[PATCH] drm/amd/powerplay: fix pcie sysfs interface when set wrong value

[likun Gao]

From: Likun Gao <Likun.Gao at amd.com>

The operation of mutex_unlock smu->mutex should be done when forced level is larger than NUM_LINK_LEVELS in the function of force_clk_levels.

Reported-by: Julia Lawall <julia.lawall at lip6.fr>
Signed-off-by: Likun Gao <Likun.Gao at amd.com>
---
 drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
index f7188a7..4b1fc45 100644
--- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
@@ -1206,8 +1206,10 @@ static int vega20_force_clk_levels(struct smu_context *smu,
 
 	case PP_PCIE:
 		if (soft_min_level >= NUM_LINK_LEVELS ||
-		    soft_max_level >= NUM_LINK_LEVELS)
-			return -EINVAL;
+		    soft_max_level >= NUM_LINK_LEVELS) {
+			ret = -EINVAL;
+			break;
+		}
 
 		ret = smu_send_smc_msg_with_param(smu,
 				SMU_MSG_SetMinLinkDpmByIndex, soft_min_level);
-- 
2.7.4