diff options
| author | Devin Heitmueller <dheitmueller@linuxtv.org> | 2009-03-11 03:00:45 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:43:25 -0300 |
| commit | 4ff5ed44f84aed6727ec226853a1c6b03c36db5e (patch) | |
| tree | dd4a2fa3338710215a114aa147177209efc26cac | |
| parent | 7fdd7c72ad65ef98d1071cf4cd8a39490f423bae (diff) | |
V4L/DVB (11069): au8522: add mutex protecting use of hybrid state
Access using the hybrid state framework requires the list to be protected by
a mutex.
Thanks to Michael Krufky <mkrufky@linuxtv.org> for reporting this during a
code review.
Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/dvb/frontends/au8522_dig.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/au8522_dig.c b/drivers/media/dvb/frontends/au8522_dig.c index b04346687c6..7e24b914dbe 100644 --- a/drivers/media/dvb/frontends/au8522_dig.c +++ b/drivers/media/dvb/frontends/au8522_dig.c @@ -34,6 +34,7 @@ static int debug; /* Despite the name "hybrid_tuner", the framework works just as well for hybrid demodulators as well... */ static LIST_HEAD(hybrid_tuner_instance_list); +static DEFINE_MUTEX(au8522_list_mutex); #define dprintk(arg...) do { \ if (debug) \ @@ -795,15 +796,23 @@ static struct dvb_frontend_ops au8522_ops; int au8522_get_state(struct au8522_state **state, struct i2c_adapter *i2c, u8 client_address) { - return hybrid_tuner_request_state(struct au8522_state, (*state), - hybrid_tuner_instance_list, - i2c, client_address, "au8522"); + int ret; + + mutex_lock(&au8522_list_mutex); + ret = hybrid_tuner_request_state(struct au8522_state, (*state), + hybrid_tuner_instance_list, + i2c, client_address, "au8522"); + mutex_unlock(&au8522_list_mutex); + + return ret; } void au8522_release_state(struct au8522_state *state) { + mutex_lock(&au8522_list_mutex); if (state != NULL) hybrid_tuner_release_state(state); + mutex_unlock(&au8522_list_mutex); } |