diff options
| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2006-09-22 10:17:29 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-18 11:36:10 -0700 |
| commit | dd5619cb4407e830a8921a93c949be37c81105b5 (patch) | |
| tree | f726db26b6019e6f741dfb146e3d37eca9198cf4 /drivers/pci/hotplug/pciehp_core.c | |
| parent | 49ed2b4963cd00993eab518b820a6700f94f222d (diff) | |
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_core.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index c67b7c3f1ddf..f93e81e2d2c7 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -448,7 +448,7 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_ } /* Wait for exclusive access to hardware */ - mutex_lock(&ctrl->crit_sect); + mutex_lock(&ctrl->ctrl_lock); t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */ @@ -456,7 +456,7 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_ rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/ if (rc) { /* Done with exclusive hardware access */ - mutex_unlock(&ctrl->crit_sect); + mutex_unlock(&ctrl->ctrl_lock); goto err_out_free_ctrl_slot; } else /* Wait for the command to complete */ @@ -464,7 +464,7 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_ } /* Done with exclusive hardware access */ - mutex_unlock(&ctrl->crit_sect); + mutex_unlock(&ctrl->ctrl_lock); return 0; |