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authorClemens Ladisch <clemens@ladisch.de>2009-03-02 06:06:28 -0500
committerTakashi Iwai <tiwai@suse.de>2009-03-02 08:50:01 -0500
commitb1c86bb807448701400abc6eb8e958475ab5424b (patch)
tree7673a17d82c20f5bc1824c17bc2cb1a0c05004ea /sound/usb/usbaudio.c
parenteab2b553c3d3ed20698c4a9c7e049a60b804e2f5 (diff)
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>
Diffstat (limited to 'sound/usb/usbaudio.c')
-rw-r--r--sound/usb/usbaudio.c5
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
1095 total_packs = 2 * packs_per_ms; 1095 total_packs = 2 * packs_per_ms;
1096 } else { 1096 } else {
1097 /* and we don't want too long a queue either */ 1097 /* and we don't want too long a queue either */
1098 maxpacks = max((unsigned int)MAX_QUEUE, urb_packs * 2); 1098 maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
1099 if (total_packs > maxpacks * packs_per_ms) 1099 total_packs = min(total_packs, maxpacks);
1100 total_packs = maxpacks * packs_per_ms;
1101 } 1100 }
1102 } else { 1101 } else {
1103 total_packs = MAX_URBS * urb_packs; 1102 total_packs = MAX_URBS * urb_packs;