linux-kernel - [PATCH -v3 2/3] PCI,pciehp: avoid add a device already exist before suspend during resume

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Date:	Fri, 12 Jul 2013 17:32:22 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-kernel@...r.kernel.org>, Don Dutile <ddutile@...hat.com>,
	Paul Bolle <pebolle@...cali.nl>, <linux-pci@...r.kernel.org>,
	Rafael <rjw@...k.pl>, Hanjun Guo <guohanjun@...wei.com>,
	<jiang.liu@...wei.com>, Yijing Wang <wangyijing@...wei.com>,
	Oliver Neukum <oneukum@...e.de>,
	Gu Zheng <guz.fnst@...fujitsu.com>
Subject: [PATCH -v3 2/3] PCI,pciehp: avoid add a device already exist before suspend during resume

Currently, pciehp_resume() try to hot add device if the slot adapter
status return true. But if there are already some devices exist,
namely list_empty(bus->devices) return false. We should not add the device
again, because the device add action will fail. Also print some uncomfortable
messages like this:
	pciehp 0000:00:1c.1:pcie04: Device 0000:03:00.0 already exists at 0000:03:00, cannot hot-add
	pciehp 0000:00:1c.1:pcie04: Cannot add device at 0000:03:00

Tested-by: Paul Bolle <pebolle@...cali.nl>
Signed-off-by: Yijing Wang <wangyijing@...wei.com>
Cc: Paul Bolle <pebolle@...cali.nl>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Oliver Neukum <oneukum@...e.de>
Cc: Gu Zheng <guz.fnst@...fujitsu.com>
Cc: linux-pci@...r.kernel.org
---
 drivers/pci/hotplug/pciehp_core.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 7d72c5e..7fe9dbd 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -300,6 +300,7 @@ static int pciehp_resume (struct pcie_device *dev)
 {
 	struct controller *ctrl;
 	struct slot *slot;
+	struct pci_bus *pbus = dev->port->subordinate;
 	u8 status;
 
 	ctrl = get_service_data(dev);
@@ -311,10 +312,13 @@ static int pciehp_resume (struct pcie_device *dev)
 
 	/* Check if slot is occupied */
 	pciehp_get_adapter_status(slot, &status);
-	if (status)
-		pciehp_enable_slot(slot);
-	else
+	if (status) {
+		if (list_empty(&pbus->devices))
+			pciehp_enable_slot(slot);
+	} else if (!list_empty(&pbus->devices)) {
 		pciehp_disable_slot(slot);
+	}
+
 	return 0;
 }
 #endif /* PM */
-- 
1.7.1


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