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| author | Jeffy Chen <jeffy.chen@rock-chips.com> | 2017-10-09 14:46:41 +0800 |
|---|---|---|
| committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2017-10-09 14:26:45 +0200 |
| commit | 78279127253a6c36ed8829eb2b7bc28ef48d9717 (patch) | |
| tree | ff1a3b2f49094e7727c99be4b2ce19700e7ca7eb | |
| parent | 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f (diff) | |
| download | linux-rseq-78279127253a6c36ed8829eb2b7bc28ef48d9717.tar.gz | |
drm/atomic: Unref duplicated drm_atomic_state in drm_atomic_helper_resume()
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@rock-chips.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009064641.15174-1-jeffy.chen@rock-chips.com
Fixes: 0853695c3ba4 ("drm: Add reference counting to drm_atomic_state")
Cc: <stable@vger.kernel.org> # v4.10+
(cherry picked from commit 6d281b1f79e194c02125da29ea77316810261ca8)
| -rw-r--r-- | drivers/gpu/drm/drm_atomic_helper.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 4e53aae9a1fb1..0028591f3f959 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -2960,6 +2960,7 @@ out: drm_modeset_backoff(&ctx); } + drm_atomic_state_put(state); drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); |