This is a note to let you know that I've just added the patch titled
drm/bridge/panel: Fix runtime warning on panel bridge release
to the 4.19-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-bridge-panel-fix-runtime-warning-on-panel-bridge.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 594757540d0194d0e5ec97ca6c18f1a12e29886c
Author: Adam Miotk <adam.miotk@xxxxxxx>
Date: Mon Jun 10 11:27:39 2024 +0100
drm/bridge/panel: Fix runtime warning on panel bridge release
[ Upstream commit ce62600c4dbee8d43b02277669dd91785a9b81d9 ]
Device managed panel bridge wrappers are created by calling to
drm_panel_bridge_add_typed() and registering a release handler for
clean-up when the device gets unbound.
Since the memory for this bridge is also managed and linked to the panel
device, the release function should not try to free that memory.
Moreover, the call to devm_kfree() inside drm_panel_bridge_remove() will
fail in this case and emit a warning because the panel bridge resource
is no longer on the device resources list (it has been removed from
there before the call to release handlers).
Fixes: 67022227ffb1 ("drm/bridge: Add a devm_ allocator for panel bridge.")
Signed-off-by: Adam Miotk <adam.miotk@xxxxxxx>
Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240610102739.139852-1-adam.miotk@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 7cbaba213ef69..2d6f8280fc712 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -205,9 +205,12 @@ EXPORT_SYMBOL(drm_panel_bridge_remove);
static void devm_drm_panel_bridge_release(struct device *dev, void *res)
{
- struct drm_bridge **bridge = res;
+ struct drm_bridge *bridge = *(struct drm_bridge **)res;
- drm_panel_bridge_remove(*bridge);
+ if (!bridge)
+ return;
+
+ drm_bridge_remove(bridge);
}
struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
