V4L/DVB (9496): cx88-blackbird: bugfix: cx88-blackbird-mpeg-users

Allows multiple access to the mpeg device

Signed-off-by: Frederic CAND <frederic.cand@anevia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx88/cx88-blackbird.c b/drivers/media/video/cx88/cx88-blackbird.c
index ae77450..d3ae5b4 100644 (file)
--- a/drivers/media/video/cx88/cx88-blackbird.c
+++ b/drivers/media/video/cx88/cx88-blackbird.c
@@ -1078,7 +1078,7 @@ static int mpeg_open(struct inode *inode, struct file *file)
                }
        }
 
-       if (blackbird_initialize_codec(dev) < 0) {
+       if (!atomic_read(&dev->core->mpeg_users) && blackbird_initialize_codec(dev) < 0) {
                if (drv)
                        drv->request_release(drv);
                unlock_kernel();
@@ -1109,6 +1109,8 @@ static int mpeg_open(struct inode *inode, struct file *file)
                        fh->mpegq.field);
        unlock_kernel();
 
+       atomic_inc(&dev->core->mpeg_users);
+
        return 0;
 }
 
@@ -1118,7 +1120,7 @@ static int mpeg_release(struct inode *inode, struct file *file)
        struct cx8802_dev *dev = fh->dev;
        struct cx8802_driver *drv = NULL;
 
-       if (dev->mpeg_active)
+       if (dev->mpeg_active && atomic_read(&dev->core->mpeg_users) == 1)
                blackbird_stop_codec(dev);
 
        cx8802_cancel_buffers(fh->dev);
@@ -1138,6 +1140,8 @@ static int mpeg_release(struct inode *inode, struct file *file)
        if (drv)
                drv->request_release(drv);
 
+       atomic_dec(&dev->core->mpeg_users);
+
        return 0;
 }
 

diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index 76207c2..f424096 100644 (file)
--- a/drivers/media/video/cx88/cx88.h
+++ b/drivers/media/video/cx88/cx88.h
@@ -352,6 +352,7 @@ struct cx88_core {
        /* various v4l controls */
        u32                        freq;
        atomic_t                   users;
+       atomic_t                   mpeg_users;
 
        /* cx88-video needs to access cx8802 for hybrid tuner pll access. */
        struct cx8802_dev          *dvbdev;