ALSA: dice: fix regression for Lexicon I-ONIX FW810S

For Lexicon I-ONIX FW810S, the call of ioctl(2) with
SNDRV_PCM_IOCTL_HW_PARAMS can returns -ETIMEDOUT. This is a regression due
to the commit 41319eb56e19 ("ALSA: dice: wait just for
NOTIFY_CLOCK_ACCEPTED after GLOBAL_CLOCK_SELECT operation"). The device
does not emit NOTIFY_CLOCK_ACCEPTED notification when accepting
GLOBAL_CLOCK_SELECT operation with the same parameters as current ones.

This commit fixes the regression. When receiving no notification, return
-ETIMEDOUT as long as operating for any change.

Fixes: 41319eb56e19 ("ALSA: dice: wait just for NOTIFY_CLOCK_ACCEPTED after GLOBAL_CLOCK_SELECT operation")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20221130130604.29774-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index f99e00083141ec551cfce818dcf6196ed8b94b11..4c677c8546c71a8bebc867abb423239d49906108 100644 (file)
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -59,7 +59,7 @@ int snd_dice_stream_get_rate_mode(struct snd_dice *dice, unsigned int rate,
 
 static int select_clock(struct snd_dice *dice, unsigned int rate)
 {
-       __be32 reg;
+       __be32 reg, new;
        u32 data;
        int i;
        int err;
@@ -83,15 +83,17 @@ static int select_clock(struct snd_dice *dice, unsigned int rate)
        if (completion_done(&dice->clock_accepted))
                reinit_completion(&dice->clock_accepted);
 
-       reg = cpu_to_be32(data);
+       new = cpu_to_be32(data);
        err = snd_dice_transaction_write_global(dice, GLOBAL_CLOCK_SELECT,
-                                               &reg, sizeof(reg));
+                                               &new, sizeof(new));
        if (err < 0)
                return err;
 
        if (wait_for_completion_timeout(&dice->clock_accepted,
-                       msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0)
-               return -ETIMEDOUT;
+                       msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0) {
+               if (reg != new)
+                       return -ETIMEDOUT;
+       }
 
        return 0;
 }