[PATCH 4.5 080/200] drm/amdgpu: fix regression on CIK (v2)

[Greg Kroah-Hartman]

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Grigori Goronzy <greg@xxxxxxxxxxxx>

This fix was written against drm-next, but when it was
backported to 4.5 as a stable fix, the driver internal
structure change was missed.  Fix that up here to avoid
a hang due to waiting for the wrong sequence number.

v2: agd: fix up commit message

Signed-off-by: Grigori Goronzy <greg@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>

---
 drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
@@ -3628,7 +3628,7 @@ static void gfx_v7_0_ring_emit_vm_flush(
 					unsigned vm_id, uint64_t pd_addr)
 {
 	int usepfp = (ring->type == AMDGPU_RING_TYPE_GFX);
-	uint32_t seq = ring->fence_drv.sync_seq;
+	uint32_t seq = ring->fence_drv.sync_seq[ring->idx];
 	uint64_t addr = ring->fence_drv.gpu_addr;
 
 	amdgpu_ring_write(ring, PACKET3(PACKET3_WAIT_REG_MEM, 5));