[PATCH] drm/amd/display: Use int for signed error code checks in commit planes

[Kazlauskas, Nicholas]

On 5/2/19 9:09 AM, Christian König wrote:
> 
> Am 02.05.19 um 15:08 schrieb Christian König:
>> Am 02.05.19 um 15:03 schrieb Nicholas Kazlauskas:
>>> [Why]
>>>
>>> The type of 'r' is uint32_t and the return codes for both:
>>>
>>> - reservation_object_wait_timeout_rcu
>>> - amdgpu_bo_reserve
>>>
>>> ...are signed. While it works for the latter since the check is
>>> done on != 0 it doesn't work for the former since we check <= 0.
>>>
>>> [How]
>>>
>>> Make 'r' an int in commit planes so we're not doing any unsigned/signed
>>> conversion here in the first place.
>>>
>>> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
>>> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
>>
>> Reviewed-by: Christian König <christian.koenig at amd.com>
> 
> Oh, wait a second. Shouldn't this even be a long instead of an int?
> 
> Christian.

To be fully correct on all architectures I suppose that's true. I'll 
repost it with that fixed. Thanks.

Nicholas Kazlauskas

> 
>>
>>> ---
>>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> index becd8cb3aab6..722f863ce4a4 100644
>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> @@ -5332,7 +5332,7 @@ static void amdgpu_dm_commit_planes(struct
>>> drm_atomic_state *state,
>>>                       struct drm_crtc *pcrtc,
>>>                       bool wait_for_vblank)
>>>   {
>>> -    uint32_t i, r;
>>> +    uint32_t i;
>>>       uint64_t timestamp_ns;
>>>       struct drm_plane *plane;
>>>       struct drm_plane_state *old_plane_state, *new_plane_state;
>>> @@ -5342,7 +5342,7 @@ static void amdgpu_dm_commit_planes(struct
>>> drm_atomic_state *state,
>>>       struct dm_crtc_state *acrtc_state =
>>> to_dm_crtc_state(new_pcrtc_state);
>>>       struct dm_crtc_state *dm_old_crtc_state =
>>> to_dm_crtc_state(drm_atomic_get_old_crtc_state(state, pcrtc));
>>> -    int planes_count = 0, vpos, hpos;
>>> +    int r, planes_count = 0, vpos, hpos;
>>>       unsigned long flags;
>>>       struct amdgpu_bo *abo;
>>>       uint64_t tiling_flags;
>>
>