ACPI / hotplug / PCI: Drop crit_sect locking
After recent PCI core changes related to the rescan/remove locking,
the code sections under crit_sect mutexes from ACPIPHP slot objects
are always executed under the general PCI rescan/remove lock.
For this reason, the crit_sect mutexes are simply redundant, so drop
them.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 27abd50..0961911 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -347,7 +347,6 @@
slot->bus = bridge->pci_bus;
slot->device = device;
INIT_LIST_HEAD(&slot->funcs);
- mutex_init(&slot->crit_sect);
list_add_tail(&slot->node, &bridge->slots);
@@ -744,7 +743,6 @@
struct pci_bus *bus = slot->bus;
struct pci_dev *dev, *tmp;
- mutex_lock(&slot->crit_sect);
if (slot_no_hotplug(slot)) {
; /* do nothing */
} else if (get_slot_status(slot) == ACPI_STA_ALL) {
@@ -759,7 +757,6 @@
} else {
disable_slot(slot);
}
- mutex_unlock(&slot->crit_sect);
}
}
@@ -846,12 +843,8 @@
} else {
struct acpiphp_slot *slot = func->slot;
- if (slot->flags & SLOT_IS_GOING_AWAY)
- break;
-
- mutex_lock(&slot->crit_sect);
- enable_slot(slot);
- mutex_unlock(&slot->crit_sect);
+ if (!(slot->flags & SLOT_IS_GOING_AWAY))
+ enable_slot(slot);
}
break;
@@ -862,7 +855,6 @@
acpiphp_check_bridge(bridge);
} else {
struct acpiphp_slot *slot = func->slot;
- int ret;
if (slot->flags & SLOT_IS_GOING_AWAY)
break;
@@ -871,10 +863,7 @@
* Check if anything has changed in the slot and rescan
* from the parent if that's the case.
*/
- mutex_lock(&slot->crit_sect);
- ret = acpiphp_rescan_slot(slot);
- mutex_unlock(&slot->crit_sect);
- if (ret)
+ if (acpiphp_rescan_slot(slot))
acpiphp_check_bridge(func->parent);
}
break;
@@ -1088,13 +1077,10 @@
if (slot->flags & SLOT_IS_GOING_AWAY)
return -ENODEV;
- mutex_lock(&slot->crit_sect);
/* configure all functions */
if (!(slot->flags & SLOT_ENABLED))
enable_slot(slot);
- mutex_unlock(&slot->crit_sect);
-
pci_unlock_rescan_remove();
return 0;
}
@@ -1110,8 +1096,6 @@
if (slot->flags & SLOT_IS_GOING_AWAY)
return -ENODEV;
- mutex_lock(&slot->crit_sect);
-
/* unconfigure all functions */
disable_slot(slot);
@@ -1125,7 +1109,6 @@
break;
}
- mutex_unlock(&slot->crit_sect);
return 0;
}