The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x b2139c96dc954b58b81bc670fc4ea5f034ed062c # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024012729-unfunded-dupe-2fa7@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

b2139c96dc95 ("drm/amd/display: Drop 'acrtc' and add 'new_crtc_state' NULL check for writeback requests.") c81e13b929df ("drm/amd/display: Hande writeback request from userspace")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b2139c96dc954b58b81bc670fc4ea5f034ed062c Mon Sep 17 00:00:00 2001 From: Srinivasan Shanmugam srinivasan.shanmugam@amd.com Date: Sat, 13 Jan 2024 14:32:27 +0530 Subject: [PATCH] drm/amd/display: Drop 'acrtc' and add 'new_crtc_state' NULL check for writeback requests.

Return value of 'to_amdgpu_crtc' which is container_of(...) can't be null, so it's null check 'acrtc' is dropped.

Fixing the below: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9302 amdgpu_dm_atomic_commit_tail() error: we previously assumed 'acrtc' could be null (see line 9299)

Added 'new_crtc_state' NULL check for function 'drm_atomic_get_new_crtc_state' that retrieves the new state for a CRTC, while enabling writeback requests.

Cc: stable@vger.kernel.org Cc: Alex Hung alex.hung@amd.com Cc: Aurabindo Pillai aurabindo.pillai@amd.com Cc: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Cc: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Srinivasan Shanmugam srinivasan.shanmugam@amd.com Reviewed-by: Alex Hung alex.hung@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 10b2a896c498..d55eeb30ccb2 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -9293,10 +9293,10 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state) if (!new_con_state->writeback_job) continue;

- new_crtc_state = NULL; + new_crtc_state = drm_atomic_get_new_crtc_state(state, &acrtc->base);

- if (acrtc) - new_crtc_state = drm_atomic_get_new_crtc_state(state, &acrtc->base); + if (!new_crtc_state) + continue;

if (acrtc->wb_enabled) continue;