From: Rahul Kumar <rahul.kum...@amd.com>
[ Upstream commit 1c4dae3e4639540fb567e570cc56a3c292afb6fe ]
We observed hard hang due to NULL derefrence This issue is seen after
running system all the time after two or three days
struct dc *dc = plane_state->ctx->dc; Randomly in long run we found
plane_state or plane_state->ctx is found NULL which causes exception.
BUG: kernel NULL pointer dereference, address: 0000000000000000
PF: supervisor read access in kernel mode
PF: error_code(0x0000) - not-present page
PGD 1dc7f2067 P4D 1dc7f2067 PUD 222c75067 PMD 0
Oops: 0000 [#1] SMP NOPTI
CPU: 5 PID: 29855 Comm: kworker/u16:4 ...
...
Workqueue: events_unbound commit_work [drm_kms_helper]
RIP: 0010:dcn10_update_pending_status+0x1f/0xee [amdgpu]
Code: 41 5f c3 0f 1f 44 00 00 b0 01 c3 0f 1f 44 00 00 41 55 41 54 55 53 48 8b
1f 4c 8b af f8 00 00 00 48 8b 83 88 03 00 00 48 85 db <4c> 8b 20 0f 84 bf 00 00
00 48 89 fd 48 8b bf b8 00 00 00 48 8b 07
RSP: 0018:ffff942941997ab8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8d7fd98d2000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8d7e3e87c708 RDI: ffff8d7f2d8c0690
RBP: ffff8d7f2d8c0000 R08: ffff942941997a34 R09: 00000000ffffffff
R10: 0000000000005000 R11: 00000000000000f0 R12: ffff8d7f2d8c0690
R13: ffff8d8035a41680 R14: 00000000000186a0 R15: ffff8d7f2d8c1dd8
FS: 0000000000000000(0000) GS:ffff8d8037340000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000148030000 CR4: 00000000003406e0
Call Trace:
dc_commit_state+0x6a2/0x7f0 [amdgpu]
amdgpu_dm_atomic_commit_tail+0x460/0x19bb [amdgpu]
Tested-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Signed-off-by: Rahul Kumar <rahul.kum...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 31a13daf4289..7172ec9a11d2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3308,7 +3308,7 @@ void dcn10_update_pending_status(struct pipe_ctx
*pipe_ctx)
struct dc_plane_state *plane_state = pipe_ctx->plane_state;
struct timing_generator *tg = pipe_ctx->stream_res.tg;
bool flip_pending;
- struct dc *dc = plane_state->ctx->dc;
+ struct dc *dc = pipe_ctx->stream->ctx->dc;
if (plane_state == NULL)
return;
--
2.35.1
