Re: [RFC v1 3/4] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn

[Eric Farman <farman@linux.ibm.com>]

On 7/2/19 10:07 AM, Farhan Ali wrote:
> 
> 
> On 07/02/2019 04:45 AM, Cornelia Huck wrote:
>> On Mon,  1 Jul 2019 12:23:45 -0400
>> Farhan Ali <alifm@linux.ibm.com> wrote:
>>
>>> So we clean up correctly.

You mean, "so we don't try to call vfio_unpin_pages()" ?

>>>
>>> Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
>>> ---
>>>   drivers/s390/cio/vfio_ccw_cp.c | 4 +++-
>>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/s390/cio/vfio_ccw_cp.c
>>> b/drivers/s390/cio/vfio_ccw_cp.c
>>> index cab1be9..c5655de 100644
>>> --- a/drivers/s390/cio/vfio_ccw_cp.c
>>> +++ b/drivers/s390/cio/vfio_ccw_cp.c
>>> @@ -72,8 +72,10 @@ static int pfn_array_alloc(struct pfn_array *pa,
>>> u64 iova, unsigned int len)
>>>                     sizeof(*pa->pa_iova_pfn) +
>>>                     sizeof(*pa->pa_pfn),
>>>                     GFP_KERNEL);
>>> -    if (unlikely(!pa->pa_iova_pfn))
>>> +    if (unlikely(!pa->pa_iova_pfn)) {
>>> +        pa->pa_nr = 0;
>>>           return -ENOMEM;
>>> +    }
>>>       pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr;
>>>         pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;
>>
>> This looks like an older error -- can you give a Fixes: tag? (Yeah, I
>> know I sound like a broken record wrt that tag... :)
>>
> Yes, this is an older error. And yup I will add a fixes tag :)

Seems okay.

Reviewed-by: Eric Farman <farman@linux.ibm.com>