From: "Micon, David" <DMicon@pelco.com>

Make a read of a HID device block until data is available.  Without it, the
read goes into a busy-wait loop until data is available.

Cc: Greg KH <greg@kroah.com>
Cc: Vojtech Pavlik <vojtech@suse.cz>
Cc: Dmitry Torokhov <dtor_core@ameritech.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/usb/input/hiddev.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN drivers/usb/input/hiddev.c~hid-read-busywait-fix drivers/usb/input/hiddev.c
--- devel/drivers/usb/input/hiddev.c~hid-read-busywait-fix	2006-05-15 21:47:11.000000000 -0700
+++ devel-akpm/drivers/usb/input/hiddev.c	2006-05-15 21:47:11.000000000 -0700
@@ -317,6 +317,7 @@ static ssize_t hiddev_read(struct file *
 				}
 
 				schedule();
+				set_current_state(TASK_INTERRUPTIBLE);
 			}
 
 			set_current_state(TASK_RUNNING);
_