Re: [Intel-gfx] [PATCH] drm: make drm_get_format_name thread-safe

[Daniel Vetter]

On Thu, Nov 03, 2016 at 02:52:00PM -0400, Rob Clark wrote:
> On Sun, Aug 14, 2016 at 8:02 PM, Eric Engestrom <eric@xxxxxxxxxxxx> wrote:
> > Signed-off-by: Eric Engestrom <eric@xxxxxxxxxxxx>
> > ---
> >
> > I moved the main bits to be the first diffs, shouldn't affect anything
> > when applying the patch, but I wanted to ask:
> > I don't like the hard-coded `32` the appears in both kmalloc() and
> > snprintf(), what do you think? If you don't like it either, what would
> > you suggest? Should I #define it?
> >
> > Second question is about the patch mail itself: should I send this kind
> > of patch separated by module, with a note requesting them to be squashed
> > when applying? It has to land as a single patch, but for review it might
> > be easier if people only see the bits they each care about, as well as
> > to collect ack's/r-b's.
> >
> > Cheers,
> >   Eric
> >
> > ---
> >  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c          |  6 ++--
> >  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c          |  6 ++--
> >  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c           |  6 ++--
> >  drivers/gpu/drm/drm_atomic.c                    |  5 ++--
> >  drivers/gpu/drm/drm_crtc.c                      | 21 ++++++++-----
> >  drivers/gpu/drm/drm_fourcc.c                    | 17 ++++++-----
> >  drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c |  6 ++--
> >  drivers/gpu/drm/i915/i915_debugfs.c             | 11 ++++++-
> >  drivers/gpu/drm/i915/intel_atomic_plane.c       |  6 ++--
> >  drivers/gpu/drm/i915/intel_display.c            | 39 ++++++++++++++++---------
> >  drivers/gpu/drm/radeon/atombios_crtc.c          | 12 +++++---
> >  include/drm/drm_fourcc.h                        |  2 +-
> >  12 files changed, 89 insertions(+), 48 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > index 0645c85..38216a1 100644
> > --- a/drivers/gpu/drm/drm_fourcc.c
> > +++ b/drivers/gpu/drm/drm_fourcc.c
> > @@ -39,16 +39,14 @@ static char printable_char(int c)
> >   * drm_get_format_name - return a string for drm fourcc format
> >   * @format: format to compute name of
> >   *
> > - * Note that the buffer used by this function is globally shared and owned by
> > - * the function itself.
> > - *
> > - * FIXME: This isn't really multithreading safe.
> > + * Note that the buffer returned by this function is owned by the caller
> > + * and will need to be freed.
> >   */
> >  const char *drm_get_format_name(uint32_t format)
> >  {
> > -       static char buf[32];
> > +       char *buf = kmalloc(32, GFP_KERNEL);
> 
> 
> hmm, I guess I wasn't paying attention at the time this patch came by,
> but unfortunately this makes drm_get_format_name() no longer safe in
> atomic contexts :-/
> 
> We should probably either revert this or have two variants of
> drm_get_format_name()?  (ie. one that is not thread safe but is good
> enough for debugging)

Where do we need that for atomic contexts? I guess worst-case we could do
an auto-GFP trick using drm_can_sleep or something like that.
-Daniel

> 
> BR,
> -R
> 
> > -       snprintf(buf, sizeof(buf),
> > +       snprintf(buf, 32,
> >                  "%c%c%c%c %s-endian (0x%08x)",
> >                  printable_char(format & 0xff),
> >                  printable_char((format >> 8) & 0xff),
> > @@ -73,6 +71,8 @@ EXPORT_SYMBOL(drm_get_format_name);
> >  void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
> >                           int *bpp)
> >  {
> > +       const char *format_name;
> > +
> >         switch (format) {
> >         case DRM_FORMAT_C8:
> >         case DRM_FORMAT_RGB332:
> > @@ -127,8 +127,9 @@ void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
> >                 *bpp = 32;
> >                 break;
> >         default:
> > -               DRM_DEBUG_KMS("unsupported pixel format %s\n",
> > -                             drm_get_format_name(format));
> > +               format_name = drm_get_format_name(format);
> > +               DRM_DEBUG_KMS("unsupported pixel format %s\n", format_name);
> > +               kfree(format_name);
> >                 *depth = 0;
> >                 *bpp = 0;
> >                 break;
> > diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> > index 7f90a39..030d22d 100644
> > --- a/include/drm/drm_fourcc.h
> > +++ b/include/drm/drm_fourcc.h
> > @@ -32,6 +32,6 @@ 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);
> > -const char *drm_get_format_name(uint32_t format);
> > +const char *drm_get_format_name(uint32_t format) __malloc;
> >
> >  #endif /* __DRM_FOURCC_H__ */
> > diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> > index c1b04e9..0bf8959 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> > @@ -2071,6 +2071,7 @@ 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;
> > +       const char *format_name;
> >
> >         /* no fb bound */
> >         if (!atomic && !crtc->primary->fb) {
> > @@ -2182,8 +2183,9 @@ static int dce_v10_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;
> >         }
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> > index d4bf133..1558a97 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;
> >         }
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> > index 4fdfab1..71a0375 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> > @@ -1952,6 +1952,7 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
> >         u32 viewport_w, viewport_h;
> >         int r;
> >         bool bypass_lut = false;
> > +       const char *format_name;
> >
> >         /* no fb bound */
> >         if (!atomic && !crtc->primary->fb) {
> > @@ -2056,8 +2057,9 @@ static int dce_v8_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;
> >         }
> >
> > diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> > index fa39307..087391f 100644
> > --- a/drivers/gpu/drm/drm_atomic.c
> > +++ b/drivers/gpu/drm/drm_atomic.c
> > @@ -837,8 +837,9 @@ 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) {
> > -               DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
> > -                                drm_get_format_name(state->fb->pixel_format));
> > +               const char *format_name = drm_get_format_name(state->fb->pixel_format);
> > +               DRM_DEBUG_ATOMIC("Invalid pixel format %s\n", format_name);
> > +               kfree(format_name);
> >                 return ret;
> >         }
> >
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> > index b1dbb60..7da5d33 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -2592,8 +2592,9 @@ 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) {
> > -               DRM_DEBUG_KMS("Invalid pixel format %s\n",
> > -                             drm_get_format_name(fb->pixel_format));
> > +               const char *format_name = drm_get_format_name(fb->pixel_format);
> > +               DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
> > +               kfree(format_name);
> >                 goto out;
> >         }
> >
> > @@ -2902,8 +2903,9 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
> >                         ret = drm_plane_check_pixel_format(crtc->primary,
> >                                                            fb->pixel_format);
> >                         if (ret) {
> > -                               DRM_DEBUG_KMS("Invalid pixel format %s\n",
> > -                                       drm_get_format_name(fb->pixel_format));
> > +                               const char *format_name = drm_get_format_name(fb->pixel_format);
> > +                               DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
> > +                               kfree(format_name);
> >                                 goto out;
> >                         }
> >                 }
> > @@ -3279,6 +3281,7 @@ int drm_mode_addfb(struct drm_device *dev,
> >  static int format_check(const struct drm_mode_fb_cmd2 *r)
> >  {
> >         uint32_t format = r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN;
> > +       const char *format_name;
> >
> >         switch (format) {
> >         case DRM_FORMAT_C8:
> > @@ -3343,8 +3346,9 @@ static int format_check(const struct drm_mode_fb_cmd2 *r)
> >         case DRM_FORMAT_YVU444:
> >                 return 0;
> >         default:
> > -               DRM_DEBUG_KMS("invalid pixel format %s\n",
> > -                             drm_get_format_name(r->pixel_format));
> > +               format_name = drm_get_format_name(r->pixel_format);
> > +               DRM_DEBUG_KMS("invalid pixel format %s\n", format_name);
> > +               kfree(format_name);
> >                 return -EINVAL;
> >         }
> >  }
> > @@ -3355,8 +3359,9 @@ static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
> >
> >         ret = format_check(r);
> >         if (ret) {
> > -               DRM_DEBUG_KMS("bad framebuffer format %s\n",
> > -                             drm_get_format_name(r->pixel_format));
> > +               const char *format_name = drm_get_format_name(r->pixel_format);
> > +               DRM_DEBUG_KMS("bad framebuffer format %s\n", format_name);
> > +               kfree(format_name);
> >                 return ret;
> >         }
> >
> > diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> > index c3707d4..ac7fa02 100644
> > --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> > +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> > @@ -608,15 +608,17 @@ 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);
> > +       const char *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,
> > -                        drm_get_format_name(fb->pixel_format));
> > +                        addr, fb->width, fb->height, fmt, 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 844fea7..904720b 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -3109,6 +3109,7 @@ 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;
> > +               const char *format_name;
> >
> >                 if (!plane->state) {
> >                         seq_puts(m, "plane->state is NULL!\n");
> > @@ -3117,6 +3118,12 @@ 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);
> > +               } else {
> > +                       format_name = kstrdup("N/A", GFP_KERNEL);
> > +               }
> > +
> >                 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",
> >                            plane->base.id,
> >                            plane_type(intel_plane->base.type),
> > @@ -3130,8 +3137,10 @@ 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,
> > -                          state->fb ? drm_get_format_name(state->fb->pixel_format) : "N/A",
> > +                          format_name,
> >                            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 7de7721..e06131a 100644
> > --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> > +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> > @@ -157,6 +157,7 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
> >                 crtc_state->base.enable ? crtc_state->pipe_src_h : 0;
> >
> >         if (state->fb && intel_rotation_90_or_270(state->rotation)) {
> > +               const char *format_name;
> >                 if (!(state->fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
> >                         state->fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED)) {
> >                         DRM_DEBUG_KMS("Y/Yf tiling required for 90/270!\n");
> > @@ -171,8 +172,9 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
> >                 switch (state->fb->pixel_format) {
> >                 case DRM_FORMAT_C8:
> >                 case DRM_FORMAT_RGB565:
> > -                       DRM_DEBUG_KMS("Unsupported pixel format %s for 90/270!\n",
> > -                                       drm_get_format_name(state->fb->pixel_format));
> > +                       format_name = drm_get_format_name(state->fb->pixel_format);
> > +                       DRM_DEBUG_KMS("Unsupported pixel format %s for 90/270!\n", 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 c457eed..071399b 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -12282,6 +12282,7 @@ 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) {
> > +               const char *format_name;
> >                 intel_plane = to_intel_plane(plane);
> >                 if (intel_plane->pipe != crtc->pipe)
> >                         continue;
> > @@ -12294,11 +12295,12 @@ 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,
> > -                             drm_get_format_name(fb->pixel_format));
> > +                             fb->base.id, fb->width, fb->height, format_name);
> >                 DRM_DEBUG_KMS("\tscaler:%d src %dx%d+%d+%d dst %dx%d+%d+%d\n",
> >                               state->scaler_id,
> >                               state->src.x1 >> 16, state->src.y1 >> 16,
> > @@ -12307,6 +12309,8 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
> >                               state->dst.x1, state->dst.y1,
> >                               drm_rect_width(&state->dst),
> >                               drm_rect_height(&state->dst));
> > +
> > +               kfree(format_name);
> >         }
> >  }
> >
> > @@ -14936,6 +14940,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
> >         unsigned int aligned_height;
> >         int ret;
> >         u32 pitch_limit, stride_alignment;
> > +       const char *format_name;
> >
> >         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
> >
> > @@ -15009,16 +15014,18 @@ static int intel_framebuffer_init(struct drm_device *dev,
> >                 break;
> >         case DRM_FORMAT_XRGB1555:
> >                 if (INTEL_INFO(dev)->gen > 3) {
> > -                       DRM_DEBUG("unsupported pixel format: %s\n",
> > -                                 drm_get_format_name(mode_cmd->pixel_format));
> > +                       format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +                       DRM_DEBUG("unsupported pixel format: %s\n", format_name);
> > +                       kfree(format_name);
> >                         return -EINVAL;
> >                 }
> >                 break;
> >         case DRM_FORMAT_ABGR8888:
> >                 if (!IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) &&
> >                     INTEL_INFO(dev)->gen < 9) {
> > -                       DRM_DEBUG("unsupported pixel format: %s\n",
> > -                                 drm_get_format_name(mode_cmd->pixel_format));
> > +                       format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +                       DRM_DEBUG("unsupported pixel format: %s\n", format_name);
> > +                       kfree(format_name);
> >                         return -EINVAL;
> >                 }
> >                 break;
> > @@ -15026,15 +15033,17 @@ static int intel_framebuffer_init(struct drm_device *dev,
> >         case DRM_FORMAT_XRGB2101010:
> >         case DRM_FORMAT_XBGR2101010:
> >                 if (INTEL_INFO(dev)->gen < 4) {
> > -                       DRM_DEBUG("unsupported pixel format: %s\n",
> > -                                 drm_get_format_name(mode_cmd->pixel_format));
> > +                       format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +                       DRM_DEBUG("unsupported pixel format: %s\n", format_name);
> > +                       kfree(format_name);
> >                         return -EINVAL;
> >                 }
> >                 break;
> >         case DRM_FORMAT_ABGR2101010:
> >                 if (!IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) {
> > -                       DRM_DEBUG("unsupported pixel format: %s\n",
> > -                                 drm_get_format_name(mode_cmd->pixel_format));
> > +                       format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +                       DRM_DEBUG("unsupported pixel format: %s\n", format_name);
> > +                       kfree(format_name);
> >                         return -EINVAL;
> >                 }
> >                 break;
> > @@ -15043,14 +15052,16 @@ static int intel_framebuffer_init(struct drm_device *dev,
> >         case DRM_FORMAT_YVYU:
> >         case DRM_FORMAT_VYUY:
> >                 if (INTEL_INFO(dev)->gen < 5) {
> > -                       DRM_DEBUG("unsupported pixel format: %s\n",
> > -                                 drm_get_format_name(mode_cmd->pixel_format));
> > +                       format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +                       DRM_DEBUG("unsupported pixel format: %s\n", format_name);
> > +                       kfree(format_name);
> >                         return -EINVAL;
> >                 }
> >                 break;
> >         default:
> > -               DRM_DEBUG("unsupported pixel format: %s\n",
> > -                         drm_get_format_name(mode_cmd->pixel_format));
> > +               format_name = drm_get_format_name(mode_cmd->pixel_format);
> > +               DRM_DEBUG("unsupported pixel format: %s\n", 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 a97abc8..981ca3f 100644
> > --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> > +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> > @@ -1154,6 +1154,7 @@ static int dce4_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) {
> > @@ -1257,8 +1258,9 @@ static int dce4_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;
> >         }
> >
> > @@ -1469,6 +1471,7 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
> >         u32 viewport_w, viewport_h;
> >         int r;
> >         bool bypass_lut = false;
> > +       const char *format_name;
> >
> >         /* no fb bound */
> >         if (!atomic && !crtc->primary->fb) {
> > @@ -1558,8 +1561,9 @@ static int avivo_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;
> >         }
> >
> > --
> > 2.9.3
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch