From: Monk Liu <Monk.Liu@amd.com>
Date: Tue, 17 Oct 2017 19:18:56 +0800
Subject: drm/amdgpu:fix wb_clear
Git-commit: 63ae07ca4fb4adcacc19272b05b5c3d398e94a56
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Properly shift the index when clearing so we clear
the right bit

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -546,7 +546,7 @@ int amdgpu_wb_get(struct amdgpu_device *
 
 	if (offset < adev->wb.num_wb) {
 		__set_bit(offset, adev->wb.used);
-		*wb = offset * 8; /* convert to dw offset */
+		*wb = offset << 3; /* convert to dw offset */
 		return 0;
 	} else {
 		return -EINVAL;
@@ -564,7 +564,7 @@ int amdgpu_wb_get(struct amdgpu_device *
 void amdgpu_wb_free(struct amdgpu_device *adev, u32 wb)
 {
 	if (wb < adev->wb.num_wb)
-		__clear_bit(wb, adev->wb.used);
+		__clear_bit(wb >> 3, adev->wb.used);
 }
 
 /**