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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-05-11 10:47:30 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-05-11 14:51:09 +0200 |
| commit | 03c29680d49662859d14d64f8673550fa3fb2ed1 (patch) | |
| tree | 0b072dfc7de12605bfa3106c45566b7cc98462fb /sound/firewire/isight.c | |
| parent | 3a691b28a0ca3cf4d9010c6158318159e0275d2c (diff) | |
| download | lwn-03c29680d49662859d14d64f8673550fa3fb2ed1.tar.gz lwn-03c29680d49662859d14d64f8673550fa3fb2ed1.zip | |
ALSA: isight: fix isight_pcm_abort() crashes
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>
Diffstat (limited to 'sound/firewire/isight.c')
| -rw-r--r-- | sound/firewire/isight.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c index a6f19f57a1c3..0230605c917e 100644 --- a/sound/firewire/isight.c +++ b/sound/firewire/isight.c @@ -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; @@ -131,10 +132,12 @@ static void isight_pcm_abort(struct isight *isight) { unsigned long flags; - 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); + 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, - params_buffer_bytes(hw_params)); + 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); |