[dpdk-stable] missing ring memory barrier in 17.11

[Gavin Hu (Arm Technology China)]

Hi Thomas, Luca,

Thanks for reminding and sorry for late response(due to long holiday).

I have ported the patch and already sent to the stable mailing list, please help check and merge, thanks!

Best Regards,
Gavin

> -----Original Message-----
> From: Thomas Monjalon <thomas at monjalon.net>
> Sent: Tuesday, October 1, 2019 3:42 PM
> To: bluca at debian.org; Gavin Hu (Arm Technology China)
> <Gavin.Hu at arm.com>
> Cc: stable at dpdk.org; Honnappa Nagarahalli
> <Honnappa.Nagarahalli at arm.com>; Nipun.gupta at nxp.com; Konstantin
> Ananyev <konstantin.ananyev at intel.com>
> Subject: missing ring memory barrier in 17.11
>
> Hi Luca, Gavin,
>
> It seems the fix 85cffb2eccd9 ("ring: enforce reading tail before slots")
> should be backported in 17.11.
>
> This patch is missing because the root cause is wrongly identified.
> It is referenced as
>       Fixes: c9fb3c62896f ("ring: move code in a new header file")
> in 18.02, but in reality it is from 17.05:
>       Fixes: 0dfc98c507b1 ("ring: separate out head index manipulation")
>
> Do you agree?
>

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