From: James Smart <james.smart@broadcom.com>
Date: Fri, 28 Aug 2020 10:53:29 -0700
Subject: scsi: lpfc: Fix setting IRQ affinity with an empty CPU mask
Patch-mainline: v5.9 or v5.9-rc5 (next release)
Git-commit: 7ac836ebcb1509845fe7d66314f469f8e709da93
References: git-fixes

Some systems are reporting the following log message during driver unload
or system shutdown:

  ics_rtas_set_affinity: No online cpus in the mask

A prior commit introduced the writing of an empty affinity mask in calls to
irq_set_affinity_hint() when disabling interrupts or when there are no
remaining online CPUs to service an eq interrupt. At least some ppc64
systems are checking whether affinity masks are empty or not.

Do not call irq_set_affinity_hint() with an empty CPU mask.

Fixes: dcaa21367938 ("scsi: lpfc: Change default IRQ model on AMD architectures")
Link: https://lore.kernel.org/r/20200828175332.130300-2-james.smart@broadcom.com
Cc: <stable@vger.kernel.org> # v5.5+
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/lpfc/lpfc_init.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -11379,7 +11379,6 @@ lpfc_irq_clear_aff(struct lpfc_hba_eq_hd
 {
 	cpumask_clear(&eqhdl->aff_mask);
 	irq_clear_status_flags(eqhdl->irq, IRQ_NO_BALANCING);
-	irq_set_affinity_hint(eqhdl->irq, &eqhdl->aff_mask);
 }
 
 /**