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Commit 765e8db0 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
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sound: usb-audio: do not make URBs longer than sync packet interval 



Using more packets in one URB do avoid interrupts does not make sense
when we have a sync pipe whose packets generate interrupts more often.
Therefore, limit the URB size to the synchronization packet interval.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent a65dd997

sound/usb/usbaudio.c

+2 −0
Original line number Diff line number Diff line
@@ -1083,6 +1083,8 @@ static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int peri 
	} else

		urb_packs = 1;

	urb_packs *= packs_per_ms;

	if (subs->syncpipe)

		urb_packs = min(urb_packs, 1 << subs->syncinterval);



	/* decide how many packets to be used */

	if (is_playback) {