tty: Clarify documentation of ->write()
The tty driver write method is different to the usual fops device write methods as the buffer is already in kernel space. Clarify the docs since someone writing a driver made that mistake. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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