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

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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:

commit 4953b6b22ab9d7f64706631a027b1ed1130ce4c8
Author: Christian König <christian.koenig@xxxxxxx>
Date:   Tue Sep 13 09:52:13 2022 +0200

    drm/amdgpu: cleanup error handling in amdgpu_cs_parser_bos

    Return early on success and so remove all those "if (r)" in the error
    path.

    Signed-off-by: Christian König <christian.koenig@xxxxxxx>
    Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>

Regards,
Christian.



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