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>
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@ -320,6 +320,10 @@ static void __device_release_driver(struct device *dev)
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devres_release_all(dev);
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dev->driver = NULL;
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klist_remove(&dev->p->knode_driver);
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_UNBOUND_DRIVER,
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dev);
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}
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}
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@ -114,6 +114,8 @@ extern int bus_unregister_notifier(struct bus_type *bus,
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#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
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#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
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unbound */
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#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
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from the device */
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extern struct kset *bus_get_kset(struct bus_type *bus);
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extern struct klist *bus_get_device_klist(struct bus_type *bus);
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