drm/amd/gfx11: move the gfx mutex into the caller

Otherwise we can fail to drop the software mutex when
we fail to take the hardware mutex.

Fixes: 76acba7b7f12 ("drm/amdgpu/gfx11: add a mutex for the gfx semaphore")
Reported-by: Dan Carpenter <[e-mail]>
Reviewed-by: Dan Carpenter <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c

···
 {
 	u32 i, tmp, val;
 
-	if (req)
-		mutex_lock(&adev->gfx.reset_sem_mutex);
 	for (i = 0; i < adev->usec_timeout; i++) {
 		/* Request with MeId=2, PipeId=0 */
 		tmp = REG_SET_FIELD(0, CP_GFX_INDEX_MUTEX, REQUEST, req);
···
 		}
 		udelay(1);
 	}
-	if (!req)
-		mutex_unlock(&adev->gfx.reset_sem_mutex);
 
 	if (i >= adev->usec_timeout)
 		return -EINVAL;
···
 	mutex_unlock(&adev->srbm_mutex);
 
 	/* Try to acquire the gfx mutex before access to CP_VMID_RESET */
+	mutex_lock(&adev->gfx.reset_sem_mutex);
 	r = gfx_v11_0_request_gfx_index_mutex(adev, true);
 	if (r) {
+		mutex_unlock(&adev->gfx.reset_sem_mutex);
 		DRM_ERROR("Failed to acquire the gfx mutex during soft reset\n");
 		return r;
 	}
···
 
 	/* release the gfx mutex */
 	r = gfx_v11_0_request_gfx_index_mutex(adev, false);
+	mutex_unlock(&adev->gfx.reset_sem_mutex);
 	if (r) {
 		DRM_ERROR("Failed to release the gfx mutex during soft reset\n");
 		return r;