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[media] media: implement 32-on-64 bit compat IOCTL handling

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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.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus 2013-01-22 12:27:56 -03:00 committed by Mauro Carvalho Chehab
parent c6c1d50b51
commit b0a1f2a842
1 changed files with 89 additions and 13 deletions
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102
drivers/media/media-device.c
View file

@ -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,
};