This is a note to let you know that I've just added the patch titled
drm/radeon/radeon_display: Decrease the size of allocated memory
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-radeon_display-decrease-the-size-of-alloc.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 94deb2dd41eaa7798925874b5d1e4b17fa101cc9
Author: Erick Archer <erick.archer@xxxxxxxxxxx>
Date: Sat Mar 30 17:34:47 2024 +0100
drm/radeon/radeon_display: Decrease the size of allocated memory
[ Upstream commit ae6a233092747e9652eb793d92f79d0820e01c6a ]
This is an effort to get rid of all multiplications from allocation
functions in order to prevent integer overflows [1] [2].
In this case, the memory allocated to store RADEONFB_CONN_LIMIT pointers
to "drm_connector" structures can be avoided. This is because this
memory area is never accessed.
Also, in the kzalloc function, it is preferred to use sizeof(*pointer)
instead of sizeof(type) due to the type of the variable can change and
one needs not change the former (unlike the latter).
At the same time take advantage to remove the "#if 0" block, the code
where the removed memory area was accessed, and the RADEONFB_CONN_LIMIT
constant due to now is never used.
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/160 [2]
Acked-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Erick Archer <erick.archer@xxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 3d3d2109dfebc..426a49851e349 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -132,7 +132,6 @@ extern int radeon_cik_support;
/* RADEON_IB_POOL_SIZE must be a power of 2 */
#define RADEON_IB_POOL_SIZE 16
#define RADEON_DEBUGFS_MAX_COMPONENTS 32
-#define RADEONFB_CONN_LIMIT 4
#define RADEON_BIOS_NUM_SCRATCH 8
/* internal ring indices */
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index efd18c8d84c83..5f1d24d3120c4 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -683,7 +683,7 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
struct radeon_device *rdev = dev->dev_private;
struct radeon_crtc *radeon_crtc;
- radeon_crtc = kzalloc(sizeof(struct radeon_crtc) + (RADEONFB_CONN_LIMIT * sizeof(struct drm_connector *)), GFP_KERNEL);
+ radeon_crtc = kzalloc(sizeof(*radeon_crtc), GFP_KERNEL);
if (radeon_crtc == NULL)
return;
@@ -709,12 +709,6 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
dev->mode_config.cursor_width = radeon_crtc->max_cursor_width;
dev->mode_config.cursor_height = radeon_crtc->max_cursor_height;
-#if 0
- radeon_crtc->mode_set.crtc = &radeon_crtc->base;
- radeon_crtc->mode_set.connectors = (struct drm_connector **)(radeon_crtc + 1);
- radeon_crtc->mode_set.num_connectors = 0;
-#endif
-
if (rdev->is_atom_bios && (ASIC_IS_AVIVO(rdev) || radeon_r4xx_atom))
radeon_atombios_init_crtc(dev, radeon_crtc);
else
