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tty: Clarify documentation of ->write()

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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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Alan 2007-05-08 00:24:21 -07:00 committed by Linus Torvalds
parent 3972b7f67b
commit 6309ed7cb2
1 changed files with 3 additions and 1 deletions
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Documentation/tty.txt
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@ -108,7 +108,9 @@ hardware driver through the function pointers within the tty->driver
structure: structure:
write() Write a block of characters to the tty device. 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. put_char() Queues a character for writing to the tty device.
If there is no room in the queue, the character is If there is no room in the queue, the character is