thunderbolt: Update tb.c function documentation

Make tb.c function documentation compliant with current kernel-doc
standards. No functional changes.

Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: aborzesz

drivers/thunderbolt/tb.c

@@ -225,14 +225,12 @@ static int tb_enable_clx(struct tb_switch *sw)
 	return ret == -EOPNOTSUPP ? 0 : ret;
 }
 
-/**
- * tb_disable_clx() - Disable CL states up to host router
- * @sw: Router to start
+/*
+ * Disables CL states from @sw up to the host router.
  *
- * Disables CL states from @sw up to the host router. Returns true if
- * any CL state were disabled. This can be used to figure out whether
- * the link was setup by us or the boot firmware so we don't
- * accidentally enable them if they were not enabled during discovery.
+ * This can be used to figure out whether the link was setup by us or the
+ * boot firmware so we don't accidentally enable them if they were not
+ * enabled during discovery.
  */
 static bool tb_disable_clx(struct tb_switch *sw)
 {
@@ -456,10 +454,8 @@ static void tb_scan_xdomain(struct tb_port *port)
 	}
 }
 
-/**
- * tb_find_unused_port() - return the first inactive port on @sw
- * @sw: Switch to find the port on
- * @type: Port type to look for
+/*
+ * Returns the first inactive port on @sw.
  */
 static struct tb_port *tb_find_unused_port(struct tb_switch *sw,
 					   enum tb_port_type type)
@@ -549,6 +545,8 @@ static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb,
  * from @src_port to @dst_port. Does not take USB3 tunnel starting from
  * @src_port and ending on @src_port into account because that bandwidth is
  * already included in as part of the "first hop" USB3 tunnel.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb,
 					   struct tb_port *src_port,
@@ -601,6 +599,8 @@ static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb,
  * If there is bandwidth reserved for any of the groups between
  * @src_port and @dst_port (but not yet used) that is also taken into
  * account in the returned consumed bandwidth.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_consumed_dp_bandwidth(struct tb *tb,
 				    struct tb_port *src_port,
@@ -701,6 +701,8 @@ static bool tb_asym_supported(struct tb_port *src_port, struct tb_port *dst_port
  * single link at @port. If @include_asym is set then includes the
  * additional banwdith if the links are transitioned into asymmetric to
  * direction from @src_port to @dst_port.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_maximum_bandwidth(struct tb *tb, struct tb_port *src_port,
 				struct tb_port *dst_port, struct tb_port *port,
@@ -807,6 +809,8 @@ static int tb_maximum_bandwidth(struct tb *tb, struct tb_port *src_port,
  * If @include_asym is true then includes also bandwidth that can be
  * added when the links are transitioned into asymmetric (but does not
  * transition the links).
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port,
 				 struct tb_port *dst_port, int *available_up,
@@ -1029,6 +1033,8 @@ static int tb_create_usb3_tunnels(struct tb_switch *sw)
  * (requested + currently consumed) on that link exceed @asym_threshold.
  *
  * Must be called with available >= requested over all links.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_configure_asym(struct tb *tb, struct tb_port *src_port,
 			     struct tb_port *dst_port, int requested_up,
@@ -1135,6 +1141,8 @@ static int tb_configure_asym(struct tb *tb, struct tb_port *src_port,
  * Goes over each link from @src_port to @dst_port and tries to
  * transition the link to symmetric if the currently consumed bandwidth
  * allows and link asymmetric preference is ignored (if @keep_asym is %false).
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 static int tb_configure_sym(struct tb *tb, struct tb_port *src_port,
 			    struct tb_port *dst_port, bool keep_asym)