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

[David Marchand]

On Tue, May 19, 2020 at 5:42 AM wangyunjian <wangyunjian at huawei.com> wrote:
>
> From: Yunjian Wang <wangyunjian at 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 at 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?

- This patchset will go to 20.08 as I don't feel confident in taking it now.


-- 
David Marchand