int ret;
 
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
        int ret;
 
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
 
        if (st->fw_version >= 0x10201) {
                if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-                       deb_info("could not acquire lock");
+                       err("could not acquire lock");
                        return 0;
                }
 
                } else {
                        /* Write request */
                        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-                               deb_info("could not acquire lock");
+                               err("could not acquire lock");
                                return 0;
                        }
                        st->buf[0] = REQUEST_NEW_I2C_WRITE;
        if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
                return -EAGAIN;
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
        int ret;
 
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
                return -EINVAL;
 
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
        }
 
        if (mutex_lock_interruptible(&adap->dev->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }
 
        int new_proto, ret;
 
        if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-               deb_info("could not acquire lock");
+               err("could not acquire lock");
                return 0;
        }