From: Jiri Kosina <jkosina@suse.cz>
Date: Mon, 23 Apr 2007 21:41:21 +0000 (-0700)
Subject: 8250: fix possible deadlock between serial8250_handle_port() and serial8250_interrupt()
X-Git-Tag: v2.6.21~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4bf3631cdb012591667ab927fcd7719d92837833;p=pandora-kernel.git

8250: fix possible deadlock between serial8250_handle_port() and serial8250_interrupt()

Commit 40b36daa introduced possibility that serial8250_backup_timeout() ->
serial8250_handle_port() locks port.lock without disabling irqs, thus
allowing deadlock against interrupt handler (port.lock is acquired in
serial8250_interrupt()).

Spotted by lockdep.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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