[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>
diff --git a/drivers/net/wan/pc300_tty.c b/drivers/net/wan/pc300_tty.c
index 29f84ad..8454bf6 100644
--- a/drivers/net/wan/pc300_tty.c
+++ b/drivers/net/wan/pc300_tty.c
@@ -400,10 +400,8 @@
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 @@
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 @@
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 @@
}
}
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 @@
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 @@
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 @@
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 @@
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 @@
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;