diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2012-11-24 21:35:48 -0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-03-06 03:22:35 +0000 |
| commit | 754aed1b98d1c1ed2a8eaae2fc933bc9c6a87629 (patch) | |
| tree | 2195326e379050dde1537e55f823d86ee1577255 /drivers/media | |
| parent | 4e392406854be9807fbd51e626ec74530655e8a4 (diff) | |
v4l: Reset subdev v4l2_dev field to NULL if registration fails
commit 317efce991620adc589b3005b9baed433dcb2a56 upstream.
When subdev registration fails the subdev v4l2_dev field is left to a
non-NULL value. Later calls to v4l2_device_unregister_subdev() will
consider the subdev as registered and will module_put() the subdev
module without any matching module_get().
Fix this by setting the subdev v4l2_dev field to NULL in
v4l2_device_register_subdev() when the function fails.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
[bwh: Backported to 3.2: adjust context, filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/video/v4l2-device.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c index 0edd618b9ddf..8b0777f6abf6 100644 --- a/drivers/media/video/v4l2-device.c +++ b/drivers/media/video/v4l2-device.c @@ -159,31 +159,21 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, sd->v4l2_dev = v4l2_dev; if (sd->internal_ops && sd->internal_ops->registered) { err = sd->internal_ops->registered(sd); - if (err) { - module_put(sd->owner); - return err; - } + if (err) + goto error_module; } /* This just returns 0 if either of the two args is NULL */ err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler); - if (err) { - if (sd->internal_ops && sd->internal_ops->unregistered) - sd->internal_ops->unregistered(sd); - module_put(sd->owner); - return err; - } + if (err) + goto error_unregister; #if defined(CONFIG_MEDIA_CONTROLLER) /* Register the entity. */ if (v4l2_dev->mdev) { err = media_device_register_entity(v4l2_dev->mdev, entity); - if (err < 0) { - if (sd->internal_ops && sd->internal_ops->unregistered) - sd->internal_ops->unregistered(sd); - module_put(sd->owner); - return err; - } + if (err < 0) + goto error_unregister; } #endif @@ -192,6 +182,14 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, spin_unlock(&v4l2_dev->lock); return 0; + +error_unregister: + if (sd->internal_ops && sd->internal_ops->unregistered) + sd->internal_ops->unregistered(sd); +error_module: + module_put(sd->owner); + sd->v4l2_dev = NULL; + return err; } EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); |