4.13-stable review patch. If anyone has any objections, please let me know.
------------------
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);