[PATCH 1/2] drm/amdgpu: Fix sigsev when accessing MMIO on hot unplug.

[Christian König]

Am 01.03.22 um 19:07 schrieb Andrey Grodzovsky:
> Protect with drm_dev_enter/exit
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com> for this one here.

Regarding the version bumb you should probably sync up with Alex.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> index f522b52725e4..4294f17cedcb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
> @@ -23,6 +23,7 @@
>    */
>   
>   #include <drm/drm_auth.h>
> +#include <drm/drm_drv.h>
>   #include "amdgpu.h"
>   #include "amdgpu_sched.h"
>   #include "amdgpu_ras.h"
> @@ -339,7 +340,7 @@ static void amdgpu_ctx_fini(struct kref *ref)
>   {
>   	struct amdgpu_ctx *ctx = container_of(ref, struct amdgpu_ctx, refcount);
>   	struct amdgpu_device *adev = ctx->adev;
> -	unsigned i, j;
> +	unsigned i, j, idx;
>   
>   	if (!adev)
>   		return;
> @@ -350,7 +351,12 @@ static void amdgpu_ctx_fini(struct kref *ref)
>   			ctx->entities[i][j] = NULL;
>   		}
>   	}
> -	amdgpu_ctx_set_stable_pstate(ctx, AMDGPU_CTX_STABLE_PSTATE_NONE);
> +
> +	if (drm_dev_enter(&adev->ddev, &idx)) {
> +		amdgpu_ctx_set_stable_pstate(ctx, AMDGPU_CTX_STABLE_PSTATE_NONE);
> +		drm_dev_exit(idx);
> +	}
> +
>   	kfree(ctx);
>   }
>