diff options
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 19 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 18 | ||||
| -rw-r--r-- | drivers/pci/remove.c | 8 | ||||
| -rw-r--r-- | include/linux/pci.h | 3 |
4 files changed, 36 insertions, 12 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index c91e6c18debc..276ef9c18802 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -297,7 +297,6 @@ msi_bus_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RW(msi_bus); -static DEFINE_MUTEX(pci_remove_rescan_mutex); static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, size_t count) { @@ -308,10 +307,10 @@ static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); while ((b = pci_find_next_bus(b)) != NULL) pci_rescan_bus(b); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } @@ -342,9 +341,9 @@ dev_rescan_store(struct device *dev, struct device_attribute *attr, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); pci_rescan_bus(pdev->bus); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } @@ -354,11 +353,7 @@ static struct device_attribute dev_rescan_attr = __ATTR(rescan, static void remove_callback(struct device *dev) { - struct pci_dev *pdev = to_pci_dev(dev); - - mutex_lock(&pci_remove_rescan_mutex); - pci_stop_and_remove_bus_device(pdev); - mutex_unlock(&pci_remove_rescan_mutex); + pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); } static ssize_t @@ -395,12 +390,12 @@ dev_bus_rescan_store(struct device *dev, struct device_attribute *attr, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) pci_rescan_bus_bridge_resize(bus->self); else pci_rescan_bus(bus); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index c86c8638d3c4..04796c056d12 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2024,6 +2024,24 @@ EXPORT_SYMBOL(pci_scan_slot); EXPORT_SYMBOL(pci_scan_bridge); EXPORT_SYMBOL_GPL(pci_scan_child_bus); +/* + * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal + * routines should always be executed under this mutex. + */ +static DEFINE_MUTEX(pci_rescan_remove_lock); + +void pci_lock_rescan_remove(void) +{ + mutex_lock(&pci_rescan_remove_lock); +} +EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); + +void pci_unlock_rescan_remove(void) +{ + mutex_unlock(&pci_rescan_remove_lock); +} +EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); + static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) { const struct pci_dev *a = to_pci_dev(d_a); diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index f452148e6d55..10fa13f9e309 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -95,6 +95,14 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev) } EXPORT_SYMBOL(pci_stop_and_remove_bus_device); +void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) +{ + pci_lock_rescan_remove(); + pci_stop_and_remove_bus_device(dev); + pci_unlock_rescan_remove(); +} +EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); + void pci_stop_root_bus(struct pci_bus *bus) { struct pci_dev *child, *tmp; diff --git a/include/linux/pci.h b/include/linux/pci.h index 9e3ec8b951b7..2087e6b35545 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -775,6 +775,7 @@ struct pci_dev *pci_dev_get(struct pci_dev *dev); void pci_dev_put(struct pci_dev *dev); void pci_remove_bus(struct pci_bus *b); void pci_stop_and_remove_bus_device(struct pci_dev *dev); +void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev); void pci_stop_root_bus(struct pci_bus *bus); void pci_remove_root_bus(struct pci_bus *bus); void pci_setup_cardbus(struct pci_bus *bus); @@ -1011,6 +1012,8 @@ void set_pcie_hotplug_bridge(struct pci_dev *pdev); int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap); unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge); unsigned int pci_rescan_bus(struct pci_bus *bus); +void pci_lock_rescan_remove(void); +void pci_unlock_rescan_remove(void); /* Vital product data routines */ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf); |