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[WAN]: kfree of NULL pointer is valid 

kfree(0) is perfectly valid, checking pointers for NULL before calling 
kfree() on them is redundant. The patch below cleans away a few such 
redundant checks (and while I was around some of those bits I couldn't 
stop myself from making a few tiny whitespace changes as well).

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Acked-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2005-05-03 14:33:27 -07:00 committed by David S. Miller
parent db46edc6d3
commit 6a5d362120
4 changed files with 23 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wan/cycx_x25.c
View File

@ -436,9 +436,7 @@ static int cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev,
}
if (err) {
if (chan->local_addr)
kfree(chan->local_addr);
kfree(chan->local_addr);
kfree(chan);
return err;
}
@ -458,9 +456,7 @@ static int cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev)
struct cycx_x25_channel *chan = dev->priv;
if (chan->svc) {
if (chan->local_addr)
kfree(chan->local_addr);
kfree(chan->local_addr);
if (chan->state == WAN_CONNECTED)
del_timer(&chan->timer);
}

27
drivers/net/wan/pc300_tty.c
View File

@ -400,10 +400,8 @@ static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
cpc_tty->buf_rx.last = NULL;
}
if (cpc_tty->buf_tx) {
kfree(cpc_tty->buf_tx);
cpc_tty->buf_tx = NULL;
}
kfree(cpc_tty->buf_tx);
cpc_tty->buf_tx = NULL;
CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
@ -666,7 +664,7 @@ static void cpc_tty_rx_work(void * data)
unsigned long port;
int i, j;
st_cpc_tty_area *cpc_tty;
volatile st_cpc_rx_buf * buf;
volatile st_cpc_rx_buf *buf;
char flags=0,flg_rx=1;
struct tty_ldisc *ld;
@ -680,9 +678,9 @@ static void cpc_tty_rx_work(void * data)
cpc_tty = &cpc_tty_area[port];
if ((buf=cpc_tty->buf_rx.first) != 0) {
if(cpc_tty->tty) {
if (cpc_tty->tty) {
ld = tty_ldisc_ref(cpc_tty->tty);
if(ld) {
if (ld) {
if (ld->receive_buf) {
CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
ld->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
@ -691,7 +689,7 @@ static void cpc_tty_rx_work(void * data)
}
}
cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
kfree((unsigned char *)buf);
kfree(buf);
buf = cpc_tty->buf_rx.first;
flg_rx = 1;
}
@ -733,7 +731,7 @@ static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
void cpc_tty_receive(pc300dev_t *pc300dev)
{
st_cpc_tty_area *cpc_tty;
st_cpc_tty_area *cpc_tty;
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
pc300_t *card = (pc300_t *)pc300chan->card;
int ch = pc300chan->channel;
@ -742,7 +740,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
int rx_len, rx_aux;
volatile unsigned char status;
unsigned short first_bd = pc300chan->rx_first_bd;
st_cpc_rx_buf *new=NULL;
st_cpc_rx_buf *new = NULL;
unsigned char dsr_rx;
if (pc300dev->cpc_tty == NULL) {
@ -762,7 +760,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
if (status & DST_EOM) {
break;
}
ptdescr=(pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
}
if (!rx_len) {
@ -771,10 +769,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
RX_BD_ADDR(ch, pc300chan->rx_last_bd));
}
if (new) {
kfree(new);
new = NULL;
}
kfree(new);
return;
}
@ -787,7 +782,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
continue;
}
new = (st_cpc_rx_buf *) kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
new = (st_cpc_rx_buf *)kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
if (new == 0) {
cpc_tty_rx_disc_frame(pc300chan);
continue;

13
drivers/net/wan/sdla_chdlc.c
View File

@ -3664,15 +3664,10 @@ static void wanpipe_tty_close(struct tty_struct *tty, struct file * filp)
chdlc_disable_comm_shutdown(card);
unlock_adapter_irq(&card->wandev.lock,&smp_flags);
if (card->tty_buf){
kfree(card->tty_buf);
card->tty_buf=NULL;
}
if (card->tty_rx){
kfree(card->tty_rx);
card->tty_rx=NULL;
}
kfree(card->tty_buf);
card->tty_buf = NULL;
kfree(card->tty_rx);
card->tty_rx = NULL;
}
return;
}

20
drivers/net/wan/x25_asy.c
View File

@ -107,13 +107,9 @@ static struct x25_asy *x25_asy_alloc(void)
static void x25_asy_free(struct x25_asy *sl)
{
/* Free all X.25 frame buffers. */
if (sl->rbuff) {
kfree(sl->rbuff);
}
kfree(sl->rbuff);
sl->rbuff = NULL;
if (sl->xbuff) {
kfree(sl->xbuff);
}
kfree(sl->xbuff);
sl->xbuff = NULL;
if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) {
@ -134,10 +130,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
{
printk("%s: unable to grow X.25 buffers, MTU change cancelled.\n",
dev->name);
if (xbuff != NULL)
kfree(xbuff);
if (rbuff != NULL)
kfree(rbuff);
kfree(xbuff);
kfree(rbuff);
return -ENOMEM;
}
@ -169,10 +163,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
spin_unlock_bh(&sl->lock);
if (xbuff != NULL)
kfree(xbuff);
if (rbuff != NULL)
kfree(rbuff);
kfree(xbuff);
kfree(rbuff);
return 0;
}