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drm/amdgpu: fix kernel hang when starting VNC server 

After starting VNC server or running CTS test, kernel will hang and
can see below call trace:

[961816] INFO: task khugepaged:42 blocked for more than 120 seconds.
[968581]       Tainted: G           OE   4.13.0 #1
[973495] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
          this message.
[980962] khugepaged      D    0    42      2 0x00000000
[980967] Call Trace:
[980977]  __schedule+0x28d/0x890
[980982]  schedule+0x36/0x80
[980986]  rwsem_down_read_failed+0x139/0x1c0
[980991]  ? update_curr+0x100/0x1c0
[981004]  call_rwsem_down_read_failed+0x18/0x30
[981007]  down_read+0x20/0x40
[981012]  khugepaged_scan_mm_slot+0x78/0x1ac0
[981018]  ? __switch_to+0x23e/0x4a0
[981022]  ? finish_task_switch+0x79/0x240
[981026]  khugepaged+0x146/0x480
[981031]  ? remove_wait_queue+0x60/0x60
[981035]  kthread+0x109/0x140
[981037]  ? khugepaged_scan_mm_slot+0x1ac0/0x1ac0
[981039]  ? kthread_park+0x60/0x60
[981044]  ret_from_fork+0x25/0x30

After checking code and found 'commit b72cf4fca2 ("drm/amdgpu: move
taking mmap_sem into get_user_pages v2")' forget to drop one case of
up_read.

Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Xiangliang.Yu 2017-10-20 17:21:40 +08:00 committed by Alex Deucher
parent 135f971181
commit d5a480b44b
1 changed files with 1 additions and 4 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
View File

@ -328,7 +328,7 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
r = amdgpu_ttm_tt_get_user_pages(bo->tbo.ttm,
bo->tbo.ttm->pages);
if (r)
goto unlock_mmap_sem;
goto release_object;
r = amdgpu_bo_reserve(bo, true);
if (r)
@ -353,9 +353,6 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
free_pages:
release_pages(bo->tbo.ttm->pages, bo->tbo.ttm->num_pages, false);
unlock_mmap_sem:
up_read(&current->mm->mmap_sem);
release_object:
drm_gem_object_put_unlocked(gobj);