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Subject: [media] media: Determine early whether an IOCTL is supported
Author:  Sakari Ailus <sakari.ai...@linux.intel.com>
Date:    Wed Apr 27 09:39:17 2016 -0300

Preparation for refactoring media IOCTL handling to unify common parts.

Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/media-device.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

---

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:

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