O_NONBLOCK in read path of skeleton

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Hi,

if read is cleaned up, O_NONBLOCK is trivial to support.
Comments?

	Regards
		Oliver

--

commit 5dab1a11bc706d1bd087b63d705db98e8c1913d2
Author: Oliver Neukum <oliver@xxxxxxxxxx>
Date:   Wed Sep 9 14:23:52 2009 +0200

    usb:usb-skeleton: nonblocking IO in the read path

diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 7441df2..ef8c877 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -268,6 +268,11 @@ retry:
 	spin_unlock_irq(&dev->err_lock);
 
 	if (ongoing_io) {
+		/* nonblocking IO shall not wait */
+		if (file->f_flags & O_NONBLOCK) {
+			rv = -EAGAIN;
+			goto exit;
+		}
 		/*
 		 * IO may take forever
 		 * hence wait in an interruptible state
@@ -351,8 +356,9 @@ retry:
 		rv = skel_do_read_io(dev, count);
 		if (rv < 0)
 			goto exit;
-		else
-			goto retry;	
+		else if (!file->f_flags & O_NONBLOCK)
+			goto retry;
+		rv = -EAGAIN;
 	}
 exit:
 	mutex_unlock(&dev->io_mutex);

--
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