drm/amd/display: Use atomic types for ref_count

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Current ref_count inc/dec is not guarded by locks which leads to
a raced condition where two threads try to access the variable
at the same time. In this case, both might act on the same cached
value and inc/dec from the same value, rather than inc/dec by 2.

Signed-off-by: Jerry Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Jerry Zuo 2017-07-31 17:10:44 -04:00 • committed by Alex Deucher

parent f81483c4cc

commit e8cd26434d

8 changed files with 49 additions and 51 deletions

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24

drivers/gpu/drm/amd/display/dc/core/dc.c

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2

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

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12

drivers/gpu/drm/amd/display/dc/core/dc_sink.c

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14

drivers/gpu/drm/amd/display/dc/core/dc_stream.c

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36

drivers/gpu/drm/amd/display/dc/core/dc_surface.c

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8

drivers/gpu/drm/amd/display/dc/dc.h

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2

drivers/gpu/drm/amd/display/dc/dc_hw_types.h

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2

drivers/gpu/drm/amd/display/dc/inc/core_types.h

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