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drm/radeon: add locking around atombios scratch space usage

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While developing MST support I noticed I often got the wrong data
back from a transaction, in a racy fashion. I noticed the scratch
space wasn't locked against concurrent users.

Based on a patch by Alex, but I've made it a bit more obvious when
things are locked.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Dave Airlie
2014-11-11 09:16:15 +10:00
committed by Alex Deucher
parent 03dca70852
commit 1c94984254
5 changed files with 19 additions and 3 deletions
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drivers/gpu/drm/radeon/radeon_device.c
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@@ -952,6 +952,7 @@ int radeon_atombios_init(struct radeon_device *rdev)
}
mutex_init(&rdev->mode_info.atom_context->mutex);
mutex_init(&rdev->mode_info.atom_context->scratch_mutex);
radeon_atom_initialize_bios_scratch_regs(rdev->ddev);
atom_allocate_fb_scratch(rdev->mode_info.atom_context);
return 0;