On Tue, 2021-03-23 at 10:27 -0700, lduncan@xxxxxxxx wrote:
> From: Lee Duncan <lduncan@xxxxxxxx>
>
> Commit b43abcbbd5b1 ("scsi: fnic: Ratelimit printks to avoid
> looding when vlan is not set by the switch.i") added
> printk_ratelimit() in front of a couple of debug-mode
> messages, to reduce logging overrun when debugging the
> driver. The code:
>
> > if (printk_ratelimit())
> > FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
> > "Start VLAN Discovery\n");
>
> ends up calling printk_ratelimit() quite often, triggering
> many kernel messages about callbacks being surpressed.
>
> The fix is to decompose FNIC_FCS_DBG(), then change the order
> of checks so that printk_ratelimit() is only called if
> driver debugging is enabled.
>
> Signed-off-by: Lee Duncan <lduncan@xxxxxxxx>
> ---
> drivers/scsi/fnic/fnic_fcs.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/fnic/fnic_fcs.c
> b/drivers/scsi/fnic/fnic_fcs.c
> index e0cee4dcb439..332b31493e79 100644
> --- a/drivers/scsi/fnic/fnic_fcs.c
> +++ b/drivers/scsi/fnic/fnic_fcs.c
> @@ -1343,9 +1343,10 @@ void fnic_handle_fip_timer(struct fnic *fnic)
> if (list_empty(&fnic->vlans)) {
> spin_unlock_irqrestore(&fnic->vlans_lock, flags);
> /* no vlans available, try again */
> - if (printk_ratelimit())
> - FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
> - "Start VLAN Discovery\n");
> + if (unlikely(fnic_log_level & FNIC_FCS_LOGGING))
> + if (printk_ratelimit())
> + shost_printk(KERN_DEBUG, fnic->lport-
> >host,
> + "Start VLAN
> Discovery\n");
> fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
> return;
> }
> @@ -1363,9 +1364,10 @@ void fnic_handle_fip_timer(struct fnic *fnic)
> case FIP_VLAN_FAILED:
> spin_unlock_irqrestore(&fnic->vlans_lock, flags);
> /* if all vlans are in failed state, restart vlan disc
> */
> - if (printk_ratelimit())
> - FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
> - "Start VLAN Discovery\n");
> + if (unlikely(fnic_log_level & FNIC_FCS_LOGGING))
> + if (printk_ratelimit())
> + shost_printk(KERN_DEBUG, fnic->lport-
> >host,
> + "Start VLAN Discovery\n");
> fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
> break;
> case FIP_VLAN_SENT:
This looks good to me.
Reviewed-by: Laurence Oberman <loberman@xxxxxxxxxx>
