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Subject[PATCH 31/75] Driver core: add uevent file for bus and driver
Date
From: Kay Sievers <kay.sievers@vrfy.org>

This has been in the SuSE kernels for some time now.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/base/bus.c | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 0a8d075..6768a01 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -610,6 +610,17 @@ static inline int add_probe_files(struct bus_type *bus) { return 0; }
static inline void remove_probe_files(struct bus_type *bus) {}
#endif

+static ssize_t driver_uevent_store(struct device_driver *drv,
+ const char *buf, size_t count)
+{
+ enum kobject_action action;
+
+ if (kobject_action_type(buf, count, &action) == 0)
+ kobject_uevent(&drv->kobj, action);
+ return count;
+}
+static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store);
+
/**
* bus_add_driver - Add a driver to the bus.
* @drv: driver.
@@ -640,6 +651,11 @@ int bus_add_driver(struct device_driver *drv)
klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
module_add_driver(drv->owner, drv);

+ error = driver_create_file(drv, &driver_attr_uevent);
+ if (error) {
+ printk(KERN_ERR "%s: uevent attr (%s) failed\n",
+ __FUNCTION__, drv->name);
+ }
error = driver_add_attrs(bus, drv);
if (error) {
/* How the hell do we get out of this pickle? Give up */
@@ -677,6 +693,7 @@ void bus_remove_driver(struct device_driver * drv)

remove_bind_files(drv);
driver_remove_attrs(drv->bus, drv);
+ driver_remove_file(drv, &driver_attr_uevent);
klist_remove(&drv->knode_bus);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
driver_detach(drv);
@@ -804,6 +821,17 @@ static void klist_devices_put(struct klist_node *n)
put_device(dev);
}

+static ssize_t bus_uevent_store(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ enum kobject_action action;
+
+ if (kobject_action_type(buf, count, &action) == 0)
+ kobject_uevent(&bus->subsys.kobj, action);
+ return count;
+}
+static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
+
/**
* bus_register - register a bus with the system.
* @bus: bus.
@@ -828,6 +856,10 @@ int bus_register(struct bus_type * bus)
if (retval)
goto out;

+ retval = bus_create_file(bus, &bus_attr_uevent);
+ if (retval)
+ goto bus_uevent_fail;
+
kobject_set_name(&bus->devices.kobj, "devices");
bus->devices.kobj.parent = &bus->subsys.kobj;
retval = kset_register(&bus->devices);
@@ -863,6 +895,8 @@ bus_probe_files_fail:
bus_drivers_fail:
kset_unregister(&bus->devices);
bus_devices_fail:
+ bus_remove_file(bus, &bus_attr_uevent);
+bus_uevent_fail:
subsystem_unregister(&bus->subsys);
out:
return retval;
@@ -882,6 +916,7 @@ void bus_unregister(struct bus_type * bus)
remove_probe_files(bus);
kset_unregister(&bus->drivers);
kset_unregister(&bus->devices);
+ bus_remove_file(bus, &bus_attr_uevent);
subsystem_unregister(&bus->subsys);
}

--
1.5.3.4
-
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