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linux/drivers/isdn/hisax/hscx.c
Jesper Juhl 3c7208f253 [PATCH] kfree cleanup: drivers/isdn 
This is the drivers/isdn/ part of the big kfree cleanup patch.

Remove pointless checks for NULL prior to calling kfree() in drivers/isdn/.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:54:02 -08:00

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/* $Id: hscx.c,v 1.24.2.4 2004/01/24 20:47:23 keil Exp $
*
* HSCX specific routines
*
* Author Karsten Keil
* Copyright by Karsten Keil <keil@isdn4linux.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/init.h>
#include "hisax.h"
#include "hscx.h"
#include "isac.h"
#include "isdnl1.h"
#include <linux/interrupt.h>
static char *HSCXVer[] =
{"A1", "?1", "A2", "?3", "A3", "V2.1", "?6", "?7",
"?8", "?9", "?10", "?11", "?12", "?13", "?14", "???"};
int
HscxVersion(struct IsdnCardState *cs, char *s)
{
int verA, verB;
verA = cs->BC_Read_Reg(cs, 0, HSCX_VSTR) & 0xf;
verB = cs->BC_Read_Reg(cs, 1, HSCX_VSTR) & 0xf;
printk(KERN_INFO "%s HSCX version A: %s B: %s\n", s,
HSCXVer[verA], HSCXVer[verB]);
if ((verA == 0) | (verA == 0xf) | (verB == 0) | (verB == 0xf))
return (1);
else
return (0);
}
void
modehscx(struct BCState *bcs, int mode, int bc)
{
struct IsdnCardState *cs = bcs->cs;
int hscx = bcs->hw.hscx.hscx;
if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "hscx %c mode %d ichan %d",
'A' + hscx, mode, bc);
bcs->mode = mode;
bcs->channel = bc;
cs->BC_Write_Reg(cs, hscx, HSCX_XAD1, 0xFF);
cs->BC_Write_Reg(cs, hscx, HSCX_XAD2, 0xFF);
cs->BC_Write_Reg(cs, hscx, HSCX_RAH2, 0xFF);
cs->BC_Write_Reg(cs, hscx, HSCX_XBCH, 0x0);
cs->BC_Write_Reg(cs, hscx, HSCX_RLCR, 0x0);
cs->BC_Write_Reg(cs, hscx, HSCX_CCR1,
test_bit(HW_IPAC, &cs->HW_Flags) ? 0x82 : 0x85);
cs->BC_Write_Reg(cs, hscx, HSCX_CCR2, 0x30);
cs->BC_Write_Reg(cs, hscx, HSCX_XCCR, 7);
cs->BC_Write_Reg(cs, hscx, HSCX_RCCR, 7);
/* Switch IOM 1 SSI */
if (test_bit(HW_IOM1, &cs->HW_Flags) && (hscx == 0))
bc = 1 - bc;
if (bc == 0) {
cs->BC_Write_Reg(cs, hscx, HSCX_TSAX,
test_bit(HW_IOM1, &cs->HW_Flags) ? 0x7 : bcs->hw.hscx.tsaxr0);
cs->BC_Write_Reg(cs, hscx, HSCX_TSAR,
test_bit(HW_IOM1, &cs->HW_Flags) ? 0x7 : bcs->hw.hscx.tsaxr0);
} else {
cs->BC_Write_Reg(cs, hscx, HSCX_TSAX, bcs->hw.hscx.tsaxr1);
cs->BC_Write_Reg(cs, hscx, HSCX_TSAR, bcs->hw.hscx.tsaxr1);
}
switch (mode) {
case (L1_MODE_NULL):
cs->BC_Write_Reg(cs, hscx, HSCX_TSAX, 0x1f);
cs->BC_Write_Reg(cs, hscx, HSCX_TSAR, 0x1f);
cs->BC_Write_Reg(cs, hscx, HSCX_MODE, 0x84);
break;
case (L1_MODE_TRANS):
cs->BC_Write_Reg(cs, hscx, HSCX_MODE, 0xe4);
break;
case (L1_MODE_HDLC):
cs->BC_Write_Reg(cs, hscx, HSCX_CCR1,
test_bit(HW_IPAC, &cs->HW_Flags) ? 0x8a : 0x8d);
cs->BC_Write_Reg(cs, hscx, HSCX_MODE, 0x8c);
break;
}
if (mode)
cs->BC_Write_Reg(cs, hscx, HSCX_CMDR, 0x41);
cs->BC_Write_Reg(cs, hscx, HSCX_ISTA, 0x00);
}
void
hscx_l2l1(struct PStack *st, int pr, void *arg)
{
struct BCState *bcs = st->l1.bcs;
u_long flags;
struct sk_buff *skb = arg;
switch (pr) {
case (PH_DATA | REQUEST):
spin_lock_irqsave(&bcs->cs->lock, flags);
if (bcs->tx_skb) {
skb_queue_tail(&bcs->squeue, skb);
} else {
bcs->tx_skb = skb;
test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
bcs->hw.hscx.count = 0;
bcs->cs->BC_Send_Data(bcs);
}
spin_unlock_irqrestore(&bcs->cs->lock, flags);
break;
case (PH_PULL | INDICATION):
spin_lock_irqsave(&bcs->cs->lock, flags);
if (bcs->tx_skb) {
printk(KERN_WARNING "hscx_l2l1: this shouldn't happen\n");
} else {
test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
bcs->tx_skb = skb;
bcs->hw.hscx.count = 0;
bcs->cs->BC_Send_Data(bcs);
}
spin_unlock_irqrestore(&bcs->cs->lock, flags);
break;
case (PH_PULL | REQUEST):
if (!bcs->tx_skb) {
test_and_clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
} else
test_and_set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
break;
case (PH_ACTIVATE | REQUEST):
spin_lock_irqsave(&bcs->cs->lock, flags);
test_and_set_bit(BC_FLG_ACTIV, &bcs->Flag);
modehscx(bcs, st->l1.mode, st->l1.bc);
spin_unlock_irqrestore(&bcs->cs->lock, flags);
l1_msg_b(st, pr, arg);
break;
case (PH_DEACTIVATE | REQUEST):
l1_msg_b(st, pr, arg);
break;
case (PH_DEACTIVATE | CONFIRM):
spin_lock_irqsave(&bcs->cs->lock, flags);
test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
modehscx(bcs, 0, st->l1.bc);
spin_unlock_irqrestore(&bcs->cs->lock, flags);
st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
break;
}
}
static void
close_hscxstate(struct BCState *bcs)
{
modehscx(bcs, 0, bcs->channel);
if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
kfree(bcs->hw.hscx.rcvbuf);
bcs->hw.hscx.rcvbuf = NULL;
kfree(bcs->blog);
bcs->blog = NULL;
skb_queue_purge(&bcs->rqueue);
skb_queue_purge(&bcs->squeue);
if (bcs->tx_skb) {
dev_kfree_skb_any(bcs->tx_skb);
bcs->tx_skb = NULL;
test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
}
}
}
int
open_hscxstate(struct IsdnCardState *cs, struct BCState *bcs)
{
if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
if (!(bcs->hw.hscx.rcvbuf = kmalloc(HSCX_BUFMAX, GFP_ATOMIC))) {
printk(KERN_WARNING
"HiSax: No memory for hscx.rcvbuf\n");
test_and_clear_bit(BC_FLG_INIT, &bcs->Flag);
return (1);
}
if (!(bcs->blog = kmalloc(MAX_BLOG_SPACE, GFP_ATOMIC))) {
printk(KERN_WARNING
"HiSax: No memory for bcs->blog\n");
test_and_clear_bit(BC_FLG_INIT, &bcs->Flag);
kfree(bcs->hw.hscx.rcvbuf);
bcs->hw.hscx.rcvbuf = NULL;
return (2);
}
skb_queue_head_init(&bcs->rqueue);
skb_queue_head_init(&bcs->squeue);
}
bcs->tx_skb = NULL;
test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
bcs->event = 0;
bcs->hw.hscx.rcvidx = 0;
bcs->tx_cnt = 0;
return (0);
}
static int
setstack_hscx(struct PStack *st, struct BCState *bcs)
{
bcs->channel = st->l1.bc;
if (open_hscxstate(st->l1.hardware, bcs))
return (-1);
st->l1.bcs = bcs;
st->l2.l2l1 = hscx_l2l1;
setstack_manager(st);
bcs->st = st;
setstack_l1_B(st);
return (0);
}
void
clear_pending_hscx_ints(struct IsdnCardState *cs)
{
int val, eval;
val = cs->BC_Read_Reg(cs, 1, HSCX_ISTA);
debugl1(cs, "HSCX B ISTA %x", val);
if (val & 0x01) {
eval = cs->BC_Read_Reg(cs, 1, HSCX_EXIR);
debugl1(cs, "HSCX B EXIR %x", eval);
}
if (val & 0x02) {
eval = cs->BC_Read_Reg(cs, 0, HSCX_EXIR);
debugl1(cs, "HSCX A EXIR %x", eval);
}
val = cs->BC_Read_Reg(cs, 0, HSCX_ISTA);
debugl1(cs, "HSCX A ISTA %x", val);
val = cs->BC_Read_Reg(cs, 1, HSCX_STAR);
debugl1(cs, "HSCX B STAR %x", val);
val = cs->BC_Read_Reg(cs, 0, HSCX_STAR);
debugl1(cs, "HSCX A STAR %x", val);
/* disable all IRQ */
cs->BC_Write_Reg(cs, 0, HSCX_MASK, 0xFF);
cs->BC_Write_Reg(cs, 1, HSCX_MASK, 0xFF);
}
void
inithscx(struct IsdnCardState *cs)
{
cs->bcs[0].BC_SetStack = setstack_hscx;
cs->bcs[1].BC_SetStack = setstack_hscx;
cs->bcs[0].BC_Close = close_hscxstate;
cs->bcs[1].BC_Close = close_hscxstate;
cs->bcs[0].hw.hscx.hscx = 0;
cs->bcs[1].hw.hscx.hscx = 1;
cs->bcs[0].hw.hscx.tsaxr0 = 0x2f;
cs->bcs[0].hw.hscx.tsaxr1 = 3;
cs->bcs[1].hw.hscx.tsaxr0 = 0x2f;
cs->bcs[1].hw.hscx.tsaxr1 = 3;
modehscx(cs->bcs, 0, 0);
modehscx(cs->bcs + 1, 0, 0);
}
void
inithscxisac(struct IsdnCardState *cs, int part)
{
if (part & 1) {
clear_pending_isac_ints(cs);
clear_pending_hscx_ints(cs);
initisac(cs);
inithscx(cs);
}
if (part & 2) {
/* Reenable all IRQ */
cs->writeisac(cs, ISAC_MASK, 0);
cs->BC_Write_Reg(cs, 0, HSCX_MASK, 0);
cs->BC_Write_Reg(cs, 1, HSCX_MASK, 0);
/* RESET Receiver and Transmitter */
cs->writeisac(cs, ISAC_CMDR, 0x41);
}
}
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