[PATCH] drm/amdgpu: fix NULL pointer in amdgpu_reset_get_desc

[Eric Huang]

amdgpu_job_ring may return NULL, which causes kernel NULL
pointer error, using another way to print ring name instead
of ring->name.

Suggested-by: Lijo Lazar <Lijo.Lazar at amd.com>
Signed-off-by: Eric Huang <jinhuieric.huang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
index 9deb41d61e8d..66c1a868c0e1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
@@ -164,16 +164,14 @@ void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain)
 void amdgpu_reset_get_desc(struct amdgpu_reset_context *rst_ctxt, char *buf,
 			   size_t len)
 {
-	struct amdgpu_ring *ring;
-
 	if (!buf || !len)
 		return;
 
 	switch (rst_ctxt->src) {
 	case AMDGPU_RESET_SRC_JOB:
 		if (rst_ctxt->job) {
-			ring = amdgpu_job_ring(rst_ctxt->job);
-			snprintf(buf, len, "job hang on ring:%s", ring->name);
+			snprintf(buf, len, "job hang on ring:%s",
+				 rst_ctxt->job->base.sched->name);
 		} else {
 			strscpy(buf, "job hang", len);
 		}
-- 
2.34.1