From: Rahul Kumar rahul.kumar1@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.Siqueira@amd.com Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Rahul Kumar rahul.kumar1@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@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 e3a62873c0e7..ffe496131635 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 @@ -3242,7 +3242,7 @@ 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;