scsi: lpfc: Fix setting IRQ affinity with an empty CPU mask

commit 7ac836ebcb1509845fe7d66314f469f8e709da93 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 6637f84a3d1bccd02d6cfa226b8d5d469e3758a9..0dd6cc0ccdf2d19b0b9bed9fce9da45f763ec96f 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -11257,7 +11257,6 @@ lpfc_irq_clear_aff(struct lpfc_hba_eq_hdl *eqhdl)
 {
        cpumask_clear(&eqhdl->aff_mask);
        irq_clear_status_flags(eqhdl->irq, IRQ_NO_BALANCING);
-       irq_set_affinity_hint(eqhdl->irq, &eqhdl->aff_mask);
 }
 
 /**