diff options
| -rw-r--r-- | drivers/base/core.c | 16 | ||||
| -rw-r--r-- | include/linux/device.h | 3 |
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...) \ |