From 0278ccd9d53e07c4e699432b2fed9de6c56f506c Mon Sep 17 00:00:00 2001 From: Chris Boot Date: Mon, 22 Aug 2011 21:38:38 +0100 Subject: [PATCH] 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 Signed-off-by: Stefan Richter --- drivers/firewire/sbp2.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c index 41841a3e3f99..17cef864506a 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;