Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=aa501be989f5df58c4732d5eb1989e5ca6479d90
Commit: aa501be989f5df58c4732d5eb1989e5ca6479d90
Parent: 91240dd92474d4124f80b00e6200052b275a99a1
Author: Chris Pascoe <[EMAIL PROTECTED]>
AuthorDate: Mon Nov 19 04:45:38 2007 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 19:02:24 2008 -0200
V4L/DVB (6636): xc2028: protect device list
Protect refcount changes and modifications to xc2028_list with a mutex.
Signed-off-by: Chris Pascoe <[EMAIL PROTECTED]>
Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
---
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 a01231a..ac7f3e1 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;
}
-
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