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authorBen Hutchings <ben@decadent.org.uk>2012-09-15 17:11:47 (GMT)
committerDavid S. Miller <davem@davemloft.net>2012-09-17 17:04:19 (GMT)
commit12ebc8b9af7e29ff4dc77ee0e73a6b1de513d659 (patch)
tree2ed4e36db09f02bdc7b4a4ba637543005ec0a61e /net/llc
parentda3188801898f2fb8859c232554b100f2a0250f8 (diff)
llc2: Collapse remainder of state machine into simple if-else if-statement
Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc')
-rw-r--r--net/llc/llc_station.c91
1 files changed, 4 insertions, 87 deletions
diff --git a/net/llc/llc_station.c b/net/llc/llc_station.c
index fe43158..204a835 100644
--- a/net/llc/llc_station.c
+++ b/net/llc/llc_station.c
@@ -25,16 +25,6 @@
#include <net/llc_s_st.h>
#include <net/llc_pdu.h>
-typedef int (*llc_station_ev_t)(struct sk_buff *skb);
-
-typedef int (*llc_station_action_t)(struct sk_buff *skb);
-
-/* Station component state table structure */
-struct llc_station_state_trans {
- llc_station_ev_t ev;
- llc_station_action_t *ev_actions;
-};
-
static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
{
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
@@ -109,78 +99,6 @@ free:
goto out;
}
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_XID_C event */
-static llc_station_action_t llc_stat_up_state_actions_2[] = {
- llc_station_ac_send_xid_r,
- NULL,
-};
-
-static struct llc_station_state_trans llc_stat_up_state_trans_2 = {
- .ev = llc_stat_ev_rx_null_dsap_xid_c,
- .ev_actions = llc_stat_up_state_actions_2,
-};
-
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_TEST_C event */
-static llc_station_action_t llc_stat_up_state_actions_3[] = {
- llc_station_ac_send_test_r,
- NULL,
-};
-
-static struct llc_station_state_trans llc_stat_up_state_trans_3 = {
- .ev = llc_stat_ev_rx_null_dsap_test_c,
- .ev_actions = llc_stat_up_state_actions_3,
-};
-
-/* array of pointers; one to each transition */
-static struct llc_station_state_trans *llc_stat_up_state_trans [] = {
- &llc_stat_up_state_trans_2,
- &llc_stat_up_state_trans_3,
- NULL,
-};
-
-/**
- * llc_exec_station_trans_actions - executes actions for transition
- * @trans: Address of the transition
- * @skb: Address of the event that caused the transition
- *
- * Executes actions of a transition of the station state machine. Returns
- * 0 if all actions complete successfully, nonzero otherwise.
- */
-static u16 llc_exec_station_trans_actions(struct llc_station_state_trans *trans,
- struct sk_buff *skb)
-{
- u16 rc = 0;
- llc_station_action_t *next_action = trans->ev_actions;
-
- for (; next_action && *next_action; next_action++)
- if ((*next_action)(skb))
- rc = 1;
- return rc;
-}
-
-/**
- * llc_find_station_trans - finds transition for this event
- * @skb: Address of the event
- *
- * Search thru events of the current state of the station until list
- * exhausted or it's obvious that the event is not valid for the current
- * state. Returns the address of the transition if cound, %NULL otherwise.
- */
-static struct llc_station_state_trans *
- llc_find_station_trans(struct sk_buff *skb)
-{
- int i = 0;
- struct llc_station_state_trans *rc = NULL;
- struct llc_station_state_trans **next_trans;
-
- for (next_trans = llc_stat_up_state_trans; next_trans[i]; i++)
- if (!next_trans[i]->ev(skb)) {
- rc = next_trans[i];
- break;
- }
- return rc;
-}
-
/**
* llc_station_rcv - send received pdu to the station state machine
* @skb: received frame.
@@ -189,11 +107,10 @@ static struct llc_station_state_trans *
*/
static void llc_station_rcv(struct sk_buff *skb)
{
- struct llc_station_state_trans *trans;
-
- trans = llc_find_station_trans(skb);
- if (trans)
- llc_exec_station_trans_actions(trans, skb);
+ if (llc_stat_ev_rx_null_dsap_xid_c(skb))
+ llc_station_ac_send_xid_r(skb);
+ else if (llc_stat_ev_rx_null_dsap_test_c(skb))
+ llc_station_ac_send_test_r(skb);
kfree_skb(skb);
}

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