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    • Ville Syrjälä's avatar
      drm/amdgpu: Use drm_mode_copy() · 426c89aa
      Ville Syrjälä authored
      struct drm_display_mode embeds a list head, so overwriting
      the full struct with another one will corrupt the list
      (if the destination mode is on a list). Use drm_mode_copy()
      instead which explicitly preserves the list head of
      the destination mode.
      
      Even if we know the destination mode is not on any list
      using drm_mode_copy() seems decent as it sets a good
      example. Bad examples of not using it might eventually
      get copied into code where preserving the list head
      actually matters.
      
      Obviously one case not covered here is when the mode
      itself is embedded in a larger structure and the whole
      structure is copied. But if we are careful when copying
      into modes embedded in structures I think we can be a
      little more reassured that bogus list heads haven't been
      propagated in.
      
      @is_mode_copy@
      @@
      drm_mode_copy(...)
      {
      ...
      }
      
      @depends on !is_mode_copy@
      struct drm_display_mode *mode;
      expression E, S;
      @@
      (
      - *mode = E
      + drm_mode_copy(mode, &E)
      |
      - memcpy(mode, E, S)
      + drm_mode_copy(mode, E)
      )
      
      @depends on !is_mode_copy@
      struct drm_display_mode mode;
      expression E;
      @@
      (
      - mode = E
      + drm_mode_copy(&mode, &E)
      |
      - memcpy(&mode, E, S)
      + drm_mode_copy(&mode, E)
      )
      
      @@
      struct drm_display_mode *mode;
      @@
      - &*mode
      + mode
      
      Cc: Alex Deucher <alexander.deucher@amd.com>
      Cc: Harry Wentland <harry.wentland@amd.com>
      Cc: Leo Li <sunpeng.li@amd.com>
      Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
      Cc: amd-gfx@lists.freedesktop.org
      Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
      Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
      426c89aa
    • Ville Syrjälä's avatar
      drm/radeon: Use drm_mode_copy() · 606d5877
      Ville Syrjälä authored
      struct drm_display_mode embeds a list head, so overwriting
      the full struct with another one will corrupt the list
      (if the destination mode is on a list). Use drm_mode_copy()
      instead which explicitly preserves the list head of
      the destination mode.
      
      Even if we know the destination mode is not on any list
      using drm_mode_copy() seems decent as it sets a good
      example. Bad examples of not using it might eventually
      get copied into code where preserving the list head
      actually matters.
      
      Obviously one case not covered here is when the mode
      itself is embedded in a larger structure and the whole
      structure is copied. But if we are careful when copying
      into modes embedded in structures I think we can be a
      little more reassured that bogus list heads haven't been
      propagated in.
      
      @is_mode_copy@
      @@
      drm_mode_copy(...)
      {
      ...
      }
      
      @depends on !is_mode_copy@
      struct drm_display_mode *mode;
      expression E, S;
      @@
      (
      - *mode = E
      + drm_mode_copy(mode, &E)
      |
      - memcpy(mode, E, S)
      + drm_mode_copy(mode, E)
      )
      
      @depends on !is_mode_copy@
      struct drm_display_mode mode;
      expression E;
      @@
      (
      - mode = E
      + drm_mode_copy(&mode, &E)
      |
      - memcpy(&mode, E, S)
      + drm_mode_copy(&mode, E)
      )
      
      @@
      struct drm_display_mode *mode;
      @@
      - &*mode
      + mode
      
      Cc: Alex Deucher <alexander.deucher@amd.com>
      Cc: amd-gfx@lists.freedesktop.org
      Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
      606d5877
    • Paul Menzel's avatar
      drm/amdgpu: Use ternary operator in `vcn_v1_0_start()` · 07d01469
      Paul Menzel authored
      Remove the boilerplate of declaring a variable and using an if else
      statement by using the ternary operator.
      Reviewed-by: default avatarJames Zhu <James.Zhu@amd.com>
      Signed-off-by: default avatarPaul Menzel <pmenzel@molgen.mpg.de>
      Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
      07d01469