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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>