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Subject: [media] media: Unify IOCTL handler calling
Author:  Sakari Ailus <sakari.ai...@linux.intel.com>
Date:    Tue May 3 18:35:12 2016 -0300

Each IOCTL handler can be listed in an array instead of using a large and
cumbersome switch. Do that.

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 | 51 +++++++++++++-------------------------------
 1 file changed, 15 insertions(+), 36 deletions(-)

---

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index f3212640858b..4ac912b60f85 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -419,20 +419,24 @@ 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 }
+#define MEDIA_IOC(__cmd, func)                                         \
+       [_IOC_NR(MEDIA_IOC_##__cmd)] = {                                \
+               .cmd = MEDIA_IOC_##__cmd,                               \
+               .fn = (long (*)(struct media_device *, void __user *))func,    \
+       }
 
 /* the table is indexed by _IOC_NR(cmd) */
 struct media_ioctl_info {
        unsigned int cmd;
+       long (*fn)(struct media_device *dev, void __user *arg);
 };
 
 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),
+       MEDIA_IOC(DEVICE_INFO, media_device_get_info),
+       MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities),
+       MEDIA_IOC(ENUM_LINKS, media_device_enum_links),
+       MEDIA_IOC(SETUP_LINK, media_device_setup_link),
+       MEDIA_IOC(G_TOPOLOGY, media_device_get_topology),
 };
 
 static long media_device_ioctl(struct file *filp, unsigned int cmd,
@@ -440,42 +444,17 @@ static long media_device_ioctl(struct file *filp, 
unsigned int cmd,
 {
        struct media_devnode *devnode = media_devnode_data(filp);
        struct media_device *dev = devnode->media_dev;
+       const struct media_ioctl_info *info;
        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:
-               ret = media_device_get_info(dev,
-                               (struct media_device_info __user *)arg);
-               break;
-
-       case MEDIA_IOC_ENUM_ENTITIES:
-               ret = media_device_enum_entities(dev,
-                               (struct media_entity_desc __user *)arg);
-               break;
-
-       case MEDIA_IOC_ENUM_LINKS:
-               ret = media_device_enum_links(dev,
-                               (struct media_links_enum __user *)arg);
-               break;
+       info = &ioctl_info[_IOC_NR(cmd)];
 
-       case MEDIA_IOC_SETUP_LINK:
-               ret = media_device_setup_link(dev,
-                               (struct media_link_desc __user *)arg);
-               break;
-
-       case MEDIA_IOC_G_TOPOLOGY:
-               ret = media_device_get_topology(dev,
-                               (struct media_v2_topology __user *)arg);
-               break;
-
-       default:
-               ret = -ENOIOCTLCMD;
-       }
+       mutex_lock(&dev->graph_mutex);
+       ret = info->fn(dev, (void __user *)arg);
        mutex_unlock(&dev->graph_mutex);
 
        return ret;

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