[PATCH] HID read busywait fix

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>
Acked-by: Vojtech Pavlik <vojtech@suse.cz>
Cc: Dmitry Torokhov <dtor_core@ameritech.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/input/hiddev.c b/drivers/usb/input/hiddev.c
index 6dd666696178..c4670e1d4654 100644
--- a/drivers/usb/input/hiddev.c
+++ b/drivers/usb/input/hiddev.c
@@ -317,6 +317,7 @@ static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t coun
                                 }
 
                                 schedule();
+                                set_current_state(TASK_INTERRUPTIBLE);
                         }
 
                         set_current_state(TASK_RUNNING);