From: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Date: Tue, 11 Jun 2013 10:11:18 +0000 (+0300)
Subject: memory: tegra20-mc: Fix hang in IRQ handler.
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d777f98bfa44e5a2748603276e9e9fb6ab999079;p=openwrt%2Fstaging%2Fblogic.git

memory: tegra20-mc: Fix hang in IRQ handler.

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

Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/memory/tegra20-mc.c b/drivers/memory/tegra20-mc.c
index 2ca5f2814f4a..0548eeacd573 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 - 1);
+	}
+
 	mc_writel(mc, stat, MC_INTSTATUS);
 	return IRQ_HANDLED;
 }