diff options
| author | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2021-12-21 11:18:43 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-01-22 09:35:33 +0100 |
| commit | 17bb9bf819c542b41d7dbddd9fe1ec82ac509604 (patch) | |
| tree | 7fe9701c1342d8b3951ad0d2f843b1fbf1d99ca5 /drivers/media/v4l2-core/v4l2-subdev.c | |
| parent | 33c0ddbe56905c98b43d7141f2fe67ae69afba3c (diff) | |
media: subdev: add v4l2_subdev_set_routing helper()
Add a helper function to set the subdev routing. The helper can be used
from subdev driver's set_routing op to store the routing table.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-subdev.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-subdev.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index dd67b4ae61d7..d95cbea1a728 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -12,6 +12,7 @@ #include <linux/ioctl.h> #include <linux/mm.h> #include <linux/module.h> +#include <linux/overflow.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/version.h> @@ -1208,6 +1209,36 @@ int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, } EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt); +int v4l2_subdev_set_routing(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + const struct v4l2_subdev_krouting *routing) +{ + struct v4l2_subdev_krouting *dst = &state->routing; + const struct v4l2_subdev_krouting *src = routing; + struct v4l2_subdev_krouting new_routing = { 0 }; + size_t bytes; + + if (unlikely(check_mul_overflow((size_t)src->num_routes, + sizeof(*src->routes), &bytes))) + return -EOVERFLOW; + + lockdep_assert_held(state->lock); + + if (src->num_routes > 0) { + new_routing.routes = kmemdup(src->routes, bytes, GFP_KERNEL); + if (!new_routing.routes) + return -ENOMEM; + } + + new_routing.num_routes = src->num_routes; + + kfree(dst->routes); + *dst = new_routing; + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_subdev_set_routing); + #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */ #endif /* CONFIG_MEDIA_CONTROLLER */ |