From dd5619cb4407e830a8921a93c949be37c81105b5 Mon Sep 17 00:00:00 2001 From: Kenji Kaneshige Date: Fri, 22 Sep 2006 10:17:29 -0700 Subject: pciehp - add missing locking This patch fixes the problem that system will panic if multiple power on/off operations are issued to the same slot in parallel. This problem can be easily reproduced by commands below. # while true; do echo 1 > power; echo 0 > power; done & # while true; do echo 1 > power; echo 0 > power; done & The cause is lack of locking for enable/disable operations. This patch fixes this problem. Signed-off-by: Kenji Kaneshige Signed-off-by: Kristen Carlson Accardi Signed-off-by: Greg Kroah-Hartman --- drivers/pci/hotplug/pciehp_hpc.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/pci/hotplug/pciehp_hpc.c') diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 703a64a39fe8..1c551c697c35 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -1402,6 +1402,8 @@ int pcie_init(struct controller * ctrl, struct pcie_device *dev) pdev->subsystem_vendor, pdev->subsystem_device); mutex_init(&ctrl->crit_sect); + mutex_init(&ctrl->ctrl_lock); + /* setup wait queue */ init_waitqueue_head(&ctrl->queue); -- cgit v1.2.3