Re: [dpdk-dev] [dpdk-stable] [PATCH 1/2] vfio: fix check for vfio_group_fd

[David Marchand <david.marchand@redhat.com>]

On Thu, May 21, 2020 at 2:54 PM Burakov, Anatoly
<anatoly.burakov@intel.com> wrote:
>
> On 19-May-20 8:43 AM, David Marchand wrote:
> > On Tue, May 19, 2020 at 5:42 AM wangyunjian <wangyunjian@huawei.com> wrote:
> >>
> >> From: Yunjian Wang <wangyunjian@huawei.com>
> >>
> >> The issue is that a file descriptor at 0 is a valid one. Currently
> >> the file not found, the return value will be set to 0. As a result,
> >> it is impossible to distinguish between a correct descriptor and a
> >> failed return value. Fix it to return -ENOENT instead of 0.
> >>
> >> Fixes: b758423bc4fe ("vfio: fix race condition with sysfs")
> >> Fixes: ff0b67d1c868 ("vfio: DMA mappinge")
> >> Cc: stable@dpdk.org
> >
> > This patch reverts the (marked for stable) fix b758423bc4fe ("vfio:
> > fix race condition with sysfs") and comes with a different fix.
> >
> > - Kevin, Luca, I would put this b758423bc4fe backport on hold.
> >
> > - Anatoly, I don't want to put 20.05 at risk.
> > My simple question for 20.05 is, should we revert b758423bc4fe?
>
> No, let's not revert anything.
>
> As far as i can tell, this patch is a more complete fix, but it
> essentially does the same thing, just in a different (and better) way.
> Still, i haven't reviewed it in detail.
>
> >
> > - This patchset will go to 20.08 as I don't feel confident in taking it now.
> >
>
> Yes, let's leave it for 20.08.

Thanks for the analysis Anatoly.


-- 
David Marchand