3 Commits

Author	SHA1	Message	Date
Dmitry Baryshkov	6914968a0b	drm/bridge: properly refcount DT nodes in aux bridge drivers ... The aux-bridge and aux-hpd-bridge drivers didn't call of_node_get() on the device nodes further used for dev->of_node and platform data. When bridge devices are released, the reference counts are decreased, resulting in refcount underflow / use-after-free warnings. Get corresponding refcounts during AUX bridge allocation. Reported-by: Luca Weiss <luca.weiss@fairphone.com> Fixes: 2a04739139 ("drm/bridge: add transparent bridge helper") Fixes: 26f4bac3d8 ("drm/bridge: aux-hpd: Replace of_device.h with explicit include") Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231216235910.911958-1-dmitry.baryshkov@linaro.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>	2023-12-19 02:06:16 +02:00
Rob Herring	26f4bac3d8	drm/bridge: aux-hpd: Replace of_device.h with explicit include ... The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it was merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. Soon the implicit includes are going to be removed. of_device.h isn't needed, but of.h is for of_node_put(). Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20231207162501.2629952-1-robh@kernel.org Signed-off-by: Rob Herring <robh@kernel.org>	2023-12-07 11:51:01 -06:00
Dmitry Baryshkov	e560518a6c	drm/bridge: implement generic DP HPD bridge ... Several USB-C controllers implement a pretty simple DRM bridge which implements just the HPD notification operations. Add special helper for creating such simple bridges. Acked-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231203114333.1305826-5-dmitry.baryshkov@linaro.org	2023-12-04 16:07:29 +02:00