Re: + hpsa-use-msleep-instead-of-schedule_timeout.patch added to -mm tree

Jiri Slaby
2009-12-08T22:25:10Z

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