linux-kernel - Re: + hpsa-use-msleep-instead-of-schedule

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Message-ID: <4B1ED241.4090803@gmail.com>
Date:	Tue, 08 Dec 2009 23:25:05 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	scameron@...rdog.cce.hp.com, James.Bottomley@...senPartnership.com,
	achiang@...com, jens.axboe@...cle.com, mikem@...rdog.cce.hp.com
Subject: Re: + hpsa-use-msleep-instead-of-schedule_timeout.patch added to
 -mm tree

On 12/08/2009 11:04 PM, akpm@...ux-foundation.org wrote:
> Subject: hpsa: use msleep() instead of schedule_timeout
> From: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
> 
> Use msleep() instead of schedule_timeout

The patch does more than that and moreover in a wrong manner, see below.

> @@ -3262,8 +3262,8 @@ static int hpsa_pci_init(struct ctlr_inf
>  		if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
>  			break;
>  		/* delay and try again */
> -		set_current_state(TASK_INTERRUPTIBLE);
> -		schedule_timeout(10);
> +		set_current_state(TASK_UNINTERRUPTIBLE);
> +		msleep(10);

Why do you change interruptible sleep to uninterruptible? And you
intermix jiffies with msecs. Use schedule_timeout_interruptible(10).

> @@ -3302,7 +3302,8 @@ static int __devinit hpsa_init_one(struc
>  
>  		/* Some devices (notably the HP Smart Array 5i Controller)
>  		   need a little pause here */
> -		schedule_timeout_uninterruptible(HPSA_POST_RESET_PAUSE);
> +		set_current_state(TASK_UNINTERRUPTIBLE);
> +		msleep(HPSA_POST_RESET_PAUSE_MSECS);

Hmm, setting the state is superfluous, as msleep does the job itself.

> diff -puN drivers/scsi/hpsa.h~hpsa-use-msleep-instead-of-schedule_timeout drivers/scsi/hpsa.h
> --- a/drivers/scsi/hpsa.h~hpsa-use-msleep-instead-of-schedule_timeout
> +++ a/drivers/scsi/hpsa.h
...
> @@ -139,7 +139,7 @@ struct ctlr_info {
>  #define HPSA_BOARD_READY_ITERATIONS \
>  	((HPSA_BOARD_READY_WAIT_SECS * 1000) / \
>  		HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
> -#define HPSA_POST_RESET_PAUSE (30 * HZ)
> +#define HPSA_POST_RESET_PAUSE_MSECS (3000)

Ehm?

-- 
js
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