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

[Lazar, Lijo]

On 6/6/2024 9:13 PM, Eric Huang wrote:
> 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>

Reviewed-by: Lijo Lazar <lijo.lazar at amd.com>

Thanks,
Lijo

> ---
>  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);
>  		}