linux-kernel - Re: [PATCH v2] tg3: driver sleeps indefinitely when EEH errors exceed eeh_max

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Date:   Wed, 17 Jun 2020 12:07:08 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     David Christensen <drc@...ux.vnet.ibm.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tg3: driver sleeps indefinitely when EEH errors exceed eeh_max_freezes

On Wed, Jun 17, 2020 at 11:51 AM David Christensen
<drc@...ux.vnet.ibm.com> wrote:
>
> The driver function tg3_io_error_detected() calls napi_disable twice,
> without an intervening napi_enable, when the number of EEH errors exceeds
> eeh_max_freezes, resulting in an indefinite sleep while holding rtnl_lock.
>
> Add check for pcierr_recovery which skips code already executed for the
> "Frozen" state.
>
> Signed-off-by: David Christensen <drc@...ux.vnet.ibm.com>

Reviewed-by: Michael Chan <michael.chan@...adcom.com>

Thanks.