linux-kernel - [PATCH v2 1/9] ahci: Fix broken fallback to single MSI mode

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Date:	Fri, 17 Jan 2014 17:02:15 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>, Tejun Heo <tj@...nel.org>,
	linux-ide@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH v2 1/9] ahci: Fix broken fallback to single MSI mode

Commit 7b92b4f ("PCI/MSI: Remove pci_enable_msi_block_auto()")
introduced a regression - in case multiple MSIs initialization
fails the code falls back to INTx rather than to single MSI.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/ata/ahci.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 8516f4d..df24eef4 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1117,8 +1117,10 @@ int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
 
 	nvec = rc;
 	rc = pci_enable_msi_block(pdev, nvec);
-	if (rc)
+	if (rc < 0)
 		goto intx;
+	else if (rc > 0)
+		goto single_msi;
 
 	return nvec;
 
-- 
1.7.7.6

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