struct snd_pcm_ops snd_als4000_capture_ops = {
        .open =         snd_als4000_capture_open,
        .close =        snd_als4000_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_card_asihpi_playback_mmap_ops = {
+static const struct snd_pcm_ops snd_card_asihpi_playback_mmap_ops = {
        .open = snd_card_asihpi_playback_open,
        .close = snd_card_asihpi_playback_close,
        .ioctl = snd_card_asihpi_playback_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_card_asihpi_capture_mmap_ops = {
+static const struct snd_pcm_ops snd_card_asihpi_capture_mmap_ops = {
        .open = snd_card_asihpi_capture_open,
        .close = snd_card_asihpi_capture_close,
        .ioctl = snd_card_asihpi_capture_ioctl,
 
 }
 
 /* AC97 playback */
-static struct snd_pcm_ops snd_atiixp_playback_ops = {
+static const struct snd_pcm_ops snd_atiixp_playback_ops = {
        .open =         snd_atiixp_playback_open,
        .close =        snd_atiixp_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* AC97 capture */
-static struct snd_pcm_ops snd_atiixp_capture_ops = {
+static const struct snd_pcm_ops snd_atiixp_capture_ops = {
        .open =         snd_atiixp_capture_open,
        .close =        snd_atiixp_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* SPDIF playback */
-static struct snd_pcm_ops snd_atiixp_spdif_ops = {
+static const struct snd_pcm_ops snd_atiixp_spdif_ops = {
        .open =         snd_atiixp_spdif_open,
        .close =        snd_atiixp_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 
 
 /* AC97 playback */
-static struct snd_pcm_ops snd_atiixp_playback_ops = {
+static const struct snd_pcm_ops snd_atiixp_playback_ops = {
        .open =         snd_atiixp_playback_open,
        .close =        snd_atiixp_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* AC97 capture */
-static struct snd_pcm_ops snd_atiixp_capture_ops = {
+static const struct snd_pcm_ops snd_atiixp_capture_ops = {
        .open =         snd_atiixp_capture_open,
        .close =        snd_atiixp_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 module_pci_driver(aw2_driver);
 
 /* operators for playback PCM alsa interface */
-static struct snd_pcm_ops snd_aw2_playback_ops = {
+static const struct snd_pcm_ops snd_aw2_playback_ops = {
        .open = snd_aw2_pcm_playback_open,
        .close = snd_aw2_pcm_playback_close,
        .ioctl = snd_pcm_lib_ioctl,
 };
 
 /* operators for capture PCM alsa interface */
-static struct snd_pcm_ops snd_aw2_capture_ops = {
+static const struct snd_pcm_ops snd_aw2_capture_ops = {
        .open = snd_aw2_pcm_capture_open,
        .close = snd_aw2_pcm_capture_close,
        .ioctl = snd_pcm_lib_ioctl,
 
 
 /******************************************************************/
 
-static struct snd_pcm_ops snd_azf3328_playback_ops = {
+static const struct snd_pcm_ops snd_azf3328_playback_ops = {
        .open =         snd_azf3328_pcm_playback_open,
        .close =        snd_azf3328_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_azf3328_pcm_pointer
 };
 
-static struct snd_pcm_ops snd_azf3328_capture_ops = {
+static const struct snd_pcm_ops snd_azf3328_capture_ops = {
        .open =         snd_azf3328_pcm_capture_open,
        .close =        snd_azf3328_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_azf3328_pcm_pointer
 };
 
-static struct snd_pcm_ops snd_azf3328_i2s_out_ops = {
+static const struct snd_pcm_ops snd_azf3328_i2s_out_ops = {
        .open =         snd_azf3328_pcm_i2s_out_open,
        .close =        snd_azf3328_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 }
 
 /* operators */
-static struct snd_pcm_ops snd_ca0106_playback_front_ops = {
+static const struct snd_pcm_ops snd_ca0106_playback_front_ops = {
        .open =        snd_ca0106_pcm_open_playback_front,
        .close =       snd_ca0106_pcm_close_playback,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_ca0106_pcm_pointer_playback,
 };
 
-static struct snd_pcm_ops snd_ca0106_capture_0_ops = {
+static const struct snd_pcm_ops snd_ca0106_capture_0_ops = {
        .open =        snd_ca0106_pcm_open_0_capture,
        .close =       snd_ca0106_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_ca0106_pcm_pointer_capture,
 };
 
-static struct snd_pcm_ops snd_ca0106_capture_1_ops = {
+static const struct snd_pcm_ops snd_ca0106_capture_1_ops = {
        .open =        snd_ca0106_pcm_open_1_capture,
        .close =       snd_ca0106_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_ca0106_pcm_pointer_capture,
 };
 
-static struct snd_pcm_ops snd_ca0106_capture_2_ops = {
+static const struct snd_pcm_ops snd_ca0106_capture_2_ops = {
        .open =        snd_ca0106_pcm_open_2_capture,
        .close =       snd_ca0106_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_ca0106_pcm_pointer_capture,
 };
 
-static struct snd_pcm_ops snd_ca0106_capture_3_ops = {
+static const struct snd_pcm_ops snd_ca0106_capture_3_ops = {
        .open =        snd_ca0106_pcm_open_3_capture,
        .close =       snd_ca0106_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_ca0106_pcm_pointer_capture,
 };
 
-static struct snd_pcm_ops snd_ca0106_playback_center_lfe_ops = {
+static const struct snd_pcm_ops snd_ca0106_playback_center_lfe_ops = {
         .open =         snd_ca0106_pcm_open_playback_center_lfe,
         .close =        snd_ca0106_pcm_close_playback,
         .ioctl =        snd_pcm_lib_ioctl,
         .pointer =      snd_ca0106_pcm_pointer_playback, 
 };
 
-static struct snd_pcm_ops snd_ca0106_playback_unknown_ops = {
+static const struct snd_pcm_ops snd_ca0106_playback_unknown_ops = {
         .open =         snd_ca0106_pcm_open_playback_unknown,
         .close =        snd_ca0106_pcm_close_playback,
         .ioctl =        snd_pcm_lib_ioctl,
         .pointer =      snd_ca0106_pcm_pointer_playback, 
 };
 
-static struct snd_pcm_ops snd_ca0106_playback_rear_ops = {
+static const struct snd_pcm_ops snd_ca0106_playback_rear_ops = {
         .open =         snd_ca0106_pcm_open_playback_rear,
         .close =        snd_ca0106_pcm_close_playback,
         .ioctl =        snd_pcm_lib_ioctl,
 
 /*
  */
 
-static struct snd_pcm_ops snd_cmipci_playback_ops = {
+static const struct snd_pcm_ops snd_cmipci_playback_ops = {
        .open =         snd_cmipci_playback_open,
        .close =        snd_cmipci_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_cmipci_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_cmipci_capture_ops = {
+static const struct snd_pcm_ops snd_cmipci_capture_ops = {
        .open =         snd_cmipci_capture_open,
        .close =        snd_cmipci_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_cmipci_capture_pointer,
 };
 
-static struct snd_pcm_ops snd_cmipci_playback2_ops = {
+static const struct snd_pcm_ops snd_cmipci_playback2_ops = {
        .open =         snd_cmipci_playback2_open,
        .close =        snd_cmipci_playback2_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_cmipci_capture_pointer,     /* channel B */
 };
 
-static struct snd_pcm_ops snd_cmipci_playback_spdif_ops = {
+static const struct snd_pcm_ops snd_cmipci_playback_spdif_ops = {
        .open =         snd_cmipci_playback_spdif_open,
        .close =        snd_cmipci_playback_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_cmipci_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_cmipci_capture_spdif_ops = {
+static const struct snd_pcm_ops snd_cmipci_capture_spdif_ops = {
        .open =         snd_cmipci_capture_spdif_open,
        .close =        snd_cmipci_capture_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_cs4281_playback_ops = {
+static const struct snd_pcm_ops snd_cs4281_playback_ops = {
        .open =         snd_cs4281_playback_open,
        .close =        snd_cs4281_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_cs4281_pointer,
 };
 
-static struct snd_pcm_ops snd_cs4281_capture_ops = {
+static const struct snd_pcm_ops snd_cs4281_capture_ops = {
        .open =         snd_cs4281_capture_open,
        .close =        snd_cs4281_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 }
 
 /* PCM operators for playback */
-static struct snd_pcm_ops ct_pcm_playback_ops = {
+static const struct snd_pcm_ops ct_pcm_playback_ops = {
        .open           = ct_pcm_playback_open,
        .close          = ct_pcm_playback_close,
        .ioctl          = snd_pcm_lib_ioctl,
 };
 
 /* PCM operators for capture */
-static struct snd_pcm_ops ct_pcm_capture_ops = {
+static const struct snd_pcm_ops ct_pcm_capture_ops = {
        .open           = ct_pcm_capture_open,
        .close          = ct_pcm_capture_close,
        .ioctl          = snd_pcm_lib_ioctl,
 
 }
 
 /* operators */
-static struct snd_pcm_ops snd_emu10k1x_playback_ops = {
+static const struct snd_pcm_ops snd_emu10k1x_playback_ops = {
        .open =        snd_emu10k1x_playback_open,
        .close =       snd_emu10k1x_playback_close,
        .ioctl =       snd_pcm_lib_ioctl,
        return ptr;
 }
 
-static struct snd_pcm_ops snd_emu10k1x_capture_ops = {
+static const struct snd_pcm_ops snd_emu10k1x_capture_ops = {
        .open =        snd_emu10k1x_pcm_open_capture,
        .close =       snd_emu10k1x_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_emu10k1_playback_ops = {
+static const struct snd_pcm_ops snd_emu10k1_playback_ops = {
        .open =                 snd_emu10k1_playback_open,
        .close =                snd_emu10k1_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .page =                 snd_pcm_sgbuf_ops_page,
 };
 
-static struct snd_pcm_ops snd_emu10k1_capture_ops = {
+static const struct snd_pcm_ops snd_emu10k1_capture_ops = {
        .open =                 snd_emu10k1_capture_open,
        .close =                snd_emu10k1_capture_close,
        .ioctl =                snd_pcm_lib_ioctl,
 };
 
 /* EFX playback */
-static struct snd_pcm_ops snd_emu10k1_efx_playback_ops = {
+static const struct snd_pcm_ops snd_emu10k1_efx_playback_ops = {
        .open =                 snd_emu10k1_efx_playback_open,
        .close =                snd_emu10k1_efx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
 }
 
 
-static struct snd_pcm_ops snd_emu10k1_capture_mic_ops = {
+static const struct snd_pcm_ops snd_emu10k1_capture_mic_ops = {
        .open =                 snd_emu10k1_capture_mic_open,
        .close =                snd_emu10k1_capture_mic_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .put = snd_emu10k1_pcm_efx_voices_mask_put
 };
 
-static struct snd_pcm_ops snd_emu10k1_capture_efx_ops = {
+static const struct snd_pcm_ops snd_emu10k1_capture_efx_ops = {
        .open =                 snd_emu10k1_capture_efx_open,
        .close =                snd_emu10k1_capture_efx_close,
        .ioctl =                snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_emu10k1_fx8010_playback_ops = {
+static const struct snd_pcm_ops snd_emu10k1_fx8010_playback_ops = {
        .open =                 snd_emu10k1_fx8010_playback_open,
        .close =                snd_emu10k1_fx8010_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
 
 }
 
 /* operators */
-static struct snd_pcm_ops snd_p16v_playback_front_ops = {
+static const struct snd_pcm_ops snd_p16v_playback_front_ops = {
        .open =        snd_p16v_pcm_open_playback_front,
        .close =       snd_p16v_pcm_close_playback,
        .ioctl =       snd_pcm_lib_ioctl,
        .pointer =     snd_p16v_pcm_pointer_playback,
 };
 
-static struct snd_pcm_ops snd_p16v_capture_ops = {
+static const struct snd_pcm_ops snd_p16v_capture_ops = {
        .open =        snd_p16v_pcm_open_capture,
        .close =       snd_p16v_pcm_close_capture,
        .ioctl =       snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_ensoniq_playback1_ops = {
+static const struct snd_pcm_ops snd_ensoniq_playback1_ops = {
        .open =         snd_ensoniq_playback1_open,
        .close =        snd_ensoniq_playback1_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_ensoniq_playback1_pointer,
 };
 
-static struct snd_pcm_ops snd_ensoniq_playback2_ops = {
+static const struct snd_pcm_ops snd_ensoniq_playback2_ops = {
        .open =         snd_ensoniq_playback2_open,
        .close =        snd_ensoniq_playback2_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_ensoniq_playback2_pointer,
 };
 
-static struct snd_pcm_ops snd_ensoniq_capture_ops = {
+static const struct snd_pcm_ops snd_ensoniq_capture_ops = {
        .open =         snd_ensoniq_capture_open,
        .close =        snd_ensoniq_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_es1938_playback_ops = {
+static const struct snd_pcm_ops snd_es1938_playback_ops = {
        .open =         snd_es1938_playback_open,
        .close =        snd_es1938_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_es1938_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_es1938_capture_ops = {
+static const struct snd_pcm_ops snd_es1938_capture_ops = {
        .open =         snd_es1938_capture_open,
        .close =        snd_es1938_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_es1968_playback_ops = {
+static const struct snd_pcm_ops snd_es1968_playback_ops = {
        .open =         snd_es1968_playback_open,
        .close =        snd_es1968_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_es1968_pcm_pointer,
 };
 
-static struct snd_pcm_ops snd_es1968_capture_ops = {
+static const struct snd_pcm_ops snd_es1968_capture_ops = {
        .open =         snd_es1968_capture_open,
        .close =        snd_es1968_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_fm801_playback_ops = {
+static const struct snd_pcm_ops snd_fm801_playback_ops = {
        .open =         snd_fm801_playback_open,
        .close =        snd_fm801_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_fm801_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_fm801_capture_ops = {
+static const struct snd_pcm_ops snd_fm801_capture_ops = {
        .open =         snd_fm801_capture_open,
        .close =        snd_fm801_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return snd_pcm_lib_default_mmap(substream, area);
 }
 
-static struct snd_pcm_ops azx_pcm_ops = {
+static const struct snd_pcm_ops azx_pcm_ops = {
        .open = azx_pcm_open,
        .close = azx_pcm_close,
        .ioctl = snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_ice1712_playback_ops = {
+static const struct snd_pcm_ops snd_ice1712_playback_ops = {
        .open =         snd_ice1712_playback_open,
        .close =        snd_ice1712_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_ice1712_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_ice1712_playback_ds_ops = {
+static const struct snd_pcm_ops snd_ice1712_playback_ds_ops = {
        .open =         snd_ice1712_playback_ds_open,
        .close =        snd_ice1712_playback_ds_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_ice1712_playback_ds_pointer,
 };
 
-static struct snd_pcm_ops snd_ice1712_capture_ops = {
+static const struct snd_pcm_ops snd_ice1712_capture_ops = {
        .open =         snd_ice1712_capture_open,
        .close =        snd_ice1712_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_ice1712_playback_pro_ops = {
+static const struct snd_pcm_ops snd_ice1712_playback_pro_ops = {
        .open =         snd_ice1712_playback_pro_open,
        .close =        snd_ice1712_playback_pro_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_ice1712_playback_pro_pointer,
 };
 
-static struct snd_pcm_ops snd_ice1712_capture_pro_ops = {
+static const struct snd_pcm_ops snd_ice1712_capture_pro_ops = {
        .open =         snd_ice1712_capture_pro_open,
        .close =        snd_ice1712_capture_pro_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_vt1724_playback_pro_ops = {
+static const struct snd_pcm_ops snd_vt1724_playback_pro_ops = {
        .open =         snd_vt1724_playback_pro_open,
        .close =        snd_vt1724_playback_pro_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_vt1724_playback_pro_pointer,
 };
 
-static struct snd_pcm_ops snd_vt1724_capture_pro_ops = {
+static const struct snd_pcm_ops snd_vt1724_capture_pro_ops = {
        .open =         snd_vt1724_capture_pro_open,
        .close =        snd_vt1724_capture_pro_close,
        .ioctl =        snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_vt1724_playback_spdif_ops = {
+static const struct snd_pcm_ops snd_vt1724_playback_spdif_ops = {
        .open =         snd_vt1724_playback_spdif_open,
        .close =        snd_vt1724_playback_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_vt1724_pcm_pointer,
 };
 
-static struct snd_pcm_ops snd_vt1724_capture_spdif_ops = {
+static const struct snd_pcm_ops snd_vt1724_capture_spdif_ops = {
        .open =         snd_vt1724_capture_spdif_open,
        .close =        snd_vt1724_capture_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_vt1724_playback_indep_ops = {
+static const struct snd_pcm_ops snd_vt1724_playback_indep_ops = {
        .open =         snd_vt1724_playback_indep_open,
        .close =        snd_vt1724_playback_indep_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return snd_korg1212_copy_to(korg1212, dst, pos, count, 0, korg1212->channels * 2);
 }
 
-static struct snd_pcm_ops snd_korg1212_playback_ops = {
+static const struct snd_pcm_ops snd_korg1212_playback_ops = {
         .open =                snd_korg1212_playback_open,
         .close =       snd_korg1212_playback_close,
         .ioctl =       snd_korg1212_ioctl,
         .silence =     snd_korg1212_playback_silence,
 };
 
-static struct snd_pcm_ops snd_korg1212_capture_ops = {
+static const struct snd_pcm_ops snd_korg1212_capture_ops = {
        .open =         snd_korg1212_capture_open,
        .close =        snd_korg1212_capture_close,
        .ioctl =        snd_korg1212_ioctl,
 
        }
 }
 
-static struct snd_pcm_ops lola_pcm_ops = {
+static const struct snd_pcm_ops lola_pcm_ops = {
        .open = lola_pcm_open,
        .close = lola_pcm_close,
        .ioctl = snd_pcm_lib_ioctl,
 
        return err;
 }
 
-static struct snd_pcm_ops lx_ops_playback = {
+static const struct snd_pcm_ops lx_ops_playback = {
        .open      = lx_pcm_open,
        .close     = lx_pcm_close,
        .ioctl     = snd_pcm_lib_ioctl,
        .pointer   = lx_pcm_stream_pointer,
 };
 
-static struct snd_pcm_ops lx_ops_capture = {
+static const struct snd_pcm_ops lx_ops_capture = {
        .open      = lx_pcm_open,
        .close     = lx_pcm_close,
        .ioctl     = snd_pcm_lib_ioctl,
 
  * create pcm instance
  */
 
-static struct snd_pcm_ops snd_m3_playback_ops = {
+static const struct snd_pcm_ops snd_m3_playback_ops = {
        .open =         snd_m3_playback_open,
        .close =        snd_m3_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_m3_pcm_pointer,
 };
 
-static struct snd_pcm_ops snd_m3_capture_ops = {
+static const struct snd_pcm_ops snd_m3_capture_ops = {
        .open =         snd_m3_capture_open,
        .close =        snd_m3_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 
 
 
-static struct snd_pcm_ops snd_mixart_playback_ops = {
+static const struct snd_pcm_ops snd_mixart_playback_ops = {
        .open      = snd_mixart_playback_open,
        .close     = snd_mixart_close,
        .ioctl     = snd_pcm_lib_ioctl,
        .pointer   = snd_mixart_stream_pointer,
 };
 
-static struct snd_pcm_ops snd_mixart_capture_ops = {
+static const struct snd_pcm_ops snd_mixart_capture_ops = {
        .open      = snd_mixart_capture_open,
        .close     = snd_mixart_close,
        .ioctl     = snd_pcm_lib_ioctl,
 
 /*
  * create a pcm instance
  */
-static struct snd_pcm_ops snd_nm256_playback_ops = {
+static const struct snd_pcm_ops snd_nm256_playback_ops = {
        .open =         snd_nm256_playback_open,
        .close =        snd_nm256_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_nm256_capture_ops = {
+static const struct snd_pcm_ops snd_nm256_capture_ops = {
        .open =         snd_nm256_capture_open,
        .close =        snd_nm256_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 }
 
 
-static struct snd_pcm_ops pcxhr_ops = {
+static const struct snd_pcm_ops pcxhr_ops = {
        .open      = pcxhr_open,
        .close     = pcxhr_close,
        .ioctl     = snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_riptide_playback_ops = {
+static const struct snd_pcm_ops snd_riptide_playback_ops = {
        .open = snd_riptide_playback_open,
        .close = snd_riptide_playback_close,
        .ioctl = snd_pcm_lib_ioctl,
        .trigger = snd_riptide_trigger,
        .pointer = snd_riptide_pointer,
 };
-static struct snd_pcm_ops snd_riptide_capture_ops = {
+static const struct snd_pcm_ops snd_riptide_capture_ops = {
        .open = snd_riptide_capture_open,
        .close = snd_riptide_capture_close,
        .ioctl = snd_pcm_lib_ioctl,
 
 }
 
 /* for halfduplex mode */
-static struct snd_pcm_ops snd_rme32_playback_spdif_ops = {
+static const struct snd_pcm_ops snd_rme32_playback_spdif_ops = {
        .open =         snd_rme32_playback_spdif_open,
        .close =        snd_rme32_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme32_capture_spdif_ops = {
+static const struct snd_pcm_ops snd_rme32_capture_spdif_ops = {
        .open =         snd_rme32_capture_spdif_open,
        .close =        snd_rme32_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme32_playback_adat_ops = {
+static const struct snd_pcm_ops snd_rme32_playback_adat_ops = {
        .open =         snd_rme32_playback_adat_open,
        .close =        snd_rme32_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme32_capture_adat_ops = {
+static const struct snd_pcm_ops snd_rme32_capture_adat_ops = {
        .open =         snd_rme32_capture_adat_open,
        .close =        snd_rme32_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* for fullduplex mode */
-static struct snd_pcm_ops snd_rme32_playback_spdif_fd_ops = {
+static const struct snd_pcm_ops snd_rme32_playback_spdif_fd_ops = {
        .open =         snd_rme32_playback_spdif_open,
        .close =        snd_rme32_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .ack =          snd_rme32_playback_fd_ack,
 };
 
-static struct snd_pcm_ops snd_rme32_capture_spdif_fd_ops = {
+static const struct snd_pcm_ops snd_rme32_capture_spdif_fd_ops = {
        .open =         snd_rme32_capture_spdif_open,
        .close =        snd_rme32_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .ack =          snd_rme32_capture_fd_ack,
 };
 
-static struct snd_pcm_ops snd_rme32_playback_adat_fd_ops = {
+static const struct snd_pcm_ops snd_rme32_playback_adat_fd_ops = {
        .open =         snd_rme32_playback_adat_open,
        .close =        snd_rme32_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .ack =          snd_rme32_playback_fd_ack,
 };
 
-static struct snd_pcm_ops snd_rme32_capture_adat_fd_ops = {
+static const struct snd_pcm_ops snd_rme32_capture_adat_fd_ops = {
        .open =         snd_rme32_capture_adat_open,
        .close =        snd_rme32_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return snd_rme96_capture_ptr(rme96);
 }
 
-static struct snd_pcm_ops snd_rme96_playback_spdif_ops = {
+static const struct snd_pcm_ops snd_rme96_playback_spdif_ops = {
        .open =         snd_rme96_playback_spdif_open,
        .close =        snd_rme96_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme96_capture_spdif_ops = {
+static const struct snd_pcm_ops snd_rme96_capture_spdif_ops = {
        .open =         snd_rme96_capture_spdif_open,
        .close =        snd_rme96_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme96_playback_adat_ops = {
+static const struct snd_pcm_ops snd_rme96_playback_adat_ops = {
        .open =         snd_rme96_playback_adat_open,
        .close =        snd_rme96_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .mmap =         snd_pcm_lib_mmap_iomem,
 };
 
-static struct snd_pcm_ops snd_rme96_capture_adat_ops = {
+static const struct snd_pcm_ops snd_rme96_capture_adat_ops = {
        .open =         snd_rme96_capture_adat_open,
        .close =        snd_rme96_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_hdsp_playback_ops = {
+static const struct snd_pcm_ops snd_hdsp_playback_ops = {
        .open =         snd_hdsp_playback_open,
        .close =        snd_hdsp_playback_release,
        .ioctl =        snd_hdsp_ioctl,
        .silence =      snd_hdsp_hw_silence,
 };
 
-static struct snd_pcm_ops snd_hdsp_capture_ops = {
+static const struct snd_pcm_ops snd_hdsp_capture_ops = {
        .open =         snd_hdsp_capture_open,
        .close =        snd_hdsp_capture_release,
        .ioctl =        snd_hdsp_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_hdspm_ops = {
+static const struct snd_pcm_ops snd_hdspm_ops = {
        .open = snd_hdspm_open,
        .close = snd_hdspm_release,
        .ioctl = snd_hdspm_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_rme9652_playback_ops = {
+static const struct snd_pcm_ops snd_rme9652_playback_ops = {
        .open =         snd_rme9652_playback_open,
        .close =        snd_rme9652_playback_release,
        .ioctl =        snd_rme9652_ioctl,
        .silence =      snd_rme9652_hw_silence,
 };
 
-static struct snd_pcm_ops snd_rme9652_capture_ops = {
+static const struct snd_pcm_ops snd_rme9652_capture_ops = {
        .open =         snd_rme9652_capture_open,
        .close =        snd_rme9652_capture_release,
        .ioctl =        snd_rme9652_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_sonicvibes_playback_ops = {
+static const struct snd_pcm_ops snd_sonicvibes_playback_ops = {
        .open =         snd_sonicvibes_playback_open,
        .close =        snd_sonicvibes_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .pointer =      snd_sonicvibes_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_sonicvibes_capture_ops = {
+static const struct snd_pcm_ops snd_sonicvibes_capture_ops = {
        .open =         snd_sonicvibes_capture_open,
        .close =        snd_sonicvibes_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
    PCM operations
   ---------------------------------------------------------------------------*/
 
-static struct snd_pcm_ops snd_trident_playback_ops = {
+static const struct snd_pcm_ops snd_trident_playback_ops = {
        .open =         snd_trident_playback_open,
        .close =        snd_trident_playback_close,
        .ioctl =        snd_trident_ioctl,
        .pointer =      snd_trident_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_trident_nx_playback_ops = {
+static const struct snd_pcm_ops snd_trident_nx_playback_ops = {
        .open =         snd_trident_playback_open,
        .close =        snd_trident_playback_close,
        .ioctl =        snd_trident_ioctl,
        .pointer =      snd_trident_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_trident_foldback_ops = {
+static const struct snd_pcm_ops snd_trident_foldback_ops = {
        .open =         snd_trident_foldback_open,
        .close =        snd_trident_foldback_close,
        .ioctl =        snd_trident_ioctl,
        .pointer =      snd_trident_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_trident_nx_foldback_ops = {
+static const struct snd_pcm_ops snd_trident_nx_foldback_ops = {
        .open =         snd_trident_foldback_open,
        .close =        snd_trident_foldback_close,
        .ioctl =        snd_trident_ioctl,
        .page =         snd_pcm_sgbuf_ops_page,
 };
 
-static struct snd_pcm_ops snd_trident_spdif_ops = {
+static const struct snd_pcm_ops snd_trident_spdif_ops = {
        .open =         snd_trident_spdif_open,
        .close =        snd_trident_spdif_close,
        .ioctl =        snd_trident_ioctl,
        .pointer =      snd_trident_spdif_pointer,
 };
 
-static struct snd_pcm_ops snd_trident_spdif_7018_ops = {
+static const struct snd_pcm_ops snd_trident_spdif_7018_ops = {
        .open =         snd_trident_spdif_open,
        .close =        snd_trident_spdif_close,
        .ioctl =        snd_trident_ioctl,
 
 
 
 /* via686 playback callbacks */
-static struct snd_pcm_ops snd_via686_playback_ops = {
+static const struct snd_pcm_ops snd_via686_playback_ops = {
        .open =         snd_via686_playback_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* via686 capture callbacks */
-static struct snd_pcm_ops snd_via686_capture_ops = {
+static const struct snd_pcm_ops snd_via686_capture_ops = {
        .open =         snd_via82xx_capture_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* via823x DSX playback callbacks */
-static struct snd_pcm_ops snd_via8233_playback_ops = {
+static const struct snd_pcm_ops snd_via8233_playback_ops = {
        .open =         snd_via8233_playback_open,
        .close =        snd_via8233_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* via823x multi-channel playback callbacks */
-static struct snd_pcm_ops snd_via8233_multi_ops = {
+static const struct snd_pcm_ops snd_via8233_multi_ops = {
        .open =         snd_via8233_multi_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* via823x capture callbacks */
-static struct snd_pcm_ops snd_via8233_capture_ops = {
+static const struct snd_pcm_ops snd_via8233_capture_ops = {
        .open =         snd_via82xx_capture_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
 
 
 /* via686 playback callbacks */
-static struct snd_pcm_ops snd_via686_playback_ops = {
+static const struct snd_pcm_ops snd_via686_playback_ops = {
        .open =         snd_via82xx_playback_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 };
 
 /* via686 capture callbacks */
-static struct snd_pcm_ops snd_via686_capture_ops = {
+static const struct snd_pcm_ops snd_via686_capture_ops = {
        .open =         snd_via82xx_capture_open,
        .close =        snd_via82xx_pcm_close,
        .ioctl =        snd_pcm_lib_ioctl,
 
        return 0;
 }
 
-static struct snd_pcm_ops snd_ymfpci_playback_ops = {
+static const struct snd_pcm_ops snd_ymfpci_playback_ops = {
        .open =                 snd_ymfpci_playback_open,
        .close =                snd_ymfpci_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .pointer =              snd_ymfpci_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_ymfpci_capture_rec_ops = {
+static const struct snd_pcm_ops snd_ymfpci_capture_rec_ops = {
        .open =                 snd_ymfpci_capture_rec_open,
        .close =                snd_ymfpci_capture_close,
        .ioctl =                snd_pcm_lib_ioctl,
                                     snd_pcm_std_chmaps, 2, 0, NULL);
 }
 
-static struct snd_pcm_ops snd_ymfpci_capture_ac97_ops = {
+static const struct snd_pcm_ops snd_ymfpci_capture_ac97_ops = {
        .open =                 snd_ymfpci_capture_ac97_open,
        .close =                snd_ymfpci_capture_close,
        .ioctl =                snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_ymfpci_playback_spdif_ops = {
+static const struct snd_pcm_ops snd_ymfpci_playback_spdif_ops = {
        .open =                 snd_ymfpci_playback_spdif_open,
        .close =                snd_ymfpci_playback_spdif_close,
        .ioctl =                snd_pcm_lib_ioctl,
        return 0;
 }
 
-static struct snd_pcm_ops snd_ymfpci_playback_4ch_ops = {
+static const struct snd_pcm_ops snd_ymfpci_playback_4ch_ops = {
        .open =                 snd_ymfpci_playback_4ch_open,
        .close =                snd_ymfpci_playback_4ch_close,
        .ioctl =                snd_pcm_lib_ioctl,