From eab2b553c3d3ed20698c4a9c7e049a60b804e2f5 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Mon, 2 Mar 2009 11:45:50 +0100 Subject: [PATCH] sound: usb-audio: fix rules check for 32-channel devices When storing the channel numbers used by a format, and if the device happens to support 32 channels, the code would try to store 1<<32 in a 32-bit value. Since no valid format can have zero channels, we can use 1<<(channels-1) instead of 1< Signed-off-by: Takashi Iwai --- sound/usb/usbaudio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 2b24496ddec7..f853b627cf43 100644 --- a/sound/usb/usbaudio.c +++ b/sound/usb/usbaudio.c @@ -1783,7 +1783,7 @@ static int check_hw_params_convention(struct snd_usb_substream *subs) if (rates[f->format] && rates[f->format] != f->rates) goto __out; } - channels[f->format] |= (1 << f->channels); + channels[f->format] |= 1 << (f->channels - 1); rates[f->format] |= f->rates; /* needs knot? */ if (f->rates & SNDRV_PCM_RATE_KNOT) @@ -1810,7 +1810,7 @@ static int check_hw_params_convention(struct snd_usb_substream *subs) continue; for (i = 0; i < 32; i++) { if (f->rates & (1 << i)) - channels[i] |= (1 << f->channels); + channels[i] |= 1 << (f->channels - 1); } } cmaster = 0; -- 2.39.5