netdev - [PATCH RFC 31/77] hpsa: Update MSI/MSI-X interrupts enablement code

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Message-Id: <2ebbbb417719ad6501bbe59969409c1f5c63ae48.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:48:47 +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 31/77] hpsa: 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/hpsa.c |   28 +++++++++++++---------------
 1 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 393c8db..eb17b3d 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4103,34 +4103,32 @@ static void hpsa_interrupt_mode(struct ctlr_info *h)
 	int err, i;
 	struct msix_entry hpsa_msix_entries[MAX_REPLY_QUEUES];
 
-	for (i = 0; i < MAX_REPLY_QUEUES; i++) {
-		hpsa_msix_entries[i].vector = 0;
-		hpsa_msix_entries[i].entry = i;
-	}
-
 	/* Some boards advertise MSI but don't really support it */
 	if ((h->board_id == 0x40700E11) || (h->board_id == 0x40800E11) ||
 	    (h->board_id == 0x40820E11) || (h->board_id == 0x40830E11))
 		goto default_int_mode;
 	if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
 		dev_info(&h->pdev->dev, "MSIX\n");
+
+		err = pci_msix_table_size(h->pdev);
+		if (err < ARRAY_SIZE(hpsa_msix_entries))
+			goto default_int_mode;
+
+		for (i = 0; i < ARRAY_SIZE(hpsa_msix_entries); i++) {
+			hpsa_msix_entries[i].vector = 0;
+			hpsa_msix_entries[i].entry = i;
+		}
+
 		err = pci_enable_msix(h->pdev, hpsa_msix_entries,
-						MAX_REPLY_QUEUES);
+				      ARRAY_SIZE(hpsa_msix_entries));
 		if (!err) {
 			for (i = 0; i < MAX_REPLY_QUEUES; i++)
 				h->intr[i] = hpsa_msix_entries[i].vector;
 			h->msix_vector = 1;
 			return;
 		}
-		if (err > 0) {
-			dev_warn(&h->pdev->dev, "only %d MSI-X vectors "
-			       "available\n", err);
-			goto default_int_mode;
-		} else {
-			dev_warn(&h->pdev->dev, "MSI-X init failed %d\n",
-			       err);
-			goto default_int_mode;
-		}
+		dev_warn(&h->pdev->dev, "MSI-X init failed %d\n", err);
+		goto default_int_mode;
 	}
 	if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {
 		dev_info(&h->pdev->dev, "MSI\n");
-- 
1.7.7.6

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