linux-kernel - Re: [PATCH 3/6] scsi: megaraid_sas

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Date:	Thu, 15 Feb 2007 09:09:42 +0100
From:	Richard Knutsson <ricknu-0@...dent.ltu.se>
To:	Sumant Patro <sumantp@...l.com>
CC:	James.Bottomley@...elEye.com, akpm@...l.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	neela.kolli@....com, bo.yang@....com, sumant.patro@....com
Subject: Re: [PATCH 3/6] scsi: megaraid_sas - throttle io if FW is busy

Sumant Patro wrote:
> Checks added in megasas_queue_command to know if FW is able to process
> commands within the timeout period. If number of retries is 2 or more,
> the driver stops sending cmd to FW. IO is resumed when pending cmd count 
> reduces to 16 or 10 seconds has elapsed from the time cmds were last 
> sent to FW.
>
> Signed-off-by: Sumant Patro <sumant.patro@....com>
> ---
>
>  drivers/scsi/megaraid/megaraid_sas.c |   27 +++++++++++++++++++++++++
>  drivers/scsi/megaraid/megaraid_sas.h |    3 ++
>  2 files changed, 30 insertions(+)
>
>   
[snip]
> diff -uprN linux-feb13-new-p2/drivers/scsi/megaraid/megaraid_sas.h linux-feb13-new-p3/drivers/scsi/megaraid/megaraid_sas.h
> --- linux-feb13-new-p2/drivers/scsi/megaraid/megaraid_sas.h	2007-02-13 07:22:40.000000000 -0800
> +++ linux-feb13-new-p3/drivers/scsi/megaraid/megaraid_sas.h	2007-02-13 11:37:09.000000000 -0800
> @@ -1102,6 +1102,9 @@ struct megasas_instance {
>  	atomic_t fw_outstanding;
>  	u32 hw_crit_error;
>  
> +	u8 is_busy;
>   
Why not "bool is_busy:8;"? It obviously is a boolean. I would also think 
false/true would be more descriptive then 0/1.

Richard Knutsson

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