The len_routes field is used to tell the size of the routes array in
struct v4l2_subdev_routing. This way the number of routes returned from
S_ROUTING IOCTL may be larger than the number of routes provided, in case
there are more routes returned by the driver.
Note that this changes the (now-disabled) UAPI, users must be updated.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
.../media/v4l/vidioc-subdev-g-routing.rst | 31 ++++++++++++-------
drivers/media/v4l2-core/v4l2-ioctl.c | 4 +--
drivers/media/v4l2-core/v4l2-subdev.c | 6 +++-
include/media/v4l2-subdev.h | 2 ++
include/uapi/linux/v4l2-subdev.h | 8 +++--
5 files changed, 34 insertions(+), 17 deletions(-)
diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
index 72677a280cd6..9a9765ddc316 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
@@ -46,20 +46,26 @@ with the ``VIDIOC_SUBDEV_S_ROUTING`` ioctl, by adding or removing routes and
setting or clearing flags of the ``flags`` field of a
struct :c:type:`v4l2_subdev_route`.
-All stream configurations are reset when ``VIDIOC_SUBDEV_S_ROUTING`` is called. This
-means that the userspace must reconfigure all streams after calling the ioctl
-with e.g. ``VIDIOC_SUBDEV_S_FMT``.
+All stream configurations are reset when ``VIDIOC_SUBDEV_S_ROUTING`` is
+called. This means that the userspace must reconfigure all streams after calling
+the ioctl with e.g. ``VIDIOC_SUBDEV_S_FMT``.
Only subdevices which have both sink and source pads can support routing.
-When inspecting routes through ``VIDIOC_SUBDEV_G_ROUTING`` and the application
-provided ``num_routes`` is not big enough to contain all the available routes
-the subdevice exposes, drivers return the ENOSPC error code and adjust the
-value of the ``num_routes`` field. Application should then reserve enough memory
-for all the route entries and call ``VIDIOC_SUBDEV_G_ROUTING`` again.
+The ``num_routes`` field is used to denote the number of routes set (set by user
+space on ``VIDIOC_SUBDEV_S_ROUTING`` argument) on the routing table as well as
+the number of routes returned back from both IOCTLs. The ``len_routes``
+signifies the number of routes that can fit into the ``routes`` array. The
+userspace shall set ``len_routes`` for both IOCTLs and ``num_routes`` for
+``VIDIOC_SUBDEV_S_ROUTING``.
-On a successful ``VIDIOC_SUBDEV_G_ROUTING`` call the driver updates the
-``num_routes`` field to reflect the actual number of routes returned.
+On a ``VIDIOC_SUBDEV_G_ROUTING`` call the driver updates the ``num_routes``
+field to reflect the actual number of routes known by the driver. ``num_routes``
+larger than ``len_routes`` in both IOCTLs. In this ``len_routes`` were returned
+back to the userspace. This is not an error.
+
+Also ``VIDIOC_SUBDEV_S_ROUTING`` may return more route than the user provided in
+``num_routes`` field due to e.g. hardware properties.
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
@@ -74,6 +80,9 @@ On a successful ``VIDIOC_SUBDEV_G_ROUTING`` call the driver updates the
- ``which``
- Format to modified, from enum
:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
+ * - __u32
+ - ``len_routes``
+ - The length of the array (as in memory reserved for the array)
* - struct :c:type:`v4l2_subdev_route`
- ``routes[]``
- Array of struct :c:type:`v4l2_subdev_route` entries
@@ -81,7 +90,7 @@ On a successful ``VIDIOC_SUBDEV_G_ROUTING`` call the driver updates the
- ``num_routes``
- Number of entries of the routes array
* - __u32
- - ``reserved``\ [5]
+ - ``reserved``\ [11]
- Reserved for future extensions. Applications and drivers must set
the array to zero.
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 6921a72566df..1e3da9d64958 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -3155,13 +3155,13 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
case VIDIOC_SUBDEV_S_ROUTING: {
struct v4l2_subdev_routing *routing = parg;
- if (routing->num_routes > 256)
+ if (routing->len_routes > 256)
return -E2BIG;
*user_ptr = u64_to_user_ptr(routing->routes);
*kernel_ptr = (void **)&routing->routes;
*array_size = sizeof(struct v4l2_subdev_route)
- * routing->num_routes;
+ * routing->len_routes;
ret = 1;
break;
}
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index cb9ca08bf11c..2042ad4ef5f1 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -903,6 +903,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
if (routing->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
return -EPERM;
+ if (routing->num_routes > routing->len_routes)
+ return -EINVAL;
+
memset(routing->reserved, 0, sizeof(routing->reserved));
for (i = 0; i < routing->num_routes; ++i) {
@@ -929,6 +932,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
}
krouting.num_routes = routing->num_routes;
+ krouting.len_routes = routing->len_routes;
krouting.routes = routes;
return v4l2_subdev_call(sd, pad, set_routing, state,
@@ -949,7 +953,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
krouting = &state->routing;
- if (routing->num_routes < krouting->num_routes) {
+ if (routing->len_routes < krouting->num_routes) {
routing->num_routes = krouting->num_routes;
return -ENOSPC;
}
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 7c34243ffed9..04597dd3a6e2 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -741,12 +741,14 @@ struct v4l2_subdev_stream_configs {
/**
* struct v4l2_subdev_krouting - subdev routing table
*
+ * @len_routes: length of routes array, in routes
* @num_routes: number of routes
* @routes: &struct v4l2_subdev_route
*
* This structure contains the routing table for a subdev.
*/
struct v4l2_subdev_krouting {
+ unsigned int len_routes;
unsigned int num_routes;
struct v4l2_subdev_route *routes;
};
diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index 4a195b68f28f..b57fb89caa9e 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -222,15 +222,17 @@ struct v4l2_subdev_route {
* struct v4l2_subdev_routing - Subdev routing information
*
* @which: configuration type (from enum v4l2_subdev_format_whence)
- * @num_routes: the total number of routes in the routes array
+ * @len_routes: the length of the routes array, in routes
* @routes: pointer to the routes array
+ * @num_routes: the total number of routes in the routes array
* @reserved: drivers and applications must zero this array
*/
struct v4l2_subdev_routing {
__u32 which;
- __u32 num_routes;
+ __u32 len_routes;
__u64 routes;
- __u32 reserved[6];
+ __u32 num_routes;
+ __u32 reserved[11];
};
/*
--
2.39.2
