[RFC 3/5] CDC-WDM: making flush() interruptible

[Oliver Neukum <oneukum@suse.com>]

There is no need for flush() to be uninterruptible. close(2)
is allowed to return -EAGAIN. Change it.

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/class/cdc-wdm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 329f8d5f7c8d..f442f34f38da 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -592,7 +592,7 @@ static int wdm_flush(struct file *file, fl_owner_t id)
 	struct wdm_device *desc = file->private_data;
 	int rv;
 
-	rv = wait_event_timeout(desc->wait,
+	rv = wait_event_interruptible_timeout(desc->wait,
 			/*
 			 * needs both flags. We cannot do with one
 			 * because resetting it would cause a race
@@ -608,6 +608,8 @@ static int wdm_flush(struct file *file, fl_owner_t id)
 		return -ENODEV;
 	if (!rv)
 		return -EIO;
+	if (rv < 0)
+		return -EINTR;
 	rv = desc->werr;
 	if (rv < 0)
 		dev_err(&desc->intf->dev, "Error in flush path: %d\n",
-- 
2.16.4