linux-kernel - [PATCH 3.12 10/66] PCI/MSI: Return msix_capability_init() failure if populate_msi

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Date:	Sat,  6 Dec 2014 16:07:02 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 10/66] PCI/MSI: Return msix_capability_init() failure if populate_msi_sysfs() fails

From: Alexander Gordeev <agordeev@...hat.com>

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

===============

commit 2adc7907bac2c72535894732c4b41f9210f9e577 upstream.

If populate_msi_sysfs() function failed msix_capability_init() must return
the error code, but it returns the success instead.  This update fixes the
described misbehaviour.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Tejun Heo <tj@...nel.org>

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/pci/msi.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d5f90d6383bc..b43f391dc8b6 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -719,7 +719,7 @@ static int msix_capability_init(struct pci_dev *dev,
 
 	ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
 	if (ret)
-		goto error;
+		goto out_avail;
 
 	/*
 	 * Some devices require MSI-X to be enabled before we can touch the
@@ -732,10 +732,8 @@ static int msix_capability_init(struct pci_dev *dev,
 	msix_program_entries(dev, entries);
 
 	ret = populate_msi_sysfs(dev);
-	if (ret) {
-		ret = 0;
-		goto error;
-	}
+	if (ret)
+		goto out_free;
 
 	/* Set MSI-X enabled bits and unmask the function */
 	pci_intx_for_msi(dev, 0);
@@ -746,7 +744,7 @@ static int msix_capability_init(struct pci_dev *dev,
 
 	return 0;
 
-error:
+out_avail:
 	if (ret < 0) {
 		/*
 		 * If we had some success, report the number of irqs
@@ -763,6 +761,7 @@ error:
 			ret = avail;
 	}
 
+out_free:
 	free_msi_irqs(dev);
 
 	return ret;
-- 
2.1.3

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