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[media] media: Add flags to tell whether to take graph mutex for an IOCTL

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New IOCTLs (especially for the request API) do not necessarily need the
graph mutex acquired. Leave this up to the drivers.

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>
This commit is contained in:
Sakari Ailus 2016-04-27 10:15:52 -03:00 committed by Mauro Carvalho Chehab
parent bcd5081b05
commit 7d4b64028c
1 changed files with 23 additions and 14 deletions
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37
drivers/media/media-device.c
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@ -381,31 +381,36 @@ static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
return 0;
}
#define MEDIA_IOC_ARG(__cmd, func, from_user, to_user) \
[_IOC_NR(MEDIA_IOC_##__cmd)] = { \
.cmd = MEDIA_IOC_##__cmd, \
/* Do acquire the graph mutex */
#define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
[_IOC_NR(MEDIA_IOC_##__cmd)] = { \
.cmd = MEDIA_IOC_##__cmd, \
.fn = (long (*)(struct media_device *, void *))func, \
.arg_from_user = from_user, \
.arg_to_user = to_user, \
.flags = fl, \
.arg_from_user = from_user, \
.arg_to_user = to_user, \
}
#define MEDIA_IOC(__cmd, func) \
MEDIA_IOC_ARG(__cmd, func, copy_arg_from_user, copy_arg_to_user)
#define MEDIA_IOC(__cmd, func, fl) \
MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
/* the table is indexed by _IOC_NR(cmd) */
struct media_ioctl_info {
unsigned int cmd;
unsigned short flags;
long (*fn)(struct media_device *dev, void *arg);
long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
};
static const struct media_ioctl_info ioctl_info[] = {
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),
MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
};
static long media_device_ioctl(struct file *filp, unsigned int cmd,
@ -436,9 +441,13 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd,
goto out_free;
}
mutex_lock(&dev->graph_mutex);
if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
mutex_lock(&dev->graph_mutex);
ret = info->fn(dev, karg);
mutex_unlock(&dev->graph_mutex);
if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
mutex_unlock(&dev->graph_mutex);
if (!ret && info->arg_to_user)
ret = info->arg_to_user(arg, karg, cmd);