[PATCH] mISDN: use memchr_inv
From: Akinobu Mita <akinobu.mita@gmail.com>
Date: 2012-01-27 14:26:02
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 <redacted> Cc: netdev@vger.kernel.org --- drivers/isdn/mISDN/l1oip_core.c | 16 +++------------- 1 files changed, 3 insertions(+), 13 deletions(-)
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index 22f8ec8..04f115a 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__);
--
1.7.4.4