rename: _request_firmware_load() fw_load_sysfs_fallback()

This reflects much clearer what is being done.
While at it, kdoc'ify it.

Signed-off-by: Luis R. Rodriguez <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/driver-api/firmware/fallback-mechanisms.rst

···
 fallback mechanism userspace can be informed of the addition of the device by
 relying on kobject uevents. The addition of the device into the device
 hierarchy means the fallback mechanism for firmware loading has been initiated.
-For details of implementation refer to _request_firmware_load(), in particular
+For details of implementation refer to fw_load_sysfs_fallback(), in particular
 on the use of dev_set_uevent_suppress() and kobject_uevent().
 
 The kernel's kobject uevent mechanism is implemented in lib/kobject_uevent.c,

drivers/base/firmware_loader/fallback.c

···
 	return fw_sysfs;
 }
 
-/* load a firmware via user helper */
-static int _request_firmware_load(struct fw_sysfs *fw_sysfs,
+/**
+ * fw_load_sysfs_fallback - load a firmware via the syfs fallback mechanism
+ * @fw_sysfs: firmware syfs information for the firmware to load
+ * @opt_flags: flags of options, FW_OPT_*
+ * @timeout: timeout to wait for the load
+ *
+ * In charge of constructing a sysfs fallback interface for firmware loading.
+ **/
+static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs,
 				  unsigned int opt_flags, long timeout)
 {
 	int retval = 0;
···
 	}
 
 	fw_sysfs->fw_priv = firmware->priv;
-	ret = _request_firmware_load(fw_sysfs, opt_flags, timeout);
+	ret = fw_load_sysfs_fallback(fw_sysfs, opt_flags, timeout);
 
 	if (!ret)
 		ret = assign_fw(firmware, device, opt_flags);