From 25c72c786cb571cfdf39a31f9f64d143d8623a7a Mon Sep 17 00:00:00 2001
From: Jun Tian <jun.j.tian@intel.com>
Date: Mon, 12 May 2014 16:54:57 +0100
Subject: [PATCH] goldfish: fix kernel panic when using multiple adb connection

When using multiple adb on 64 bit kernel to transfer data,
the goldfish pipe interrupt will crash the kernel.

Signed-off-by: Jun Tian <jun.j.tian@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/platform/goldfish/goldfish_pipe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index f33c6e0e7fb0..670b9b94f74b 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -469,6 +469,9 @@ static irqreturn_t goldfish_pipe_interrupt(int irq, void *dev_id)
 
 #ifdef CONFIG_64BIT
 		channel = (u64)readl(dev->base + PIPE_REG_CHANNEL_HIGH) << 32;
+
+		if (channel == 0)
+			break;
 #endif
 		channel |= readl(dev->base + PIPE_REG_CHANNEL);