linux-kernel - Re: [PATCH v3 21/77] ncr5380: Sleep when polling, if possible

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Message-ID: <5678F7C4.4070205@suse.de>
Date:	Tue, 22 Dec 2015 08:12:04 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Finn Thain <fthain@...egraphics.com.au>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	Michael Schmitz <schmitzmic@...il.com>,
	linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v3 21/77] ncr5380: Sleep when polling, if possible

On 12/22/2015 02:17 AM, Finn Thain wrote:
> When in process context, sleep during polling if doing so won't add
> significant latency. In interrupt context or if the lock is held, poll
> briefly then give up. Keep both core drivers in sync.
>
> Calibrate busy-wait iterations to allow for variation in chip register
> access times between different 5380 hardware implementations.
>
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
>
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
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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