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authorHans Verkuil <hverkuil@xs4all.nl>2009-03-14 14:28:45 +0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-03-30 19:43:22 +0400
commitae6cfaace120f4330715b56265ce0e4a710e1276 (patch)
treeed01c11218132e92ce8fe4872fe26c572c3c8842 /drivers/media/video/v4l2-device.c
parent6273fda6e32e2cd9a478545d0cbc15ac497b1f4b (diff)
downloadlinux-ae6cfaace120f4330715b56265ce0e4a710e1276.tar.xz
V4L/DVB (11044): v4l2-device: add v4l2_device_disconnect
Call v4l2_device_disconnect when the parent of a hotpluggable device disconnects. This ensures that you do not have a pointer to a device that is no longer present. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/v4l2-device.c')
-rw-r--r--drivers/media/video/v4l2-device.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c
index b3dcb8454379..94aa485ade52 100644
--- a/drivers/media/video/v4l2-device.c
+++ b/drivers/media/video/v4l2-device.c
@@ -49,19 +49,26 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
}
EXPORT_SYMBOL_GPL(v4l2_device_register);
+void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
+{
+ if (v4l2_dev->dev) {
+ dev_set_drvdata(v4l2_dev->dev, NULL);
+ v4l2_dev->dev = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
+
void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
{
struct v4l2_subdev *sd, *next;
if (v4l2_dev == NULL)
return;
- if (v4l2_dev->dev)
- dev_set_drvdata(v4l2_dev->dev, NULL);
+ v4l2_device_disconnect(v4l2_dev);
+
/* Unregister subdevs */
list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list)
v4l2_device_unregister_subdev(sd);
-
- v4l2_dev->dev = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister);