linux-kernel - Re: [PATCH] scsi: lpfc: use spin_lock_irqsave instead of spin_lock

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Date:   Fri, 16 Aug 2019 11:29:08 -0700
From:   James Smart <james.smart@...adcom.com>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: lpfc: use spin_lock_irqsave instead of
 spin_lock_irq in IRQ context

On 8/12/2019 1:31 AM, Fuqian Huang wrote:
> As spin_unlock_irq will enable interrupts.
> Function lpfc_findnode_rpi is called from
>      lpfc_sli_abts_err_handler (./drivers/scsi/lpfc/lpfc_sli.c)
>   <- lpfc_sli_async_event_handler
>   <- lpfc_sli_process_unsol_iocb
>   <- lpfc_sli_handle_fast_ring_event
>   <- lpfc_sli_fp_intr_handler
>   <- lpfc_sli_intr_handler
>   and lpfc_sli_intr_handler is an interrupt handler.
> Interrupts are enabled in interrupt handler.
> Use spin_lock_irqsave/spin_unlock_irqrestore instead of spin_(un)lock_irq
> in IRQ context to avoid this.
>
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
> ---
>   drivers/scsi/lpfc/lpfc_hbadisc.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
> index 28ecaa7fc715..cf02c352b324 100644
> --- a/drivers/scsi/lpfc/lpfc_hbadisc.c
> +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
> @@ -6065,10 +6065,11 @@ lpfc_findnode_rpi(struct lpfc_vport *vport, uint16_t rpi)
>   {
>   	struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
>   	struct lpfc_nodelist *ndlp;
> +	unsigned long flags;
>   
> -	spin_lock_irq(shost->host_lock);
> +	spin_lock_irqsave(shost->host_lock, flags);
>   	ndlp = __lpfc_findnode_rpi(vport, rpi);
> -	spin_unlock_irq(shost->host_lock);
> +	spin_unlock_irqrestore(shost->host_lock, flags);
>   	return ndlp;
>   }
>   

Thank you.

Reviewed-by: James Smart <james.smart@...adcom.com>

-- james