From aa5aa4c803b9b0026ccf7d496c832191e949ebe9 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@neukum.org>
Date: Wed, 9 Sep 2009 17:08:50 +0200
Subject: [PATCH] --- yaml --- r: 165056 b: refs/heads/master c:
 8cd01664344e983d73a85ce604f7c23f475cf303 h: refs/heads/master v: v3

---
 [refs]                           | 2 +-
 trunk/drivers/usb/usb-skeleton.c | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index a14d5f315ee2..2c3e6de89f4b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 798199867385417ba6494472e39c016e3340758c
+refs/heads/master: 8cd01664344e983d73a85ce604f7c23f475cf303
diff --git a/trunk/drivers/usb/usb-skeleton.c b/trunk/drivers/usb/usb-skeleton.c
index 768fda9064e9..ef8c877cdd41 100644
--- a/trunk/drivers/usb/usb-skeleton.c
+++ b/trunk/drivers/usb/usb-skeleton.c
@@ -268,6 +268,11 @@ static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *
 	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 @@ static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *
 		rv = skel_do_read_io(dev, count);
 		if (rv < 0)
 			goto exit;
-		else
+		else if (!file->f_flags & O_NONBLOCK)
 			goto retry;
+		rv = -EAGAIN;
 	}
 exit:
 	mutex_unlock(&dev->io_mutex);