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driver core: add BUS_NOTIFY_UNBOUND_DRIVER event 

This patch adds a new bus notifier event which is emitted _after_ a
device is removed from its driver. This event will be used by the
dma-api debug code to check if a driver has released all dma allocations
for that device.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Joerg Roedel 2009-04-24 14:57:00 +02:00 committed by Greg Kroah-Hartman
parent 6acf70f078
commit 309b7d60a3
2 changed files with 6 additions and 0 deletions
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4
drivers/base/dd.c
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@ -320,6 +320,10 @@ static void __device_release_driver(struct device *dev)
devres_release_all(dev);
dev->driver = NULL;
klist_remove(&dev->p->knode_driver);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
}
}

2
include/linux/device.h
View File

@ -114,6 +114,8 @@ extern int bus_unregister_notifier(struct bus_type *bus,
#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
unbound */
#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
from the device */
extern struct kset *bus_get_kset(struct bus_type *bus);
extern struct klist *bus_get_device_klist(struct bus_type *bus);