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ALSA: isight: fix isight_pcm_abort() crashes

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Fix crashes in isight_pcm_abort() that happen when the driver tries to
access isight->pcm->runtime which does not exist when the device is not
open.  Introduce a new field pcm_active to track this state.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2011-05-11 10:47:30 +02:00 committed by Takashi Iwai
parent 3a691b28a0
commit 03c29680d4
1 changed files with 20 additions and 6 deletions
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16
sound/firewire/isight.c
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@ -56,6 +56,7 @@ struct isight {
struct iso_packets_buffer buffer;
struct fw_iso_resources resources;
struct fw_iso_context *context;
bool pcm_active;
bool pcm_running;
bool first_packet;
int packet_index;
@ -131,11 +132,13 @@ static void isight_pcm_abort(struct isight *isight)
{
unsigned long flags;
if (ACCESS_ONCE(isight->pcm_active)) {
snd_pcm_stream_lock_irqsave(isight->pcm, flags);
if (snd_pcm_running(isight->pcm))
snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
}
}
static void isight_dropped_samples(struct isight *isight, unsigned int total)
{
@ -295,8 +298,17 @@ static int isight_close(struct snd_pcm_substream *substream)
static int isight_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
struct isight *isight = substream->private_data;
int err;
err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
ACCESS_ONCE(isight->pcm_active) = true;
return 0;
}
static void isight_stop_streaming(struct isight *isight)
@ -322,6 +334,8 @@ static int isight_hw_free(struct snd_pcm_substream *substream)
{
struct isight *isight = substream->private_data;
ACCESS_ONCE(isight->pcm_active) = false;
mutex_lock(&isight->mutex);
isight_stop_streaming(isight);
mutex_unlock(&isight->mutex);