Re: [PATCH v2] drm: move allocation out of drm_get_format_name()

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Am 07.11.2016 um 01:48 schrieb Eric Engestrom:
Fixes: 90844f00049e9f42573fd31d7c32e8fd31d3fd07

     drm: make drm_get_format_name thread-safe

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

Cc: Rob Clark <robdclark@xxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Suggested-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Eric Engestrom <eric@xxxxxxxxxxxx>
Acked-by: Christian König <christian.koenig@xxxxxxx>.

---

v2: use single-field struct instead of typedef to let the compiler
     enforce the type (Christian König)

---
  include/drm/drm_fourcc.h                        | 10 +++++-
  drivers/gpu/drm/drm_fourcc.c                    | 14 +++------
  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c          |  7 ++---
  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c          |  7 ++---
  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c           |  3 +-
  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c           |  7 ++---
  drivers/gpu/drm/drm_atomic.c                    |  7 +++--
  drivers/gpu/drm/drm_crtc.c                      |  7 +++--
  drivers/gpu/drm/drm_framebuffer.c               |  7 +++--
  drivers/gpu/drm/drm_modeset_helper.c            |  7 +++--
  drivers/gpu/drm/drm_plane.c                     |  7 +++--
  drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c |  7 ++---
  drivers/gpu/drm/i915/i915_debugfs.c             | 10 +++---
  drivers/gpu/drm/i915/intel_atomic_plane.c       |  8 ++---
  drivers/gpu/drm/i915/intel_display.c            | 41 ++++++++++---------------
  drivers/gpu/drm/radeon/atombios_crtc.c          | 14 ++++-----
  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c             |  3 +-
  17 files changed, 80 insertions(+), 86 deletions(-)

diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index dc0aafa..4b03ca0 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -45,6 +45,14 @@ struct drm_format_info {
  	u8 vsub;
  };
+/**
+ * struct drm_format_name_buf - name of a DRM format
+ * @str: string buffer containing the format name
+ */
+struct drm_format_name_buf {
+	char str[32];
+};
+
  const struct drm_format_info *__drm_format_info(u32 format);
  const struct drm_format_info *drm_format_info(u32 format);
  uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
@@ -54,6 +62,6 @@ int drm_format_horz_chroma_subsampling(uint32_t format);
  int drm_format_vert_chroma_subsampling(uint32_t format);
  int drm_format_plane_width(int width, uint32_t format, int plane);
  int drm_format_plane_height(int height, uint32_t format, int plane);
-char *drm_get_format_name(uint32_t format) __malloc;
+char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
#endif /* __DRM_FOURCC_H__ */
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index cbb8b77..99b0b60 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -79,17 +79,13 @@ uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
  EXPORT_SYMBOL(drm_mode_legacy_fb_format);
/**
- * drm_get_format_name - return a string for drm fourcc format
+ * drm_get_format_name - fill a string with a drm fourcc format's name
   * @format: format to compute name of
+ * @buf: caller-supplied buffer
- *
- * Note that the buffer returned by this function is owned by the caller
- * and will need to be freed using kfree().
   */
-char *drm_get_format_name(uint32_t format)
+char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
  {
-	char *buf = kmalloc(32, GFP_KERNEL);
-
-	snprintf(buf, 32,
+	snprintf(buf->str, sizeof(buf->str),
  		 "%c%c%c%c %s-endian (0x%08x)",
  		 printable_char(format & 0xff),
  		 printable_char((format >> 8) & 0xff),
@@ -98,7 +94,7 @@ char *drm_get_format_name(uint32_t format)
  		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
  		 format);
- return buf;
+	return buf->str;
  }
  EXPORT_SYMBOL(drm_get_format_name);
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 199d3f7..2924cdd 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -2032,7 +2032,7 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
  	u32 tmp, viewport_w, viewport_h;
  	int r;
  	bool bypass_lut = false;
-	char *format_name;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -2144,9 +2144,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
  		bypass_lut = true;
  		break;
  	default:
-		format_name = drm_get_format_name(target_fb->pixel_format);
-		DRM_ERROR("Unsupported screen format %s\n", format_name);
+		DRM_ERROR("Unsupported screen format %s\n",
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index ecd000e..f0e3c5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -2013,7 +2013,7 @@ 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;
-	char *format_name;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -2125,9 +2125,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
  		bypass_lut = true;
  		break;
  	default:
-		format_name = drm_get_format_name(target_fb->pixel_format);
-		DRM_ERROR("Unsupported screen format %s\n", format_name);
+		DRM_ERROR("Unsupported screen format %s\n",
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index 44547f9..5c6b82f 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -1456,6 +1456,7 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
  	u32 viewport_w, viewport_h;
  	int r;
  	bool bypass_lut = false;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -1559,7 +1560,7 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
  		break;
  	default:
  		DRM_ERROR("Unsupported screen format %s\n",
-			  drm_get_format_name(target_fb->pixel_format));
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 979aedf..5aef19d 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -1910,7 +1910,7 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
  	u32 viewport_w, viewport_h;
  	int r;
  	bool bypass_lut = false;
-	char *format_name;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -2015,9 +2015,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
  		bypass_lut = true;
  		break;
  	default:
-		format_name = drm_get_format_name(target_fb->pixel_format);
-		DRM_ERROR("Unsupported screen format %s\n", format_name);
+		DRM_ERROR("Unsupported screen format %s\n",
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index c32fb3c..f29d3c5 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -835,9 +835,10 @@ static int drm_atomic_plane_check(struct drm_plane *plane,
  	/* Check whether this plane supports the fb pixel format. */
  	ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
  	if (ret) {
-		char *format_name = drm_get_format_name(state->fb->pixel_format);
-		DRM_DEBUG_ATOMIC("Invalid pixel format %s\n", format_name);
+		struct drm_format_name_buf format_name;
+		DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
+		                 drm_get_format_name(state->fb->pixel_format,
+		                                     &format_name));
-		kfree(format_name);
  		return ret;
  	}
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 13441e2..08ac216 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -827,9 +827,10 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
  			ret = drm_plane_check_pixel_format(crtc->primary,
  							   fb->pixel_format);
  			if (ret) {
-				char *format_name = drm_get_format_name(fb->pixel_format);
-				DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
+				struct drm_format_name_buf format_name;
+				DRM_DEBUG_KMS("Invalid pixel format %s\n",
+				              drm_get_format_name(fb->pixel_format,
+				                                  &format_name));
-				kfree(format_name);
  				goto out;
  			}
  		}
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index 49fd7db..df6b180 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -133,9 +133,10 @@ static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
info = __drm_format_info(r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN);
  	if (!info) {
-		char *format_name = drm_get_format_name(r->pixel_format);
-		DRM_DEBUG_KMS("bad framebuffer format %s\n", format_name);
+		struct drm_format_name_buf format_name;
+		DRM_DEBUG_KMS("bad framebuffer format %s\n",
+		              drm_get_format_name(r->pixel_format,
+		                                  &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c
index 2544dfe..2f452b3 100644
--- a/drivers/gpu/drm/drm_modeset_helper.c
+++ b/drivers/gpu/drm/drm_modeset_helper.c
@@ -75,10 +75,11 @@ void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
info = drm_format_info(mode_cmd->pixel_format);
  	if (!info || !info->depth) {
-		char *format_name = drm_get_format_name(mode_cmd->pixel_format);
+		struct drm_format_name_buf format_name;
- DRM_DEBUG_KMS("non-RGB pixel format %s\n", format_name);
+		DRM_DEBUG_KMS("non-RGB pixel format %s\n",
+		              drm_get_format_name(mode_cmd->pixel_format,
+		                                  &format_name));
-		kfree(format_name);
fb->depth = 0;
  		fb->bits_per_pixel = 0;
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 249c0ae..2ba0c22 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -479,9 +479,10 @@ static int __setplane_internal(struct drm_plane *plane,
  	/* Check whether this plane supports the fb pixel format. */
  	ret = drm_plane_check_pixel_format(plane, fb->pixel_format);
  	if (ret) {
-		char *format_name = drm_get_format_name(fb->pixel_format);
-		DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
+		struct drm_format_name_buf format_name;
+		DRM_DEBUG_KMS("Invalid pixel format %s\n",
+		              drm_get_format_name(fb->pixel_format,
+		                                  &format_name));
-		kfree(format_name);
  		goto out;
  	}
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
index 7e7a4d4..afc2b5d 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
@@ -608,17 +608,16 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
  			 u32 ch, u32 y, u32 in_h, u32 fmt)
  {
  	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
-	char *format_name;
+	struct drm_format_name_buf format_name;
  	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
  	u32 stride = fb->pitches[0];
  	u32 addr = (u32)obj->paddr + y * stride;
DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
  			 ch + 1, y, in_h, stride, (u32)obj->paddr);
-	format_name = drm_get_format_name(fb->pixel_format);
  	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
-			 addr, fb->width, fb->height, fmt, format_name);
+			 addr, fb->width, fb->height, fmt,
+			 drm_get_format_name(fb->pixel_format, &format_name));
-	kfree(format_name);
/* get reg offset */
  	reg_ctrl = RD_CH_CTRL(ch);
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 20638d2..670423e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2971,7 +2971,7 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
  	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
  		struct drm_plane_state *state;
  		struct drm_plane *plane = &intel_plane->base;
-		char *format_name;
+		struct drm_format_name_buf format_name;
if (!plane->state) {
  			seq_puts(m, "plane->state is NULL!\n");
@@ -2981,9 +2981,9 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
  		state = plane->state;
if (state->fb) {
-			format_name = drm_get_format_name(state->fb->pixel_format);
+			drm_get_format_name(state->fb->pixel_format, &format_name);
  		} else {
-			format_name = kstrdup("N/A", GFP_KERNEL);
+			sprintf(format_name.str, "N/A");
  		}
seq_printf(m, "\t--Plane id %d: type=%s, crtc_pos=%4dx%4d, crtc_size=%4dx%4d, src_pos=%d.%04ux%d.%04u, src_size=%d.%04ux%d.%04u, format=%s, rotation=%s\n",
@@ -2999,10 +2999,8 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
  			   ((state->src_w & 0xffff) * 15625) >> 10,
  			   (state->src_h >> 16),
  			   ((state->src_h & 0xffff) * 15625) >> 10,
-			   format_name,
+			   format_name.str,
  			   plane_rotation(state->rotation));
-
-		kfree(format_name);
  	}
  }
diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index c762ae5..6c76e3d 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -143,7 +143,7 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
  		crtc_state->base.enable ? crtc_state->pipe_src_h : 0;
if (state->fb && drm_rotation_90_or_270(state->rotation)) {
-		char *format_name;
+		struct drm_format_name_buf format_name;
if (!(state->fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
  			state->fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED)) {
@@ -159,9 +159,9 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
  		switch (state->fb->pixel_format) {
  		case DRM_FORMAT_C8:
  		case DRM_FORMAT_RGB565:
-			format_name = drm_get_format_name(state->fb->pixel_format);
-			DRM_DEBUG_KMS("Unsupported pixel format %s for 90/270!\n", format_name);
+			DRM_DEBUG_KMS("Unsupported pixel format %s for 90/270!\n",
+			              drm_get_format_name(state->fb->pixel_format,
+			                                  &format_name));
-			kfree(format_name);
  			return -EINVAL;
default:
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6f8f6ec..8209170 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12871,7 +12871,7 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
DRM_DEBUG_KMS("planes on this crtc\n");
  	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
-		char *format_name;
+		struct drm_format_name_buf format_name;
  		intel_plane = to_intel_plane(plane);
  		if (intel_plane->pipe != crtc->pipe)
  			continue;
@@ -12884,12 +12884,11 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
  			continue;
  		}
- format_name = drm_get_format_name(fb->pixel_format);
-
  		DRM_DEBUG_KMS("[PLANE:%d:%s] enabled",
  			      plane->base.id, plane->name);
  		DRM_DEBUG_KMS("\tFB:%d, fb = %ux%u format = %s",
-			      fb->base.id, fb->width, fb->height, format_name);
+			      fb->base.id, fb->width, fb->height,
+			      drm_get_format_name(fb->pixel_format, &format_name));
  		DRM_DEBUG_KMS("\tscaler:%d src %dx%d+%d+%d dst %dx%d+%d+%d\n",
  			      state->scaler_id,
  			      state->base.src.x1 >> 16,
@@ -12899,8 +12898,6 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
  			      state->base.dst.x1, state->base.dst.y1,
  			      drm_rect_width(&state->base.dst),
  			      drm_rect_height(&state->base.dst));
-
-		kfree(format_name);
  	}
  }
@@ -15749,7 +15746,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
  	unsigned int tiling = i915_gem_object_get_tiling(obj);
  	int ret;
  	u32 pitch_limit, stride_alignment;
-	char *format_name;
+	struct drm_format_name_buf format_name;
WARN_ON(!mutex_is_locked(&dev->struct_mutex)); @@ -15840,18 +15837,16 @@ static int intel_framebuffer_init(struct drm_device *dev,
  		break;
  	case DRM_FORMAT_XRGB1555:
  		if (INTEL_INFO(dev)->gen > 3) {
-			format_name = drm_get_format_name(mode_cmd->pixel_format);
-			DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+			          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-			kfree(format_name);
  			return -EINVAL;
  		}
  		break;
  	case DRM_FORMAT_ABGR8888:
  		if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
  		    INTEL_INFO(dev)->gen < 9) {
-			format_name = drm_get_format_name(mode_cmd->pixel_format);
-			DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+			          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-			kfree(format_name);
  			return -EINVAL;
  		}
  		break;
@@ -15859,17 +15854,15 @@ static int intel_framebuffer_init(struct drm_device *dev,
  	case DRM_FORMAT_XRGB2101010:
  	case DRM_FORMAT_XBGR2101010:
  		if (INTEL_INFO(dev)->gen < 4) {
-			format_name = drm_get_format_name(mode_cmd->pixel_format);
-			DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+			          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-			kfree(format_name);
  			return -EINVAL;
  		}
  		break;
  	case DRM_FORMAT_ABGR2101010:
  		if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
-			format_name = drm_get_format_name(mode_cmd->pixel_format);
-			DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+			          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-			kfree(format_name);
  			return -EINVAL;
  		}
  		break;
@@ -15878,16 +15871,14 @@ static int intel_framebuffer_init(struct drm_device *dev,
  	case DRM_FORMAT_YVYU:
  	case DRM_FORMAT_VYUY:
  		if (INTEL_INFO(dev)->gen < 5) {
-			format_name = drm_get_format_name(mode_cmd->pixel_format);
-			DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+			          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-			kfree(format_name);
  			return -EINVAL;
  		}
  		break;
  	default:
-		format_name = drm_get_format_name(mode_cmd->pixel_format);
-		DRM_DEBUG("unsupported pixel format: %s\n", format_name);
+		DRM_DEBUG("unsupported pixel format: %s\n",
+		          drm_get_format_name(mode_cmd->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 74f99ba..05f4ebe 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1156,7 +1156,7 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
  	u32 tmp, viewport_w, viewport_h;
  	int r;
  	bool bypass_lut = false;
-	char *format_name;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -1260,9 +1260,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
  		bypass_lut = true;
  		break;
  	default:
-		format_name = drm_get_format_name(target_fb->pixel_format);
-		DRM_ERROR("Unsupported screen format %s\n", format_name);
+		DRM_ERROR("Unsupported screen format %s\n",
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
@@ -1473,7 +1472,7 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
  	u32 viewport_w, viewport_h;
  	int r;
  	bool bypass_lut = false;
-	char *format_name;
+	struct drm_format_name_buf format_name;
/* no fb bound */
  	if (!atomic && !crtc->primary->fb) {
@@ -1563,9 +1562,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
  		bypass_lut = true;
  		break;
  	default:
-		format_name = drm_get_format_name(target_fb->pixel_format);
-		DRM_ERROR("Unsupported screen format %s\n", format_name);
+		DRM_ERROR("Unsupported screen format %s\n",
+		          drm_get_format_name(target_fb->pixel_format, &format_name));
-		kfree(format_name);
  		return -EINVAL;
  	}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index c965514..e3f68cc 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -985,8 +985,9 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
info = drm_format_info(mode_cmd2->pixel_format);
  	if (!info || !info->depth) {
+		struct drm_format_name_buf format_name;
  		DRM_ERROR("Unsupported framebuffer format %s\n",
-			  drm_get_format_name(mode_cmd2->pixel_format));
+		          drm_get_format_name(mode_cmd2->pixel_format, &format_name));
  		return ERR_PTR(-EINVAL);
  	}


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