V4L/DVB (8613): v4l: move BKL down to the driver level.

The BKL is now moved from the video_open function in v4l2-dev.c to the
various drivers. It seems about a third of the drivers already has a
lock of some sort protecting the open(), another third uses
video_exclusive_open (yuck!) and the last third required adding the
BKL in their open function.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index 933eaef41ead..c3526d0258f8 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -3227,6 +3227,7 @@ static int bttv_open(struct inode *inode, struct file *file)
 
         dprintk(KERN_DEBUG "bttv: open minor=%d\n",minor);
 
+        lock_kernel();
         for (i = 0; i < bttv_num; i++) {
                 if (bttvs[i].video_dev &&
                     bttvs[i].video_dev->minor == minor) {
@@ -3241,16 +3242,20 @@ static int bttv_open(struct inode *inode, struct file *file)
                         break;
                 }
         }
-        if (NULL == btv)
+        if (NULL == btv) {
+                unlock_kernel();
                 return -ENODEV;
+        }
 
         dprintk(KERN_DEBUG "bttv%d: open called (type=%s)\n",
                 btv->c.nr,v4l2_type_names[type]);
 
         /* allocate per filehandle data */
         fh = kmalloc(sizeof(*fh),GFP_KERNEL);
-        if (NULL == fh)
+        if (NULL == fh) {
+                unlock_kernel();
                 return -ENOMEM;
+        }
         file->private_data = fh;
         *fh = btv->init;
         fh->type = type;
@@ -3290,6 +3295,7 @@ static int bttv_open(struct inode *inode, struct file *file)
         bttv_vbi_fmt_reset(&fh->vbi_fmt, btv->tvnorm);
 
         bttv_field_count(btv);
+        unlock_kernel();
         return 0;
 }
 
@@ -3430,21 +3436,26 @@ static int radio_open(struct inode *inode, struct file *file)
 
         dprintk("bttv: open minor=%d\n",minor);
 
+        lock_kernel();
         for (i = 0; i < bttv_num; i++) {
                 if (bttvs[i].radio_dev && bttvs[i].radio_dev->minor == minor) {
                         btv = &bttvs[i];
                         break;
                 }
         }
-        if (NULL == btv)
+        if (NULL == btv) {
+                unlock_kernel();
                 return -ENODEV;
+        }
 
         dprintk("bttv%d: open called (radio)\n",btv->c.nr);
 
         /* allocate per filehandle data */
         fh = kmalloc(sizeof(*fh), GFP_KERNEL);
-        if (NULL == fh)
+        if (NULL == fh) {
+                unlock_kernel();
                 return -ENOMEM;
+        }
         file->private_data = fh;
         *fh = btv->init;
         v4l2_prio_open(&btv->prio, &fh->prio);
@@ -3457,6 +3468,7 @@ static int radio_open(struct inode *inode, struct file *file)
         audio_input(btv,TVAUDIO_INPUT_RADIO);
 
         mutex_unlock(&btv->lock);
+        unlock_kernel();
         return 0;
 }