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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2016-04-27 15:39:17 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-09-22 16:22:15 +0300 |
| commit | cf439d5f4d609b296cabf9a896fcf571b57e260b (patch) | |
| tree | 075557ee70809e2a734f8bceac8d32357663e258 /drivers/media/media-device.c | |
| parent | 2950da489520ed66da0934d04ebeb32054263e12 (diff) | |
| download | linux-cf439d5f4d609b296cabf9a896fcf571b57e260b.tar.xz | |
[media] media: Determine early whether an IOCTL is supported
Preparation for refactoring media IOCTL handling to unify common parts.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/media-device.c')
| -rw-r--r-- | drivers/media/media-device.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index 1795abeda658..f3212640858b 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -419,6 +419,22 @@ static long media_device_get_topology(struct media_device *mdev, return 0; } +#define MEDIA_IOC(__cmd) \ + [_IOC_NR(MEDIA_IOC_##__cmd)] = { .cmd = MEDIA_IOC_##__cmd } + +/* the table is indexed by _IOC_NR(cmd) */ +struct media_ioctl_info { + unsigned int cmd; +}; + +static const struct media_ioctl_info ioctl_info[] = { + MEDIA_IOC(DEVICE_INFO), + MEDIA_IOC(ENUM_ENTITIES), + MEDIA_IOC(ENUM_LINKS), + MEDIA_IOC(SETUP_LINK), + MEDIA_IOC(G_TOPOLOGY), +}; + static long media_device_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { @@ -426,6 +442,10 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd, struct media_device *dev = devnode->media_dev; long ret; + if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info) + || ioctl_info[_IOC_NR(cmd)].cmd != cmd) + return -ENOIOCTLCMD; + mutex_lock(&dev->graph_mutex); switch (cmd) { case MEDIA_IOC_DEVICE_INFO: |