linux-kernel - [git pull] FireWire fix

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Date:	Sat, 27 Aug 2011 12:42:56 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux1394-devel@...ts.sourceforge.net
Subject: [git pull] FireWire fix

Linus, please pull from the fixes branch at

    git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6.git fixes

for a fix to a regression since v3.0-rc1.  Thanks.

Chris Boot (1):
      firewire: sbp2: fix panic after rmmod with slow targets

 drivers/firewire/sbp2.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


commit 0278ccd9d53e07c4e699432b2fed9de6c56f506c
Author: Chris Boot <bootc@...tc.net>
Date:   Mon Aug 22 21:38:38 2011 +0100

    firewire: sbp2: fix panic after rmmod with slow targets
    
    If firewire-sbp2 starts a login to a target that doesn't complete ORBs
    in a timely manner (and has to retry the login), and the module is
    removed before the operation times out, you end up with a null-pointer
    dereference and a kernel panic.
    
    [SR:  This happens because sbp2_target_get/put() do not maintain
    module references.  scsi_device_get/put() do, but at occasions like
    Chris describes one, nobody holds a reference to an SBP-2 sdev.]
    
    This patch cancels pending work for each unit in sbp2_remove(), which
    hopefully means there are no extra references around that prevent us
    from unloading. This fixes my crash.
    
    Signed-off-by: Chris Boot <bootc@...tc.net>
    Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 41841a3..17cef86 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1198,6 +1198,10 @@ static int sbp2_remove(struct device *dev)
 {
 	struct fw_unit *unit = fw_unit(dev);
 	struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
+	struct sbp2_logical_unit *lu;
+
+	list_for_each_entry(lu, &tgt->lu_list, link)
+		cancel_delayed_work_sync(&lu->work);
 
 	sbp2_target_put(tgt);
 	return 0;

-- 
Stefan Richter
-=====-==-== =--- ==-==
http://arcgraph.de/sr/
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