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The backlight and LCD class _store functions currently accept values like "34 some random strings" without error. This corrects them to return -EINVAL if the value is not numeric with an optional byte of trailing whitespace. Signed-off-by: Richard Purdie <[email protected]> Cc: Greg KH <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>