linux-kernel - Re: [PATCH net] iavf: Do not restart Tx queues after reset task failure

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Date:   Tue, 8 Nov 2022 08:40:44 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Ivan Vecera <ivecera@...hat.com>, <netdev@...r.kernel.org>
CC:     <sassmann@...hat.com>,
        Patryk Piotrowski <patryk.piotrowski@...el.com>,
        SlawomirX Laba <slawomirx.laba@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "moderated list:INTEL ETHERNET DRIVERS" 
        <intel-wired-lan@...ts.osuosl.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] iavf: Do not restart Tx queues after reset task
 failure



On 11/8/2022 2:25 AM, Ivan Vecera wrote:
> After commit aa626da947e9 ("iavf: Detach device during reset task")
> the device is detached during reset task and re-attached at its end.
> The problem occurs when reset task fails because Tx queues are
> restarted during device re-attach and this leads later to a crash.
> 
> To resolve this issue properly close the net device in cause of
> failure in reset task to avoid restarting of tx queues at the end.
> Also replace the hacky manipulation with IFF_UP flag by device close
> that clears properly both IFF_UP and __LINK_STATE_START flags.
> In these case iavf_close() does not do anything because the adapter
> state is already __IAVF_DOWN.

Thanks for fixing this. I thought we'd removed the last such use of 
incorrect IFF_UP munging in 7d59706dbef8 ("Revert "iavf: Fix deadlock 
occurrence during resetting VF interface""), but apparently we had 
missed one...

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>