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drm/amd/display: Fix use before NULL check in validate_timing

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Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_timing_generator.c:1124
dce110_timing_generator_validate_timing() warn: variable dereferenced
before check 'timing' (see line 1116)

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harry Wentland 2017-11-10 12:11:44 -05:00 committed by Alex Deucher
parent a8f9764731
commit b001965d4e
1 changed files with 4 additions and 4 deletions
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8
drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
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@ -1112,10 +1112,7 @@ bool dce110_timing_generator_validate_timing(
enum signal_type signal)
{
uint32_t h_blank;
uint32_t h_back_porch;
uint32_t hsync_offset = timing->h_border_right +
timing->h_front_porch;
uint32_t h_sync_start = timing->h_addressable + hsync_offset;
uint32_t h_back_porch, hsync_offset, h_sync_start;
struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
@ -1124,6 +1121,9 @@ bool dce110_timing_generator_validate_timing(
if (!timing)
return false;
hsync_offset = timing->h_border_right + timing->h_front_porch;
h_sync_start = timing->h_addressable + hsync_offset;
/* Currently we don't support 3D, so block all 3D timings */
if (timing->timing_3d_format != TIMING_3D_FORMAT_NONE)
return false;