device core: add device_is_bound()

Adds a function that tells whether a device is already bound to a
driver.

This is needed to warn when there is an attempt to change the PM domain
of a device that has finished probing already. The reason why we want to
enforce that is because in the general case that can cause problems and
also that we can simplify code quite a bit if we can always assume that.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7399be790b5dbdf8715694522ba410cdede2808f..13a0d66e57824b9fe01dc0dd5536eb77aa58148a 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -223,9 +223,23 @@ static int deferred_probe_initcall(void)
 }
 late_initcall(deferred_probe_initcall);
 
+/**
+ * device_is_bound() - Check if device is bound to a driver
+ * @dev: device to check
+ *
+ * Returns true if passed device has already finished probing successfully
+ * against a driver.
+ *
+ * This function must be called with the device lock held.
+ */
+bool device_is_bound(struct device *dev)
+{
+       return klist_node_attached(&dev->p->knode_driver);
+}
+
 static void driver_bound(struct device *dev)
 {
-       if (klist_node_attached(&dev->p->knode_driver)) {
+       if (device_is_bound(dev)) {
                printk(KERN_WARNING "%s: device %s already bound\n",
                        __func__, kobject_name(&dev->kobj));
                return;
@@ -601,7 +615,7 @@ static int __device_attach(struct device *dev, bool allow_async)
 
        device_lock(dev);
        if (dev->driver) {
-               if (klist_node_attached(&dev->p->knode_driver)) {
+               if (device_is_bound(dev)) {
                        ret = 1;
                        goto out_unlock;
                }

diff --git a/include/linux/device.h b/include/linux/device.h
index f627ba20a46cd892c8e8f993baf08137d617aba5..6d6f1fec092fe5df78671f5b352931a2edae4aca 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1044,6 +1044,8 @@ extern int __must_check driver_attach(struct device_driver *drv);
 extern void device_initial_probe(struct device *dev);
 extern int __must_check device_reprobe(struct device *dev);
 
+extern bool device_is_bound(struct device *dev);
+
 /*
  * Easy functions for dynamically creating devices on the fly
  */