diff options
| author | Christian König <deathsimple@vodafone.de> | 2012-07-09 08:52:39 (GMT) |
|---|---|---|
| committer | Christian König <deathsimple@vodafone.de> | 2012-07-17 08:32:15 (GMT) |
| commit | bf66625e02ac8e4535627394bcfb237bbf8a157f (patch) | |
| tree | e1d10c50e0a3c803a3e00af4c7f99d8ed454a80a /drivers/gpu/drm/radeon/radeon_fence.c | |
| parent | 07a713305a2b55d6ec424000f2c5bed1268ac56b (diff) | |
| download | linux-bf66625e02ac8e4535627394bcfb237bbf8a157f.tar.xz | |
drm/radeon: fix fence value access
It is possible that radeon_fence_process is called
after writeback is disabled for suspend, leading
to an invalid read of register 0x0.
This fixes a problem for me where the fence value
is temporary incremented by 0x100000000 on
suspend/resume.
Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_fence.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_fence.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index be4e4f3..a194a14 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -42,21 +42,23 @@ static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring) { - if (rdev->wb.enabled) { - *rdev->fence_drv[ring].cpu_addr = cpu_to_le32(seq); + struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; + if (likely(rdev->wb.enabled || !drv->scratch_reg)) { + *drv->cpu_addr = cpu_to_le32(seq); } else { - WREG32(rdev->fence_drv[ring].scratch_reg, seq); + WREG32(drv->scratch_reg, seq); } } static u32 radeon_fence_read(struct radeon_device *rdev, int ring) { + struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; u32 seq = 0; - if (rdev->wb.enabled) { - seq = le32_to_cpu(*rdev->fence_drv[ring].cpu_addr); + if (likely(rdev->wb.enabled || !drv->scratch_reg)) { + seq = le32_to_cpu(*drv->cpu_addr); } else { - seq = RREG32(rdev->fence_drv[ring].scratch_reg); + seq = RREG32(drv->scratch_reg); } return seq; } |