linux-kernel - Re: [PATCH -next] drm/amdkfd: Fix the error return code in kfd_ioctl_unmap_memory_from

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Date:   Mon, 2 Apr 2018 14:02:53 -0400
From:   Felix Kuehling <felix.kuehling@....com>
To:     Wei Yongjun <weiyongjun1@...wei.com>, oded.gabbay@...il.com,
        alexander.deucher@....com, christian.koenig@....com,
        David1.Zhou@....com, airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -next] drm/amdkfd: Fix the error return code in
 kfd_ioctl_unmap_memory_from_gpu()

Thanks for catching that. I'd use -ENODEV to match what is done a few
lines below for peer_pdd. With that fixed, this patch is Reviewed-by:
Felix Kuehling <Felix.Kuehling@....com>

Regards,
  Felix


On 2018-03-29 10:25 PM, Wei Yongjun wrote:
> Passing NULL pointer to PTR_ERR will result in return value of 0
> indicating success which is clearly not what it is intended here.
> This patch returns -EINVAL instead.
>
> Fixes: 5ec7e02854b3 ("drm/amdkfd: Add ioctls for GPUVM memory management")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index cd679cf..c32a341 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1421,7 +1421,7 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
>  
>  	pdd = kfd_get_process_device_data(dev, p);
>  	if (!pdd) {
> -		err = PTR_ERR(pdd);
> +		err = -EINVAL;
>  		goto bind_process_to_device_failed;
>  	}
>