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[4/9] PCMCIA / cardbus: Use global PCI rescan-remove locking

Message ID 2463755.ZN6tpTxA86@vostro.rjw.lan
State Accepted
Headers show

Commit Message

Rafael J. Wysocki Jan. 10, 2014, 2:25 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Multiple race conditions are possible between the cardbus PCI
device addition and removal and the generic PCI bus rescan and device
removal that can be triggered via sysfs.

To avoid those race conditions make the cardbus code use global
PCI rescan-remove locking.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/pcmcia/cardbus.c |    7 +++++++
 1 file changed, 7 insertions(+)


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diff mbox

Patch

Index: linux-pm/drivers/pcmcia/cardbus.c
===================================================================
--- linux-pm.orig/drivers/pcmcia/cardbus.c
+++ linux-pm/drivers/pcmcia/cardbus.c
@@ -70,6 +70,8 @@  int __ref cb_alloc(struct pcmcia_socket
 	struct pci_dev *dev;
 	unsigned int max, pass;
 
+	pci_lock_rescan_remove();
+
 	s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
 	pci_fixup_cardbus(bus);
 
@@ -93,6 +95,7 @@  int __ref cb_alloc(struct pcmcia_socket
 
 	pci_bus_add_devices(bus);
 
+	pci_unlock_rescan_remove();
 	return 0;
 }
 
@@ -115,6 +118,10 @@  void cb_free(struct pcmcia_socket *s)
 	if (!bus)
 		return;
 
+	pci_lock_rescan_remove();
+
 	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
 		pci_stop_and_remove_bus_device(dev);
+
+	pci_unlock_rescan_remove();
 }