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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>
This commit is contained in:
Clemens Ladisch 2009-03-02 12:06:28 +01:00 committed by Takashi Iwai
parent eab2b553c3
commit b1c86bb807
1 changed files with 2 additions and 3 deletions
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5
sound/usb/usbaudio.c
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@ -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;