linux-kernel - [PATCH 3.13 102/160] irqchip: armada-370-xp: Fix releasing of MSIs

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Message-Id: <1402429600-20477-103-git-send-email-kamal@canonical.com>
Date:	Tue, 10 Jun 2014 12:45:42 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Neil Greatorex <neil@...boyfat.co.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 102/160] irqchip: armada-370-xp: Fix releasing of MSIs

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

------------------

From: Neil Greatorex <neil@...boyfat.co.uk>

commit ff3c664505bf8a8334bca5045e87b85cfe4d2277 upstream.

Store the value of d->hwirq in a local variable as the real value is wiped out
by calling irq_dispose_mapping. Without this patch, the armada_370_xp_free_msi
function would always free MSI#0, no matter what was passed to it.

Fixes: 31f614edb726fcc4d5aa0f2895fbdec9b04a3ca4 ('irqchip: armada-370-xp: implement MSI support')
Signed-off-by: Neil Greatorex <neil@...boyfat.co.uk>
Link: https://lkml.kernel.org/r/1397823593-1932-4-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Link: https://lkml.kernel.org/r/1397823593-1932-4-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/irqchip/irq-armada-370-xp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 6cb87c4..d9cd6df 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -158,8 +158,10 @@ static void armada_370_xp_teardown_msi_irq(struct msi_chip *chip,
 					   unsigned int irq)
 {
 	struct irq_data *d = irq_get_irq_data(irq);
+	unsigned long hwirq = d->hwirq;
+
 	irq_dispose_mapping(irq);
-	armada_370_xp_free_msi(d->hwirq);
+	armada_370_xp_free_msi(hwirq);
 }
 
 static int armada_370_xp_check_msi_device(struct msi_chip *chip, struct pci_dev *dev,
-- 
1.9.1

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