Re: [PATCH 01/14] scsi: pm80xx: Do not sleep in atomic context.

Jinpu Wang
2020-11-26T13:58:58Z

On Thu, Nov 26, 2020 at 2:30 PM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
>
> hw_event_sas_phy_up() is used in hardirq/softirq context:
>
> pm8001_interrupt_handler_msix() || pm8001_interrupt_handler_intx() || pm8001_tasklet
> => PM8001_CHIP_DISP->isr() = pm80xx_chip_isr()
> => process_oq() [spin_lock_irqsave(&pm8001_ha->lock,)]
> => process_one_iomb()
> => mpi_hw_event()
> => hw_event_sas_phy_up()
> => msleep(200)
>
> Revert the msleep() back to an mdelay() to avoid sleeping in atomic
> context.
>
> Fixes: 4daf1ef3c681 ("scsi: pm80xx: Convert 'long' mdelay to msleep")
> Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: Vikram Auradkar <auradkar@google.com>
> Cc: Jack Wang <jinpu.wang@cloud.ionos.com>
Indeed, thx for the fix.
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>> ---
> drivers/scsi/pm8001/pm80xx_hwi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
> index 69f8244539e04..7d838e316657c 100644
> --- a/drivers/scsi/pm8001/pm80xx_hwi.c
> +++ b/drivers/scsi/pm8001/pm80xx_hwi.c
> @@ -3296,7 +3296,7 @@ hw_event_sas_phy_up(struct pm8001_hba_info *pm8001_ha, void *piomb)
> pm8001_get_attached_sas_addr(phy, phy->sas_phy.attached_sas_addr);
> spin_unlock_irqrestore(&phy->sas_phy.frame_rcvd_lock, flags);
> if (pm8001_ha->flags == PM8001F_RUN_TIME)
> - msleep(200);/*delay a moment to wait disk to spinup*/
> + mdelay(200);/*delay a moment to wait disk to spinup*/
> pm8001_bytes_dmaed(pm8001_ha, phy_id);
> }
>
> --
> 2.29.2
>