From: Alan Cox <alan@redhat.com>
Date: Fri, 2 Jan 2009 13:44:04 +0000 (+0000)
Subject: tty: Fix close races in USB serial
X-Git-Tag: v2.6.29-rc1~545^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4bd43f2c31848d751f63e8753cd2788d48fb5f30;p=pandora-kernel.git

tty: Fix close races in USB serial

USB serial has always had races where the tty port usage count can hit zero
during a receive event. The internal locking is a mutex so we can't use
that in the IRQ handlers.

With krefs we can tackle this differently but we still need to be careful.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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