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Subject[PATCH 06/64] driver core: add BUS_NOTIFY_UNBOUND_DRIVER event
Date
From: Joerg Roedel <joerg.roedel@amd.com>

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>
---
drivers/base/dd.c | 4 ++++
include/linux/device.h | 2 ++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 742cbe6..efd00de 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -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);
}
}

diff --git a/include/linux/device.h b/include/linux/device.h
index a4a7b10..4410464 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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);
--
1.6.3.2


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