[PATCH] drm/radeon: Make sure radeon_vm_bo_set_addr always unreserves the BO

[Christian König]

On 11.06.2015 11:38, Michel Dänzer wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Some error paths didn't unreserve the BO. This resulted in a deadlock
> down the road on the next attempt to reserve the (still reserved) BO.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90873
> Cc: stable at vger.kernel.org
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

I've already did the same change for amdgpu. Looks like I've forgotten 
to port it back to Radeon, crap!

Patch is Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/radeon/radeon_vm.c | 17 ++++++++++++-----
>   1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
> index de42fc4..9c3377c 100644
> --- a/drivers/gpu/drm/radeon/radeon_vm.c
> +++ b/drivers/gpu/drm/radeon/radeon_vm.c
> @@ -458,14 +458,16 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   		/* make sure object fit at this offset */
>   		eoffset = soffset + size;
>   		if (soffset >= eoffset) {
> -			return -EINVAL;
> +			r = -EINVAL;
> +			goto error_unreserve;
>   		}
>   
>   		last_pfn = eoffset / RADEON_GPU_PAGE_SIZE;
>   		if (last_pfn > rdev->vm_manager.max_pfn) {
>   			dev_err(rdev->dev, "va above limit (0x%08X > 0x%08X)\n",
>   				last_pfn, rdev->vm_manager.max_pfn);
> -			return -EINVAL;
> +			r = -EINVAL;
> +			goto error_unreserve;
>   		}
>   
>   	} else {
> @@ -486,7 +488,8 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   				"(bo %p 0x%010lx 0x%010lx)\n", bo_va->bo,
>   				soffset, tmp->bo, tmp->it.start, tmp->it.last);
>   			mutex_unlock(&vm->mutex);
> -			return -EINVAL;
> +			r = -EINVAL;
> +			goto error_unreserve;
>   		}
>   	}
>   
> @@ -497,7 +500,8 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   			tmp = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
>   			if (!tmp) {
>   				mutex_unlock(&vm->mutex);
> -				return -ENOMEM;
> +				r = -ENOMEM;
> +				goto error_unreserve;
>   			}
>   			tmp->it.start = bo_va->it.start;
>   			tmp->it.last = bo_va->it.last;
> @@ -555,7 +559,6 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   		r = radeon_vm_clear_bo(rdev, pt);
>   		if (r) {
>   			radeon_bo_unref(&pt);
> -			radeon_bo_reserve(bo_va->bo, false);
>   			return r;
>   		}
>   
> @@ -575,6 +578,10 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   
>   	mutex_unlock(&vm->mutex);
>   	return 0;
> +
> +error_unreserve:
> +	radeon_bo_unreserve(bo_va->bo);
> +	return r;
>   }
>   
>   /**