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

[Andrey Grodzovsky]

Thanks, already did. Code pushed both here and in libdrm.

Andrey

On 2022-03-02 03:37, Christian König wrote:
> 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);
>>   }
>