[PATCH] tty: Clarify documentation of ->write()

[Alan <alan@lxorguk.ukuu.org.uk>]

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>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.20-mm2/Documentation/tty.txt linux-2.6.20-mm2/Documentation/tty.txt
--- linux.vanilla-2.6.20-mm2/Documentation/tty.txt	2007-02-20 12:32:28.000000000 +0000
+++ linux-2.6.20-mm2/Documentation/tty.txt	2007-02-21 14:56:36.521024464 +0000
@@ -108,7 +108,9 @@
 structure:
 
 write()			Write a block of characters to the tty device.
-			Returns the number of characters accepted.
+			Returns the number of characters accepted. The 
+			character buffer passed to this method is already
+			in kernel space.
 
 put_char()		Queues a character for writing to the tty device.
 			If there is no room in the queue, the character is
-
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