[PATCH] add the driver name to the hotplug environment

Add the name of the device's driver to the hotplug environment of class
and block devices.

  ACTION=add
  DEVPATH=/block/sda
  SUBSYSTEM=block
  SEQNUM=986
  PHYSDEVPATH=/devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/host0/target0:0:0/0:0:0:0
  PHYSDEVBUS=scsi
  PHYSDEVDRIVER=sd
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/base/class.c

@@ -303,6 +303,12 @@ static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
 					    buffer, buffer_size, &length,
 					    "PHYSDEVBUS=%s", dev->bus->name);
 
+		/* add driver name of physical device */
+		if (dev->driver)
+			add_hotplug_env_var(envp, num_envp, &i,
+					    buffer, buffer_size, &length,
+					    "PHYSDEVDRIVER=%s", dev->driver->name);
+
 		/* terminate, set to next free slot, shrink available space */
 		envp[i] = NULL;
 		envp = &envp[i];

drivers/block/genhd.c

@@ -469,6 +469,12 @@ static int block_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
 					    buffer, buffer_size, &length,
 					    "PHYSDEVBUS=%s", dev->bus->name);
 
+		/* add driver name of physical device */
+		if (dev->driver)
+			add_hotplug_env_var(envp, num_envp, &i,
+					    buffer, buffer_size, &length,
+					    "PHYSDEVDRIVER=%s", dev->driver->name);
+
 		envp[i] = NULL;
 	}