Re: [PATCH AUTOSEL 6.0 38/44] drm/amdgpu: Unlock bo_list_mutex after error handling

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On Mon, Nov 21, 2022 at 12:07:40PM +0100, Christian König wrote:
Am 21.11.22 um 10:57 schrieb Michel Dänzer:
On 11/19/22 03:11, Sasha Levin wrote:
From: Philip Yang <Philip.Yang@xxxxxxx>

[ Upstream commit 64f65135c41a75f933d3bca236417ad8e9eb75de ]

Get below kernel WARNING backtrace when pressing ctrl-C to kill kfdtest
application.

If amdgpu_cs_parser_bos returns error after taking bo_list_mutex, as
caller amdgpu_cs_ioctl will not unlock bo_list_mutex, this generates the
kernel WARNING.

Add unlock bo_list_mutex after amdgpu_cs_parser_bos error handling to
cleanup bo_list userptr bo.

 WARNING: kfdtest/2930 still has locks held!
 1 lock held by kfdtest/2930:
  (&list->bo_list_mutex){+.+.}-{3:3}, at: amdgpu_cs_ioctl+0xce5/0x1f10 [amdgpu]
  stack backtrace:
   dump_stack_lvl+0x44/0x57
   get_signal+0x79f/0xd00
   arch_do_signal_or_restart+0x36/0x7b0
   exit_to_user_mode_prepare+0xfd/0x1b0
   syscall_exit_to_user_mode+0x19/0x40
   do_syscall_64+0x40/0x80

Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index b7bae833c804..9d59f83c8faa 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -655,6 +655,7 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
 		}
 		mutex_unlock(&p->bo_list->bo_list_mutex);
 	}
+	mutex_unlock(&p->bo_list->bo_list_mutex);
 	return r;
 }
Looks doubtful that this is a correct backport — there's an identical mutex_unlock call just above.


Oh, yes good point. This patch doesn't needs to be backported at all because it just fixes a problem introduced in the same cycle:

Dropping it, thanks!

--
Thanks,
Sasha



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