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

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Message-ID: <CAFCwf13=M4LiNh+VK9aVZv4stnJHZ3=Oe7LT6p2E4=2O9tudkA@mail.gmail.com>
Date:   Tue, 24 Apr 2018 12:16:19 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Felix Kuehling <felix.kuehling@....com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        "Linux-Kernel@...r. Kernel. 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()

On Mon, Apr 2, 2018 at 9:02 PM, Felix Kuehling <felix.kuehling@....com> wrote:
> 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;
>>       }
>>
>

Thanks!
Applied to -fixes with the -ENODEV return code

Oded