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a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 X-LSpam-Score: -2.6 (--) X-LSpam-Report: No, score=-2.6 required=5.0 tests=ARC_SIGNED=0.001,ARC_VALID=-0.1,BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,DMARC_MISSING=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1,RCVD_IN_DNSWL_NONE=-0.0001,SPF_HELO_NONE=0.001,SPF_PASS=-0.001 autolearn=ham autolearn_force=no Add some checks to verify that the subdev driver implements required features. A subdevice that supports streams (V4L2_SUBDEV_FL_STREAMS) must do one of the following: - Implement neither .enable/disable_streams() nor .s_stream(), if the subdev is part of a video driver that uses an internal method to enable the subdev. - Implement only .enable/disable_streams(), if support for legacy sink-side subdevices is not needed. - Implement .enable/disable_streams() and .s_stream(), if support for legacy sink-side subdevices is needed. At the moment the framework doesn't check this requirement. Add the check. Signed-off-by: Tomi Valkeinen --- drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 4c6198c48dd6..b90b5185e87f 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -1519,6 +1519,33 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name, struct lock_class_key *key) { struct v4l2_subdev_state *state; + struct device *dev = sd->dev; + bool has_disable_streams; + bool has_enable_streams; + bool has_s_stream; + + /* Check that the subdevice implements the required features */ + + has_s_stream = sd->ops && sd->ops->video && sd->ops->video->s_stream; + has_enable_streams = sd->ops && sd->ops->pad && sd->ops->pad->enable_streams; + has_disable_streams = sd->ops && sd->ops->pad && sd->ops->pad->disable_streams; + + if (has_enable_streams != has_disable_streams) { + dev_err(dev, + "subdev '%s' must implement both or neither of .enable_streams() and .disable_streams()\n", + sd->name); + return -EINVAL; + } + + if (sd->flags & V4L2_SUBDEV_FL_STREAMS) { + if (has_s_stream && !has_enable_streams) { + dev_err(dev, + "subdev '%s' must implement .enable/disable_streams()\n", + sd->name); + + return -EINVAL; + } + } state = __v4l2_subdev_state_alloc(sd, name, key); if (IS_ERR(state))