netdev - RE: [Intel-wired-lan] [PATCH net 2/3] i40e: protect ring accesses with READ- and WRITE

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Message-ID: <BN6PR1101MB21458B086C094226CC9128C38C800@BN6PR1101MB2145.namprd11.prod.outlook.com>
Date:   Thu, 11 Jun 2020 15:43:07 +0000
From:   "Bowers, AndrewX" <andrewx.bowers@...el.com>
To:     "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH net 2/3] i40e: protect ring accesses
 with READ- and WRITE_ONCE

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Ciara Loftus
> Sent: Tuesday, June 9, 2020 6:20 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; Topel, Bjorn <bjorn.topel@...el.com>;
> Karlsson, Magnus <magnus.karlsson@...el.com>
> Subject: [Intel-wired-lan] [PATCH net 2/3] i40e: protect ring accesses with
> READ- and WRITE_ONCE
> 
> READ_ONCE should be used when reading rings prior to accessing the
> statistics pointer. Introduce this as well as the corresponding WRITE_ONCE
> usage when allocating and freeing the rings, to ensure protected access.
> 
> Signed-off-by: Ciara Loftus <ciara.loftus@...el.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 29 ++++++++++++++-------
>  1 file changed, 19 insertions(+), 10 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers@...el.com>