linux-kernel - [PATCH 1/2] memory: tegra20-mc: Fix hang in IRQ handler.

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Date:	Mon, 10 Jun 2013 12:13:43 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	<gregkh@...uxfoundation.org>
CC:	<linux-tegra@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Subject: [PATCH 1/2] memory: tegra20-mc: Fix hang in IRQ handler.

In Tegra20 memory controller any MC interrupt would cause an
infinite loop in the IRQ handler.

Signed-off-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>
---
 drivers/memory/tegra20-mc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/tegra20-mc.c b/drivers/memory/tegra20-mc.c
index 2ca5f28..bd5a553 100644
--- a/drivers/memory/tegra20-mc.c
+++ b/drivers/memory/tegra20-mc.c
@@ -193,8 +193,11 @@ static irqreturn_t tegra20_mc_isr(int irq, void *data)
 	mask &= stat;
 	if (!mask)
 		return IRQ_NONE;
-	while ((bit = ffs(mask)) != 0)
+	while ((bit = ffs(mask)) != 0) {
 		tegra20_mc_decode(mc, bit - 1);
+		mask &= BIT(bit);
+	}
+
 	mc_writel(mc, stat, MC_INTSTATUS);
 	return IRQ_HANDLED;
 }
-- 
1.8.1.5

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