drm: make drm_get_format_name thread-safe

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
[danvet: Clarify that the returned pointer must be freed with
kfree().]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index d4bf133908b1..1558a974ad00 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -2046,6 +2046,7 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
         u32 tmp, viewport_w, viewport_h;
         int r;
         bool bypass_lut = false;
+        const char *format_name;
 
         /* no fb bound */
         if (!atomic && !crtc->primary->fb) {
@@ -2157,8 +2158,9 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
                 bypass_lut = true;
                 break;
         default:
-                DRM_ERROR("Unsupported screen format %s\n",
-                        drm_get_format_name(target_fb->pixel_format));
+                format_name = drm_get_format_name(target_fb->pixel_format);
+                DRM_ERROR("Unsupported screen format %s\n", format_name);
+                kfree(format_name);
                 return -EINVAL;
         }