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>

1 files changed, 3 insertions, 0 deletions

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);