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SubjectRe: [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@lsi.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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