sound: usb-audio: fix queue length check for high speed devices

When checking for the maximum queue length, we have to take into account
that MAX_QUEUE is measured in milliseconds (i.e., frames) while the unit
of urb_packs is whatever data packet interval the device uses (possibly
less than one frame when using high speed devices).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 3 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index f853b627cf43..defe9913cbb2 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1095,9 +1095,8 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri
                         total_packs = 2 * packs_per_ms;
                 } else {
                         /* and we don't want too long a queue either */
-                        maxpacks = max((unsigned int)MAX_QUEUE, urb_packs * 2);
-                        if (total_packs > maxpacks * packs_per_ms)
-                                total_packs = maxpacks * packs_per_ms;
+                        maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
+                        total_packs = min(total_packs, maxpacks);
                 }
         } else {
                 total_packs = MAX_URBS * urb_packs;