linux-kernel - [PATCH 4.10 066/167] scsi: qla2xxx: Fix Regression introduced by pci_alloc_irq_vectors

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Date:   Fri, 10 Mar 2017 10:08:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Michael Hernandez <michael.hernandez@...ium.com>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.10 066/167] scsi: qla2xxx: Fix Regression introduced by pci_alloc_irq_vectors_affinity call.

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Hernandez <michael.hernandez@...ium.com>

commit 67f2db8792f96d8f7521461635d25f9c80245d80 upstream.

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

[mkp: fixed Fixes: hash]

Fixes: 17e5fc58588b ("scsi: qla2xxx: fix MSI-X vector affinity")
Signed-off-by: Michael Hernandez <michael.hernandez@...ium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@...ium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_isr.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3013,14 +3013,17 @@ qla24xx_enable_msix(struct qla_hw_data *
 	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);