On Mon, Aug 25, 2008 at 03:30:13PM -0700, Steve Sakoman wrote:
> > Hmm, so the crash is actually somewhere else. Could you disable debug
> > and get the NULL pointer dereference at the right point ?
>
> The output is below. The crash seems to occur at the substream
> pointer dereference in the second line of snd_pcm_info (in
> pcm_native.c):
>
> struct snd_pcm *pcm = substream->pcm;
yeah, at that point substream was NULL. I'm trying to trace the function
call to see why substream is getting NULLed.
I think the following patch is anyway a good thing to apply:
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index c49b9d9..c7c15cf 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -92,10 +92,11 @@ static inline void snd_leave_user(mm_segment_t fs)
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info
*info)
{
struct snd_pcm_runtime *runtime;
- struct snd_pcm *pcm = substream->pcm;
+ struct snd_pcm *pcm;
struct snd_pcm_str *pstr = substream->pstr;
snd_assert(substream != NULL, return -ENXIO);
+ pcm = substream->pcm;
memset(info, 0, sizeof(*info));
info->card = pcm->card->number;
info->device = pcm->device;
--
balbi
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