This is a note to let you know that I've just added the patch titled drm/atomic: Unref duplicated drm_atomic_state in drm_atomic_helper_resume() to the 4.13-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-atomic-unref-duplicated-drm_atomic_state-in-drm_atomic_helper_resume.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 78279127253a6c36ed8829eb2b7bc28ef48d9717 Mon Sep 17 00:00:00 2001 From: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx> Date: Mon, 9 Oct 2017 14:46:41 +0800 Subject: drm/atomic: Unref duplicated drm_atomic_state in drm_atomic_helper_resume() From: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx> commit 78279127253a6c36ed8829eb2b7bc28ef48d9717 upstream. Kmemleak reported memory leak after suspend and resume: unreferenced object 0xffffffc0e31d8880 (size 128): comm "bash", pid 181, jiffies 4294763583 (age 24.694s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 20 a2 eb c0 ff ff ff ......... ...... 01 00 00 00 00 00 00 00 80 87 1d e3 c0 ff ff ff ................ backtrace: [<ffffffc00034bb64>] __save_stack_trace+0x48/0x6c [<ffffffc00034c244>] create_object+0x138/0x254 [<ffffffc0009dd218>] kmemleak_alloc+0x58/0x8c [<ffffffc000346de4>] kmem_cache_alloc_trace+0x188/0x254 [<ffffffc0005af4c0>] drm_atomic_state_alloc+0x3c/0x88 [<ffffffc000591f0c>] drm_atomic_helper_duplicate_state+0x28/0x158 [<ffffffc000592098>] drm_atomic_helper_suspend+0x5c/0xf0 Problem here is that we are duplicating the drm_atomic_state in drm_atomic_helper_suspend(), but not unreference it in the resume path. Fixes: 1494276000db ("drm/atomic-helper: Implement subsystem-level suspend/resume") Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20171009064641.15174-1-jeffy.chen@xxxxxxxxxxxxxx Fixes: 0853695c3ba4 ("drm: Add reference counting to drm_atomic_state") (cherry picked from commit 6d281b1f79e194c02125da29ea77316810261ca8) Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/drm_atomic_helper.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -2756,6 +2756,7 @@ out: drm_modeset_backoff(&ctx); } + drm_atomic_state_put(state); drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); Patches currently in stable-queue which might be from jeffy.chen@xxxxxxxxxxxxxx are queue-4.13/drm-atomic-unref-duplicated-drm_atomic_state-in-drm_atomic_helper_resume.patch