tree 4929d68d6949c887fbd3fb0594b0c1ec5a7e765d
parent 67cc0161ecc9ebee6eba4af6cbfdba028090b1b9
author Alan Cox <alan@lxorguk.ukuu.org.uk> 1159520500 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1159546704 -0700

[PATCH] Fix locking for tty drivers when doing urgent characters

If you send a priority character (as is done for flow control) then the tty
driver can either have its own method for "jumping the queue" or the characrer
can be queued normally.  In the latter case we call the write method but
without the atomic_write_lock taken elsewhere.

Make this consistent.  Note that the send_xchar method if implemented remains
outside of the lock as it can jump ahead of a current write so must not be
locked out by it.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>