aboutsummaryrefslogtreecommitdiff
path: root/sound/firewire
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2011-05-11 10:47:30 +0200
committerTakashi Iwai <tiwai@suse.de>2011-05-11 14:51:09 +0200
commit03c29680d49662859d14d64f8673550fa3fb2ed1 (patch)
tree0b072dfc7de12605bfa3106c45566b7cc98462fb /sound/firewire
parent3a691b28a0ca3cf4d9010c6158318159e0275d2c (diff)
downloadlinux-03c29680d49662859d14d64f8673550fa3fb2ed1.tar.gz
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')
-rw-r--r--sound/firewire/isight.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index a6f19f57a1c..0230605c917 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);