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USB: gadget: audio driver seg-fault fix

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The included patch can be applied to the new usb gadget audio driver.

It addresses a seg-fault in uncovered in g_audio.ko.
The fault occurs in the function u_audio.c::gaudio_open_end_dev() when
device /dev/snd/pcmC0D0c (FILE_PCM_CAPTURE) is not present.

I suspect there may be similar problems with device /dev/snd/pcmC0D0p
(FILE_PCM_PLAYBACK) handling also.  I leave that for the developer(s),
as I was unsure as to the side-effects of not calling
playback_default_hw_params() in the initialization phase.

Signed-off-by: Robin Callender <robin_callender@hotmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Robin Callender 2009-08-02 11:38:58 -07:00 committed by Greg Kroah-Hartman
parent 417b57b3e4
commit e792b1b0b8
1 changed files with 6 additions and 4 deletions
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10
drivers/usb/gadget/u_audio.c
View file

@ -253,11 +253,13 @@ static int gaudio_open_snd_dev(struct gaudio *card)
snd->filp = filp_open(fn_cap, O_RDONLY, 0);
if (IS_ERR(snd->filp)) {
ERROR(card, "No such PCM capture device: %s\n", fn_cap);
snd->filp = NULL;
snd->substream = NULL;
snd->card = NULL;
} else {
pcm_file = snd->filp->private_data;
snd->substream = pcm_file->substream;
snd->card = card;
}
pcm_file = snd->filp->private_data;
snd->substream = pcm_file->substream;
snd->card = card;
return 0;
}