linux-kernel - [PATCH RFC 16/77] cciss: Update MSI/MSI-X interrupts enablement code

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Message-Id: <0498333a0ddc360d43d4496310917a5d0f9a51fd.1380703262.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:48:32 +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 16/77] cciss: 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/block/cciss.c |   17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index d2d95ff..80068a0 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4079,7 +4079,11 @@ static void cciss_interrupt_mode(ctlr_info_t *h)
 		goto default_int_mode;
 
 	if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
-		err = pci_enable_msix(h->pdev, cciss_msix_entries, 4);
+		err = pci_msix_table_size(h->pdev);
+		if (err < ARRAY_SIZE(cciss_msix_entries))
+			goto default_int_mode;
+		err = pci_enable_msix(h->pdev, cciss_msix_entries,
+				      ARRAY_SIZE(cciss_msix_entries));
 		if (!err) {
 			h->intr[0] = cciss_msix_entries[0].vector;
 			h->intr[1] = cciss_msix_entries[1].vector;
@@ -4088,15 +4092,8 @@ static void cciss_interrupt_mode(ctlr_info_t *h)
 			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)) {
 		if (!pci_enable_msi(h->pdev))
-- 
1.7.7.6

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