netdev - Re: [PATCH v2 2/2] ibmvnic: fix race with multiple open/close

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Date:   Wed, 3 Feb 2021 13:40:23 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Dany Madden <drt@...ux.ibm.com>, Lijun Pan <ljp@...ux.ibm.com>,
        Rick Lindsley <ricklind@...ux.ibm.com>, abdhalee@...ibm.com
Subject: Re: [PATCH v2 2/2] ibmvnic: fix race with multiple open/close

On Wed, Feb 3, 2021 at 12:10 AM Sukadev Bhattiprolu
<sukadev@...ux.ibm.com> wrote:
>
> If two or more instances of 'ip link set' commands race and first one
> already brings the interface up (or down), the subsequent instances
> can simply return without redoing the up/down operation.
>
> Fixes: ed651a10875f ("ibmvnic: Updated reset handling")
> Reported-by: Abdul Haleem <abdhalee@...ibm.com>
> Tested-by: Abdul Haleem <abdhalee@...ibm.com>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
>
> ---
> Changelog[v2] For consistency with ibmvnic_open() use "goto out" and return
>               from end of function.

Did you find the code path that triggers this?

In v1 we discussed how the usual ip link path should not call the
driver twice based on IFF_UP.