linux-kernel - Re: [PATCH 01/15] hisi_sas: save completion queue read pointer

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Message-ID: <b0871288-f2b4-1f73-85bb-28f7b6ad250c@suse.de>
Date:   Wed, 14 Sep 2016 13:46:32 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linuxarm@...wei.com, zhangfei.gao@...aro.org, xuwei5@...ilicon.com,
        john.garry2@...l.dcu.ie, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/15] hisi_sas: save completion queue read pointer

On 09/06/2016 05:36 PM, John Garry wrote:
> Optimise by saving an avoidable read in the cq
> interrupt.
> The queue read pointer will only be updated
> by software, so don't bother re-reading
> what was already written in the previous interrupt.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/scsi/hisi_sas/hisi_sas.h       | 1 +
>  drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 6 ++----
>  drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 5 ++---
>  3 files changed, 5 insertions(+), 7 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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