linux-kernel - [PATCH RFC 57/77] pmcraid: Update MSI/MSI-X interrupts enablement code

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Message-Id: <70ae1192fb37922e07d9efe1448d902a3223921c.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:13 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>, Jon Mason <jon.mason@...el.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	linux-pci@...r.kernel.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux390@...ibm.com,
	linux-s390@...r.kernel.org, x86@...nel.org,
	linux-ide@...r.kernel.org, iss_storagedev@...com,
	linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-driver@...gic.com,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>, linux-scsi@...r.kernel.org
Subject: [PATCH RFC 57/77] pmcraid: Update MSI/MSI-X interrupts enablement code

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/scsi/pmcraid.c |   23 +++++++++++------------
 1 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 1eb7b028..5c62d22 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -4680,24 +4680,23 @@ pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
 
 	if ((pmcraid_enable_msix) &&
 		(pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
-		int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
 		struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
+		int num_hrrq = ARRAY_SIZE(entries);
 		int i;
-		for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
-			entries[i].entry = i;
-
-		rc = pci_enable_msix(pdev, entries, num_hrrq);
-		if (rc < 0)
-			goto pmcraid_isr_legacy;
 
 		/* Check how many MSIX vectors are allocated and register
 		 * msi-x handlers for each of them giving appropriate buffer
 		 */
-		if (rc > 0) {
-			num_hrrq = rc;
-			if (pci_enable_msix(pdev, entries, num_hrrq))
-				goto pmcraid_isr_legacy;
-		}
+		rc = pci_msix_table_size(pdev);
+		if (rc < 0)
+			goto pmcraid_isr_legacy;
+
+		num_hrrq = min(num_hrrq, rc);
+		for (i = 0; i < num_hrrq; i++)
+			entries[i].entry = i;
+
+		if (pci_enable_msix(pdev, entries, num_hrrq))
+			goto pmcraid_isr_legacy;
 
 		for (i = 0; i < num_hrrq; i++) {
 			pinstance->hrrq_vector[i].hrrq_id = i;
-- 
1.7.7.6

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