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@xxxxxxxxxxxxxxx>
---
drivers/base/dd.c | 10 ++++++++--
include/linux/device.h | 1 +
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 8d4eb4d..7399be7 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -299,6 +299,9 @@ 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);
@@ -332,7 +335,7 @@ 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",
@@ -376,6 +379,10 @@ 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;
@@ -749,7 +756,6 @@ static void __device_release_driver(struct device *dev)
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 b8f411b..f627ba2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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);
--
2.6.2
--
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