On 08/19/2016 12:23 PM, Sakari Ailus wrote:
> The release callback may be used by the driver to signal the release of
> the media device. This makes it possible to embed a driver private struct
> to the same memory allocation.
This is a bit weird: you either add support for private data with a priv
pointer as in the previous patch, or you allow for larger structs.
Doing both doesn't seem right. In both cases you want the release callback,
so that's fine. But I think you should pick which method you want to keep
private data around.
I have a slight preference for a priv pointer, but I'm OK with either solution.
Regards,
Hans
>
> Signed-off-by: Sakari Ailus <[email protected]>
> ---
> drivers/media/media-device.c | 11 ++++++++++-
> include/media/media-device.h | 8 +++++++-
> 2 files changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 27d5214..7f90cb82 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -552,6 +552,9 @@ static void media_device_release(struct media_devnode
> *devnode)
> mutex_destroy(&mdev->graph_mutex);
> dev_dbg(devnode->parent, "Media device released\n");
>
> + if (mdev->release)
> + mdev->release(mdev);
> +
> kfree(mdev);
> }
>
> @@ -699,10 +702,16 @@ void media_device_init(struct media_device *mdev)
> }
> EXPORT_SYMBOL_GPL(media_device_init);
>
> -struct media_device *media_device_alloc(struct device *dev, void *priv)
> +struct media_device *media_device_alloc(struct device *dev, void *priv,
> + size_t size)
> {
> struct media_device *mdev;
>
> + if (!size)
> + size = sizeof(*mdev);
> + else if (WARN_ON(size < sizeof(*mdev)))
> + return NULL;
> +
> dev = get_device(dev);
> if (!dev)
> return NULL;
> diff --git a/include/media/media-device.h b/include/media/media-device.h
> index cfcec1b..3b66232 100644
> --- a/include/media/media-device.h
> +++ b/include/media/media-device.h
> @@ -152,6 +152,7 @@ struct media_device {
>
> int (*link_notify)(struct media_link *link, u32 flags,
> unsigned int notification);
> + void (*release)(struct media_device *mdev);
> };
>
> /* We don't need to include pci.h or usb.h here */
> @@ -203,15 +204,20 @@ void media_device_init(struct media_device *mdev);
> *
> * @dev: The associated struct device pointer
> * @priv: pointer to a driver private data structure
> + * @size: size of a driver structure containing the media device
> *
> * Allocate and initialise a media device. Returns a media device.
> * The media device is refcounted, and this function returns a media
> * device the refcount of which is one (1).
> *
> + * The size parameter can be zero if the media_device is not embedded
> + * in another struct.
> + *
> * References are taken and given using media_device_get() and
> * media_device_put().
> */
> -struct media_device *media_device_alloc(struct device *dev, void *priv);
> +struct media_device *media_device_alloc(struct device *dev, void *priv,
> + size_t size);
>
> /**
> * media_device_get() - Get a reference to a media device
>
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