linux-kernel - [ 045/128] PCI: pciehp: Fix wrong workqueue cleanup

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Message-Id: <20130203144648.078523335@decadent.org.uk>
Date:	Sun, 03 Feb 2013 15:47:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [ 045/128] PCI: pciehp: Fix wrong workqueue cleanup

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>

commit 027e8d52abdd44bc00e405af83cd2fbfb96c0824 upstream.

Fix improper workqueue cleanup.

In the current pciehp, pcied_cleanup() calls destroy_workqueue()
before calling pcie_port_service_unregister(). This causes kernel oops
because flush_workqueue() is called in the pcie_port_service_unregister()
code path after the workqueue was destroyed. So pcied_cleanup() must call
pcie_port_service_unregister() first before calling destroy_workqueue().

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pci/hotplug/pciehp_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 7ac8358..a13ad13 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -366,9 +366,9 @@ static int __init pcied_init(void)
 static void __exit pcied_cleanup(void)
 {
 	dbg("unload_pciehpd()\n");
+	pcie_port_service_unregister(&hpdriver_portdrv);
 	destroy_workqueue(pciehp_ordered_wq);
 	destroy_workqueue(pciehp_wq);
-	pcie_port_service_unregister(&hpdriver_portdrv);
 	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 }
 


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