diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 947ba22c4d86..3ec81c3d5108 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -2186,6 +2186,7 @@ bool r100_gpu_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
 void r100_bm_disable(struct radeon_device *rdev)
 {
 	u32 tmp;
+	u16 tmp16;
 
 	/* disable bus mastering */
 	tmp = RREG32(R_000030_BUS_CNTL);
@@ -2196,8 +2197,8 @@ void r100_bm_disable(struct radeon_device *rdev)
 	WREG32(R_000030_BUS_CNTL, (tmp & 0xFFFFFFFF) | 0x00000040);
 	tmp = RREG32(RADEON_BUS_CNTL);
 	mdelay(1);
-	pci_read_config_word(rdev->pdev, 0x4, (u16*)&tmp);
-	pci_write_config_word(rdev->pdev, 0x4, tmp & 0xFFFB);
+	pci_read_config_word(rdev->pdev, 0x4, &tmp16);
+	pci_write_config_word(rdev->pdev, 0x4, tmp16 & 0xFFFB);
 	mdelay(1);
 }
 
diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index ca6d5b6eaaac..803e0d3c1773 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -324,10 +324,10 @@ void rs600_hpd_fini(struct radeon_device *rdev)
 
 void rs600_bm_disable(struct radeon_device *rdev)
 {
-	u32 tmp;
+	u16 tmp;
 
 	/* disable bus mastering */
-	pci_read_config_word(rdev->pdev, 0x4, (u16*)&tmp);
+	pci_read_config_word(rdev->pdev, 0x4, &tmp);
 	pci_write_config_word(rdev->pdev, 0x4, tmp & 0xFFFB);
 	mdelay(1);
 }