linux-kernel - [PATCH 2/5] Correctly clean up pci root buses in function pci_remove

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Message-Id: <1331488109-13466-3-git-send-email-jiang.liu@huawei.com>
Date:	Mon, 12 Mar 2012 01:48:26 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>, Ashok Raj <ashok.raj@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Youquan Song <youquan.song@...el.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	chenkeping@...wei.com
Subject: [PATCH 2/5] Correctly clean up pci root buses in function pci_remove_bus()

The function pci_create_root_bus() allocates the pci bus structure,
registers the bus device and creates the legacy files for a pci root
bus, but returns without setting the is_added flag. The is_added flag
for a pci root bus will be set by function pci_scan_child_bus().
If a pci root bus is destroyed before calling pci_scan_child_bus(),
the is_added flag will not be set.  So teach function pci_remove_bus()
to detect such a case and correctly clean up pci root buses.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 drivers/pci/remove.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 9ffc071..75b0092 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -70,11 +70,10 @@ void pci_remove_bus(struct pci_bus *pci_bus)
 	list_del(&pci_bus->node);
 	pci_bus_release_busn_res(pci_bus);
 	up_write(&pci_bus_sem);
-	if (!pci_bus->is_added)
-		return;
-
-	pci_remove_legacy_files(pci_bus);
-	device_unregister(&pci_bus->dev);
+	if (pci_bus->is_added || pci_is_root_bus(pci_bus)) {
+		pci_remove_legacy_files(pci_bus);
+		device_unregister(&pci_bus->dev);
+	}
 }
 EXPORT_SYMBOL(pci_remove_bus);
 
-- 
1.7.5.4

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