X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fradeon%2Frs400.c;h=9566b5940a5ae723f90dfa11427e3f09bac233b3;hb=75ae83d6869a443ee509dcce2b432c9d37516051;hp=b8074a8ec75a93c0566cfefa5ae5375041841e18;hpb=a4ae54f90e0a7063799eb90852aa8648ccfbb791;p=~andy%2Flinux

diff --git a/drivers/gpu/drm/radeon/rs400.c b/drivers/gpu/drm/radeon/rs400.c
index b8074a8ec75..9566b5940a5 100644
--- a/drivers/gpu/drm/radeon/rs400.c
+++ b/drivers/gpu/drm/radeon/rs400.c
@@ -274,19 +274,26 @@ static void rs400_mc_init(struct radeon_device *rdev)
 
 uint32_t rs400_mc_rreg(struct radeon_device *rdev, uint32_t reg)
 {
+	unsigned long flags;
 	uint32_t r;
 
+	spin_lock_irqsave(&rdev->mc_idx_lock, flags);
 	WREG32(RS480_NB_MC_INDEX, reg & 0xff);
 	r = RREG32(RS480_NB_MC_DATA);
 	WREG32(RS480_NB_MC_INDEX, 0xff);
+	spin_unlock_irqrestore(&rdev->mc_idx_lock, flags);
 	return r;
 }
 
 void rs400_mc_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&rdev->mc_idx_lock, flags);
 	WREG32(RS480_NB_MC_INDEX, ((reg) & 0xff) | RS480_NB_MC_IND_WR_EN);
 	WREG32(RS480_NB_MC_DATA, (v));
 	WREG32(RS480_NB_MC_INDEX, 0xff);
+	spin_unlock_irqrestore(&rdev->mc_idx_lock, flags);
 }
 
 #if defined(CONFIG_DEBUG_FS)