[media] media: implement 32-on-64 bit compat IOCTL handling
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>
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 @@
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 @@
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 @@
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,
};