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authorAkinobu Mita <akinobu.mita@gmail.com>2012-01-27 04:24:55 +0000
committerDavid S. Miller <davem@davemloft.net>2012-02-01 14:15:32 -0500
commitb5d5843a1dd0031d63d9d9484346d86eae9cab3b (patch)
tree9b10561d8452ab3610df5737d086193db04aa4f5 /drivers/isdn
parent658ddaaf6694adf63f67451dec9ddeb87a7cb2d7 (diff)
mISDN: use memchr_inv
Use memchr_inv to check if the data contains all same bytes. It is faster than looping for each byte. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/mISDN/l1oip_core.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index 22f8ec8b9247..04f115a9c43e 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -1112,7 +1112,7 @@ handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
struct l1oip *hc = bch->hw;
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- int l, ll, i;
+ int l, ll;
unsigned char *p;
switch (hh->prim) {
@@ -1128,13 +1128,8 @@ handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
break;
}
/* check for AIS / ulaw-silence */
- p = skb->data;
l = skb->len;
- for (i = 0; i < l; i++) {
- if (*p++ != 0xff)
- break;
- }
- if (i == l) {
+ if (!memchr_inv(skb->data, 0xff, l)) {
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: got AIS, not sending, "
"but counting\n", __func__);
@@ -1144,13 +1139,8 @@ handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
return 0;
}
/* check for silence */
- p = skb->data;
l = skb->len;
- for (i = 0; i < l; i++) {
- if (*p++ != 0x2a)
- break;
- }
- if (i == l) {
+ if (!memchr_inv(skb->data, 0x2a, l)) {
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: got silence, not sending"
", but counting\n", __func__);