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Subject: media: v4l: subdev: Also return pads array information on stream
functions
Author: Sakari Ailus <sakari.ai...@linux.intel.com>
Date: Fri Oct 13 09:31:37 2023 +0200
There are two sets of functions that return information from sub-device
state, one for stream-unaware users and another for stream-aware users.
Add support for stream-aware functions to return format, crop and compose
information from pad-based array that are functionally equivalent to the
old, stream-unaware ones.
Also check state is non-NULL, in order to guard against old drivers
potentially calling this with NULL state for active formats or selection
rectangles.
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkei...@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>
drivers/media/v4l2-core/v4l2-subdev.c | 63 +++++++++++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 9 +++--
2 files changed, 69 insertions(+), 3 deletions(-)
---
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c
b/drivers/media/v4l2-core/v4l2-subdev.c
index cd3ff5b19d0c..554d0c128ee9 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1691,6 +1691,27 @@ v4l2_subdev_state_get_stream_format(struct
v4l2_subdev_state *state,
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
+ if (WARN_ON_ONCE(!state))
+ return NULL;
+
+ if (state->pads) {
+ if (stream)
+ return NULL;
+
+ /*
+ * Set the pad to 0 on error as this is aligned with the
+ * behaviour of the pad state information access functions. The
+ * purpose of setting pad to 0 here is to avoid accessing memory
+ * outside the pads array, but still issuing warning of the
+ * invalid access while making the caller's error handling
+ * easier.
+ */
+ if (WARN_ON_ONCE(pad >= state->sd->entity.num_pads))
+ pad = 0;
+
+ return &state->pads[pad].format;
+ }
+
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
@@ -1712,6 +1733,27 @@ v4l2_subdev_state_get_stream_crop(struct
v4l2_subdev_state *state,
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
+ if (WARN_ON_ONCE(!state))
+ return NULL;
+
+ if (state->pads) {
+ if (stream)
+ return NULL;
+
+ /*
+ * Set the pad to 0 on error as this is aligned with the
+ * behaviour of the pad state information access functions. The
+ * purpose of setting pad to 0 here is to avoid accessing memory
+ * outside the pads array, but still issuing warning of the
+ * invalid access while making the caller's error handling
+ * easier.
+ */
+ if (WARN_ON_ONCE(pad >= state->sd->entity.num_pads))
+ pad = 0;
+
+ return &state->pads[pad].crop;
+ }
+
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
@@ -1733,6 +1775,27 @@ v4l2_subdev_state_get_stream_compose(struct
v4l2_subdev_state *state,
struct v4l2_subdev_stream_configs *stream_configs;
unsigned int i;
+ if (WARN_ON_ONCE(!state))
+ return NULL;
+
+ if (state->pads) {
+ if (stream)
+ return NULL;
+
+ /*
+ * Set the pad to 0 on error as this is aligned with the
+ * behaviour of the pad state information access functions. The
+ * purpose of setting pad to 0 here is to avoid accessing memory
+ * outside the pads array, but still issuing warning of the
+ * invalid access while making the caller's error handling
+ * easier.
+ */
+ if (WARN_ON_ONCE(pad >= state->sd->entity.num_pads))
+ pad = 0;
+
+ return &state->pads[pad].compose;
+ }
+
lockdep_assert_held(state->lock);
stream_configs = &state->stream_configs;
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 46296852cb5b..6b242ec58cb7 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1543,7 +1543,8 @@ int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev
*sd,
* This returns a pointer to &struct v4l2_mbus_framefmt for the given pad +
* stream in the subdev state.
*
- * If the state does not contain the given pad + stream, NULL is returned.
+ * For stream-unaware drivers the format for the corresponding pad is returned.
+ * If the pad does not exist, NULL is returned.
*/
struct v4l2_mbus_framefmt *
v4l2_subdev_state_get_stream_format(struct v4l2_subdev_state *state,
@@ -1558,7 +1559,8 @@ v4l2_subdev_state_get_stream_format(struct
v4l2_subdev_state *state,
* This returns a pointer to crop rectangle for the given pad + stream in the
* subdev state.
*
- * If the state does not contain the given pad + stream, NULL is returned.
+ * For stream-unaware drivers the crop rectangle for the corresponding pad is
+ * returned. If the pad does not exist, NULL is returned.
*/
struct v4l2_rect *
v4l2_subdev_state_get_stream_crop(struct v4l2_subdev_state *state,
@@ -1574,7 +1576,8 @@ v4l2_subdev_state_get_stream_crop(struct
v4l2_subdev_state *state,
* This returns a pointer to compose rectangle for the given pad + stream in
the
* subdev state.
*
- * If the state does not contain the given pad + stream, NULL is returned.
+ * For stream-unaware drivers the compose rectangle for the corresponding pad
is
+ * returned. If the pad does not exist, NULL is returned.
*/
struct v4l2_rect *
v4l2_subdev_state_get_stream_compose(struct v4l2_subdev_state *state,
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