[PATCH 3/3] qla2xxx: Fix Regression introduced by pci_alloc_irq_vectors_affinity call.

[Himanshu Madhani]

From: Michael Hernandez <michael.hernan...@cavium.com>

For target mode, we need to increase minimum vectors value by one to
account for ATIO queue.

Following stack trace will be seen

Call Trace:
qla24xx_config_rings+0x15a/0x230 [qla2xxx]
qla2x00_init_rings+0x1a1/0x3a0 [qla2xxx]
qla2x00_restart_isp+0x5c/0x120 [qla2xxx]
qla2x00_abort_isp+0x138/0x430 [qla2xxx]
? __schedule+0x260/0x580
qla2x00_do_dpc+0x3bc/0x920 [qla2xxx]
? qla2x00_relogin+0x290/0x290 [qla2xxx]
? schedule+0x3a/0xa0
? qla2x00_relogin+0x290/0x290 [qla2xxx]
kthread+0x103/0x140
? __kthread_init_worker+0x40/0x40
ret_from_fork+0x29/0x40

RIP: qlt_24xx_config_rings+0x6c/0x90

Fixes: 17e5fc5 ("scsi: qla2xxx: fix MSI-X vector affinity")
Signed-off-by: Michael Hernandez <michael.hernan...@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madh...@cavium.com>
---
 drivers/scsi/qla2xxx/qla_isr.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 6e0a0f1..6b324ac 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3013,14 +3013,17 @@ struct qla_init_msix_entry {
        int i, ret;
        struct qla_msix_entry *qentry;
        scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
+       int min_vecs = QLA_BASE_VECTORS;
        struct irq_affinity desc = {
                .pre_vectors = QLA_BASE_VECTORS,
        };
 
-       if (QLA_TGT_MODE_ENABLED() && IS_ATIO_MSIX_CAPABLE(ha))
+       if (QLA_TGT_MODE_ENABLED() && IS_ATIO_MSIX_CAPABLE(ha)) {
                desc.pre_vectors++;
+               min_vecs++;
+       }
 
-       ret = pci_alloc_irq_vectors_affinity(ha->pdev, QLA_BASE_VECTORS,
+       ret = pci_alloc_irq_vectors_affinity(ha->pdev, min_vecs,
                        ha->msix_count, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY,
                        &desc);
 
-- 
1.8.3.1