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PCI hotplug: fix lock imbalance in pciehp 

set_lock_status omits mutex_unlock in fail path. Add the omitted
unlock.

As a result a lockup caused by this can be triggered from userspace
by writing 1 to /sys/bus/pci/slots/.../lock often enough.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jiri Slaby 2009-01-17 16:23:55 +01:00 committed by Jesse Barnes
parent aa8c6c9374
commit c2fdd36b55
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/hotplug/pciehp_core.c
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@ -126,8 +126,10 @@ static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
mutex_lock(&slot->ctrl->crit_sect);
/* has it been >1 sec since our last toggle? */
if ((get_seconds() - slot->last_emi_toggle) < 1)
if ((get_seconds() - slot->last_emi_toggle) < 1) {
mutex_unlock(&slot->ctrl->crit_sect);
return -EINVAL;
}
/* see what our current state is */
retval = get_lock_status(hotplug_slot, &value);