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device core: add BUS_NOTIFY_DRIVER_NOT_BOUND notification

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The users of BUS_NOTIFY_BIND_DRIVER have no chance to do any cleanup in case of
a probe failure. In the result there might be problems, such as some resources
that had been allocated will continue to be allocated and therefore lead to a
resource leak.

Introduce a new notification to inform the subscriber that ->probe() failed. Do
the same in case of failed device_bind_driver() call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2015-12-04 23:49:17 +02:00 committed by Rafael J. Wysocki
parent 4077a387b7
commit 14b6257a5f
2 changed files with 9 additions and 2 deletions
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10
drivers/base/dd.c
View File

@ -268,6 +268,9 @@ int device_bind_driver(struct device *dev)
ret = driver_sysfs_add(dev);
if (!ret)
driver_bound(dev);
else if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
return ret;
}
EXPORT_SYMBOL_GPL(device_bind_driver);
@ -290,7 +293,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
/* If using pinctrl, bind pins now before probing */
ret = pinctrl_bind_pins(dev);
if (ret)
goto probe_failed;
goto pinctrl_bind_failed;
if (driver_sysfs_add(dev)) {
printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",
@ -334,6 +337,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
goto done;
probe_failed:
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
pinctrl_bind_failed:
devres_release_all(dev);
driver_sysfs_remove(dev);
dev->driver = NULL;
@ -701,7 +708,6 @@ static void __device_release_driver(struct device *dev)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
}
}

1
include/linux/device.h
View File

@ -191,6 +191,7 @@ extern int bus_unregister_notifier(struct bus_type *bus,
unbound */
#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
from the device */
#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
extern struct kset *bus_get_kset(struct bus_type *bus);
extern struct klist *bus_get_device_klist(struct bus_type *bus);