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-rw-r--r--drivers/base/core.c16
-rw-r--r--include/linux/device.h3
2 files changed, 18 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index a979bc3f49a..d0f84ff7877 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -29,6 +29,22 @@ int (*platform_notify_remove)(struct device * dev) = NULL;
* sysfs bindings for devices.
*/
+/**
+ * dev_driver_string - Return a device's driver name, if at all possible
+ * @dev: struct device to get the name of
+ *
+ * Will return the device's driver's name if it is bound to a device. If
+ * the device is not bound to a device, it will return the name of the bus
+ * it is attached to. If it is not attached to a bus either, an empty
+ * string will be returned.
+ */
+const char *dev_driver_string(struct device *dev)
+{
+ return dev->driver ? dev->driver->name :
+ (dev->bus ? dev->bus->name : "");
+}
+EXPORT_SYMBOL_GPL(dev_driver_string);
+
#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
diff --git a/include/linux/device.h b/include/linux/device.h
index b473f427891..1e5f30da98b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -416,8 +416,9 @@ extern int firmware_register(struct subsystem *);
extern void firmware_unregister(struct subsystem *);
/* debugging and troubleshooting/diagnostic helpers. */
+extern const char *dev_driver_string(struct device *dev);
#define dev_printk(level, dev, format, arg...) \
- printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
+ printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
#ifdef DEBUG
#define dev_dbg(dev, format, arg...) \