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copy_to_user() returns the number of bytes remaining but we want to return a negative error code on errors. Signed-off-by: Dan Carpenter <error27@gmail.com> Cc: "Michael H. Warfield" <mhw@wittsend.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>