diff options
| author | Chris Pascoe <c.pascoe@itee.uq.edu.au> | 2007-11-19 04:45:38 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-01-25 19:02:24 -0200 |
| commit | aa501be989f5df58c4732d5eb1989e5ca6479d90 (patch) | |
| tree | 45f79c5b2d9c2462234c5c3b180572a84b3e5ef2 /drivers/media/video/tuner-xc2028.c | |
| parent | 91240dd92474d4124f80b00e6200052b275a99a1 (diff) | |
V4L/DVB (6636): xc2028: protect device list
Protect refcount changes and modifications to xc2028_list with a mutex.
Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/tuner-xc2028.c')
| -rw-r--r-- | drivers/media/video/tuner-xc2028.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/media/video/tuner-xc2028.c b/drivers/media/video/tuner-xc2028.c index a01231a0410..ac7f3e1d32f 100644 --- a/drivers/media/video/tuner-xc2028.c +++ b/drivers/media/video/tuner-xc2028.c @@ -44,6 +44,8 @@ MODULE_PARM_DESC(audio_std, "NICAM/B\n"); static LIST_HEAD(xc2028_list); +static DEFINE_MUTEX(xc2028_list_mutex); + /* struct for storing firmware table */ struct firmware_description { unsigned int type; @@ -854,6 +856,8 @@ static int xc2028_dvb_release(struct dvb_frontend *fe) tuner_dbg("%s called\n", __FUNCTION__); + mutex_lock(&xc2028_list_mutex); + priv->count--; if (!priv->count) { @@ -865,6 +869,8 @@ static int xc2028_dvb_release(struct dvb_frontend *fe) kfree(priv); } + mutex_unlock(&xc2028_list_mutex); + return 0; } @@ -940,6 +946,8 @@ void *xc2028_attach(struct dvb_frontend *fe, struct xc2028_config *cfg) video_dev = cfg->video_dev; + mutex_lock(&xc2028_list_mutex); + list_for_each_entry(priv, &xc2028_list, xc2028_list) { if (priv->video_dev == cfg->video_dev) { video_dev = NULL; @@ -949,8 +957,10 @@ void *xc2028_attach(struct dvb_frontend *fe, struct xc2028_config *cfg) if (video_dev) { priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (priv == NULL) + if (priv == NULL) { + mutex_unlock(&xc2028_list_mutex); return NULL; + } priv->bandwidth = BANDWIDTH_6_MHZ; priv->need_load_generic = 1; @@ -974,6 +984,8 @@ void *xc2028_attach(struct dvb_frontend *fe, struct xc2028_config *cfg) tuner_info("type set to %s\n", "XCeive xc2028/xc3028 tuner"); + mutex_unlock(&xc2028_list_mutex); + return fe; } |