1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/rv515.c b/drivers/gpu/drm/radeon/rv515.c
index 8ea1573ae820..873eb4b193b4 100644
--- a/drivers/gpu/drm/radeon/rv515.c
+++ b/drivers/gpu/drm/radeon/rv515.c
@@ -209,19 +209,27 @@ static void rv515_mc_init(struct radeon_device *rdev)
 
 uint32_t rv515_mc_rreg(struct radeon_device *rdev, uint32_t reg)
 {
+        unsigned long flags;
         uint32_t r;
 
+        spin_lock_irqsave(&rdev->mc_idx_lock, flags);
         WREG32(MC_IND_INDEX, 0x7f0000 | (reg & 0xffff));
         r = RREG32(MC_IND_DATA);
         WREG32(MC_IND_INDEX, 0);
+        spin_unlock_irqrestore(&rdev->mc_idx_lock, flags);
+
         return r;
 }
 
 void rv515_mc_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
 {
+        unsigned long flags;
+
+        spin_lock_irqsave(&rdev->mc_idx_lock, flags);
         WREG32(MC_IND_INDEX, 0xff0000 | ((reg) & 0xffff));
         WREG32(MC_IND_DATA, (v));
         WREG32(MC_IND_INDEX, 0);
+        spin_unlock_irqrestore(&rdev->mc_idx_lock, flags);
 }
 
 #if defined(CONFIG_DEBUG_FS)