diff options
| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2006-09-22 21:17:29 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-18 22:36:10 +0400 |
| commit | dd5619cb4407e830a8921a93c949be37c81105b5 (patch) | |
| tree | f726db26b6019e6f741dfb146e3d37eca9198cf4 /drivers/pci/hotplug/pciehp_hpc.c | |
| parent | 49ed2b4963cd00993eab518b820a6700f94f222d (diff) | |
| download | linux-dd5619cb4407e830a8921a93c949be37c81105b5.tar.xz | |
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 <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_hpc.c | 2 |
1 files changed, 2 insertions, 0 deletions
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); |