On Tue January 22 2013 17:27:56 Sakari Ailus wrote:
> Use the same handlers where the structs are the same. Implement a new
> handler for link enumeration since struct media_links_enum is different on
> 32-bit and 64-bit systems.
I think I would prefer to have the compat handling split off into a
seperate source. I know it is just a small amount of code at the moment,
but that's the way it is done as well for the V4L2 ioctls and I rather
like that approach.
What do others think about that?
Regards,
Hans
>
> Signed-off-by: Sakari Ailus <sakari.ai...@iki.fi>
> Acked-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> Tested-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> drivers/media/media-device.c | 102
> ++++++++++++++++++++++++++++++++++++------
> 1 file changed, 89 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index d01fcb7..99b80b6 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -20,10 +20,11 @@
> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> */
>
> -#include <linux/types.h>
> +#include <linux/compat.h>
> +#include <linux/export.h>
> #include <linux/ioctl.h>
> #include <linux/media.h>
> -#include <linux/export.h>
> +#include <linux/types.h>
>
> #include <media/media-device.h>
> #include <media/media-devnode.h>
> @@ -124,35 +125,31 @@ static void media_device_kpad_to_upad(const struct
> media_pad *kpad,
> upad->flags = kpad->flags;
> }
>
> -static long media_device_enum_links(struct media_device *mdev,
> - struct media_links_enum __user *ulinks)
> +static long __media_device_enum_links(struct media_device *mdev,
> + struct media_links_enum *links)
> {
> struct media_entity *entity;
> - struct media_links_enum links;
>
> - if (copy_from_user(&links, ulinks, sizeof(links)))
> - return -EFAULT;
> -
> - entity = find_entity(mdev, links.entity);
> + entity = find_entity(mdev, links->entity);
> if (entity == NULL)
> return -EINVAL;
>
> - if (links.pads) {
> + if (links->pads) {
> unsigned int p;
>
> for (p = 0; p < entity->num_pads; p++) {
> struct media_pad_desc pad;
> media_device_kpad_to_upad(&entity->pads[p], &pad);
> - if (copy_to_user(&links.pads[p], &pad, sizeof(pad)))
> + if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
> return -EFAULT;
> }
> }
>
> - if (links.links) {
> + if (links->links) {
> struct media_link_desc __user *ulink;
> unsigned int l;
>
> - for (l = 0, ulink = links.links; l < entity->num_links; l++) {
> + for (l = 0, ulink = links->links; l < entity->num_links; l++) {
> struct media_link_desc link;
>
> /* Ignore backlinks. */
> @@ -169,8 +166,26 @@ static long media_device_enum_links(struct media_device
> *mdev,
> ulink++;
> }
> }
> +
> + return 0;
> +}
> +
> +static long media_device_enum_links(struct media_device *mdev,
> + struct media_links_enum __user *ulinks)
> +{
> + struct media_links_enum links;
> + int rval;
> +
> + if (copy_from_user(&links, ulinks, sizeof(links)))
> + return -EFAULT;
> +
> + rval = __media_device_enum_links(mdev, &links);
> + if (rval < 0)
> + return rval;
> +
> if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
> return -EFAULT;
> +
> return 0;
> }
>
> @@ -251,10 +266,71 @@ static long media_device_ioctl(struct file *filp,
> unsigned int cmd,
> return ret;
> }
>
> +#ifdef CONFIG_COMPAT
> +
> +struct media_links_enum32 {
> + __u32 entity;
> + compat_uptr_t pads; /* struct media_pad_desc * */
> + compat_uptr_t links; /* struct media_link_desc * */
> + __u32 reserved[4];
> +};
> +
> +static long media_device_enum_links32(struct media_device *mdev,
> + struct media_links_enum32 __user *ulinks)
> +{
> + struct media_links_enum links;
> + compat_uptr_t pads_ptr, links_ptr;
> +
> + memset(&links, 0, sizeof(links));
> +
> + if (get_user(links.entity, &ulinks->entity)
> + || get_user(pads_ptr, &ulinks->pads)
> + || get_user(links_ptr, &ulinks->links))
> + return -EFAULT;
> +
> + links.pads = compat_ptr(pads_ptr);
> + links.links = compat_ptr(links_ptr);
> +
> + return __media_device_enum_links(mdev, &links);
> +}
> +
> +#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct
> media_links_enum32)
> +
> +static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
> + unsigned long arg)
> +{
> + struct media_devnode *devnode = media_devnode_data(filp);
> + struct media_device *dev = to_media_device(devnode);
> + long ret;
> +
> + switch (cmd) {
> + case MEDIA_IOC_DEVICE_INFO:
> + case MEDIA_IOC_ENUM_ENTITIES:
> + case MEDIA_IOC_SETUP_LINK:
> + return media_device_ioctl(filp, cmd, arg);
> +
> + case MEDIA_IOC_ENUM_LINKS32:
> + mutex_lock(&dev->graph_mutex);
> + ret = media_device_enum_links32(dev,
> + (struct media_links_enum32 __user *)arg);
> + mutex_unlock(&dev->graph_mutex);
> + break;
> +
> + default:
> + ret = -ENOIOCTLCMD;
> + }
> +
> + return ret;
> +}
> +#endif /* CONFIG_COMPAT */
> +
> static const struct media_file_operations media_device_fops = {
> .owner = THIS_MODULE,
> .open = media_device_open,
> .ioctl = media_device_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl = media_device_compat_ioctl,
> +#endif /* CONFIG_COMPAT */
> .release = media_device_close,
> };
>
>
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