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llc2: Collapse remainder of state machine into simple if-else if-statement

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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2012-09-15 17:11:47 +00:00 committed by David S. Miller
parent da31888018
commit 12ebc8b9af
1 changed files with 4 additions and 87 deletions
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91
net/llc/llc_station.c
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@ -25,16 +25,6 @@
#include <net/llc_s_st.h> #include <net/llc_s_st.h>
#include <net/llc_pdu.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) static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
{ {
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
@ -109,78 +99,6 @@ static int llc_station_ac_send_test_r(struct sk_buff *skb)
goto out; 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 * llc_station_rcv - send received pdu to the station state machine
* @skb: received frame. * @skb: received frame.
@ -189,11 +107,10 @@ static struct llc_station_state_trans *
*/ */
static void llc_station_rcv(struct sk_buff *skb) static void llc_station_rcv(struct sk_buff *skb)
{ {
struct llc_station_state_trans *trans; if (llc_stat_ev_rx_null_dsap_xid_c(skb))
llc_station_ac_send_xid_r(skb);
trans = llc_find_station_trans(skb); else if (llc_stat_ev_rx_null_dsap_test_c(skb))
if (trans) llc_station_ac_send_test_r(skb);
llc_exec_station_trans_actions(trans, skb);
kfree_skb(skb); kfree_skb(skb);
} }