Driver core: implement uevent suppress in kobject
This patch implements uevent suppress in kobject and removes it
from struct device, based on the following ideas:
1,Uevent sending should be one attribute of kobject, so suppressing it
in kobject layer is more natural than in device layer. By this way,
we can do it for other objects embedded with kobject.
2,It may save several bytes for each instance of struct device.(On my
omap3(32bit ARM) based box, can save 8bytes per device object)
This patch also introduces dev_set|get_uevent_suppress() helpers to
set and query uevent_suppress attribute in case to help kobject
as private part of struct device in future.
[This version is against the latest driver-core patch set of Greg,please
ignore the last version.]
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 35094f2..7af7db1 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -977,7 +977,7 @@
sizeof(struct dock_station *));
/* we want the dock device to send uevents */
- dock_device->dev.uevent_suppress = 0;
+ dev_set_uevent_suppress(&dock_device->dev, 0);
if (is_dock(handle))
dock_station->flags |= DOCK_IS_DOCK;
diff --git a/drivers/base/core.c b/drivers/base/core.c
index a90f56f..95c67ff 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -136,8 +136,6 @@
if (ktype == &device_ktype) {
struct device *dev = to_dev(kobj);
- if (dev->uevent_suppress)
- return 0;
if (dev->bus)
return 1;
if (dev->class)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 44699d9..d3a59c68 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -319,7 +319,7 @@
f_dev->parent = device;
f_dev->class = &firmware_class;
dev_set_drvdata(f_dev, fw_priv);
- f_dev->uevent_suppress = 1;
+ dev_set_uevent_suppress(f_dev, 1);
retval = device_register(f_dev);
if (retval) {
dev_err(device, "%s: device_register failed\n", __func__);
@@ -366,7 +366,7 @@
}
if (uevent)
- f_dev->uevent_suppress = 0;
+ dev_set_uevent_suppress(f_dev, 0);
*dev_p = f_dev;
goto out;
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e7d9848..fbb9030 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -841,7 +841,7 @@
if (client->driver && !is_newstyle_driver(client->driver)) {
client->dev.release = i2c_client_release;
- client->dev.uevent_suppress = 1;
+ dev_set_uevent_suppress(&client->dev, 1);
} else
client->dev.release = i2c_client_dev_release;
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 0a2f2ed..93eca17 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -84,8 +84,8 @@
kfree(private);
} else {
sch->private = private;
- if (sch->dev.uevent_suppress) {
- sch->dev.uevent_suppress = 0;
+ if (dev_get_uevent_suppress(&sch->dev)) {
+ dev_set_uevent_suppress(&sch->dev, 0);
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
}
}
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 8019288..427d11d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -272,7 +272,7 @@
* the subchannel driver can decide itself when it wants to inform
* userspace of its existence.
*/
- sch->dev.uevent_suppress = 1;
+ dev_set_uevent_suppress(&sch->dev, 1);
css_update_ssd_info(sch);
/* make it known to the system */
ret = css_sch_device_register(sch);
@@ -287,7 +287,7 @@
* a fitting driver module may be loaded based on the
* modalias.
*/
- sch->dev.uevent_suppress = 0;
+ dev_set_uevent_suppress(&sch->dev, 0);
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
}
return ret;
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 23d5752..611d2e0 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -981,7 +981,7 @@
* Now we know this subchannel will stay, we can throw
* our delayed uevent.
*/
- sch->dev.uevent_suppress = 0;
+ dev_set_uevent_suppress(&sch->dev, 0);
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
/* make it known to the system */
ret = ccw_device_register(cdev);
@@ -1243,7 +1243,7 @@
* the ccw_device and exit. This happens for all early
* devices, e.g. the console.
*/
- sch->dev.uevent_suppress = 0;
+ dev_set_uevent_suppress(&sch->dev, 0);
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
cdev->dev.groups = ccwdev_attr_groups;
device_initialize(&cdev->dev);
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 6d72024..38e337d 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -400,7 +400,7 @@
pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
- pdev->uevent_suppress = 1;
+ dev_set_uevent_suppress(pdev, 1);
err = device_add(pdev);
if (err)
goto out_put;
@@ -410,7 +410,7 @@
if (!p->holder_dir)
goto out_del;
- pdev->uevent_suppress = 0;
+ dev_set_uevent_suppress(pdev, 0);
if (flags & ADDPART_FLAG_WHOLEDISK) {
err = device_create_file(pdev, &dev_attr_whole_disk);
if (err)
@@ -422,7 +422,7 @@
rcu_assign_pointer(ptbl->part[partno], p);
/* suppress uevent if the disk supresses it */
- if (!ddev->uevent_suppress)
+ if (!dev_get_uevent_suppress(pdev))
kobject_uevent(&pdev->kobj, KOBJ_ADD);
return p;
@@ -455,7 +455,7 @@
dev_set_name(ddev, disk->disk_name);
/* delay uevents, until we scanned partition table */
- ddev->uevent_suppress = 1;
+ dev_set_uevent_suppress(ddev, 1);
if (device_add(ddev))
return;
@@ -490,7 +490,7 @@
exit:
/* announce disk after possible partitions are created */
- ddev->uevent_suppress = 0;
+ dev_set_uevent_suppress(ddev, 0);
kobject_uevent(&ddev->kobj, KOBJ_ADD);
/* announce possible partitions */
diff --git a/include/linux/device.h b/include/linux/device.h
index 4bea53f..914c101 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -373,7 +373,6 @@
struct device_private *p;
struct kobject kobj;
- unsigned uevent_suppress:1;
const char *init_name; /* initial name of the device */
struct device_type *type;
@@ -465,6 +464,16 @@
dev->driver_data = data;
}
+static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
+{
+ return dev->kobj.uevent_suppress;
+}
+
+static inline void dev_set_uevent_suppress(struct device *dev, int val)
+{
+ dev->kobj.uevent_suppress = val;
+}
+
static inline int device_is_registered(struct device *dev)
{
return dev->kobj.state_in_sysfs;
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index c9c214d..58ae8e00 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -68,6 +68,7 @@
unsigned int state_in_sysfs:1;
unsigned int state_add_uevent_sent:1;
unsigned int state_remove_uevent_sent:1;
+ unsigned int uevent_suppress:1;
};
extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 318328dd..b2181cc 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -118,6 +118,13 @@
kset = top_kobj->kset;
uevent_ops = kset->uevent_ops;
+ /* skip the event, if uevent_suppress is set*/
+ if (kobj->uevent_suppress) {
+ pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
+ "caused the event to drop!\n",
+ kobject_name(kobj), kobj, __func__);
+ return 0;
+ }
/* skip the event, if the filter returns zero. */
if (uevent_ops && uevent_ops->filter)
if (!uevent_ops->filter(kset, kobj)) {