[PATCH 5.15 009/207] ALSA: usb-audio: Fix packet size calculation regression

[Greg Kroah-Hartman]

From: Takashi Iwai <tiwai@xxxxxxx>

commit 23939115be181bc5dbc33aa8471adcdbffa28910 upstream.

The commit d215f63d49da ("ALSA: usb-audio: Check available frames for
the next packet size") introduced the available frame size check, but
the conversion forgot to initialize the temporary variable properly,
and it resulted in a bogus calculation.  This patch fixes it.

Fixes: d215f63d49da ("ALSA: usb-audio: Check available frames for the next packet size")
Reported-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211001104417.14291-1-colin.king@xxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20211001105425.16191-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 sound/usb/endpoint.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -182,7 +182,7 @@ static int next_packet_size(struct snd_u
 	if (ep->fill_max)
 		return ep->maxframesize;
 
-	sample_accum += ep->sample_rem;
+	sample_accum = ep->sample_accum + ep->sample_rem;
 	if (sample_accum >= ep->pps) {
 		sample_accum -= ep->pps;
 		ret = ep->packsize[1];