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| author | Gregor Jasny <gjasny@web.de> | 2007-01-31 14:27:39 +0300 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-02-09 11:03:26 +0300 |
| commit | beb60119bcc9cbd80bc5b4f7feec419e067d3e46 (patch) | |
| tree | 06761bca06fb9e8166a002ef3e5bddd79e448d3f | |
| parent | 4147dab62d1b4387c304888488e1f67a83ad53c8 (diff) | |
| download | linux-beb60119bcc9cbd80bc5b4f7feec419e067d3e46.tar.xz | |
[ALSA] usbaudio - Fix Oops with broken usb descriptors
This is a patch for ALSA Bug #2724. Some webcams provide bogus
settings with no valid rates. With this patch those are skipped.
Signed-off-by: Gregor Jasny <gjasny@web.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
| -rw-r--r-- | sound/usb/usbaudio.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index de680d095e94..56e42b88addf 100644 --- a/sound/usb/usbaudio.c +++ b/sound/usb/usbaudio.c @@ -2463,6 +2463,7 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform * build the rate table and bitmap flags */ int r, idx, c; + unsigned int nonzero_rates = 0; /* this table corresponds to the SNDRV_PCM_RATE_XXX bit */ static unsigned int conv_rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, @@ -2485,6 +2486,7 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform fp->altsetting == 5 && fp->maxpacksize == 392) rate = 96000; fp->rate_table[r] = rate; + nonzero_rates |= rate; if (rate < fp->rate_min) fp->rate_min = rate; else if (rate > fp->rate_max) @@ -2500,6 +2502,10 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform if (!found) fp->needs_knot = 1; } + if (!nonzero_rates) { + hwc_debug("All rates were zero. Skipping format!\n"); + return -1; + } if (fp->needs_knot) fp->rates |= SNDRV_PCM_RATE_KNOT; } else { |