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[NET]: Undo code bloat in hot paths due to print_mac().

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If print_mac() is used inside of a pr_debug() the compiler
can't see that the call is redundant so still performs it
even of pr_debug() ends up being a nop.

So don't use print_mac() in such cases in hot code paths,
use MAC_FMT et al. instead.

As noted by Joe Perches, pr_debug() could be modified to
handle this better, but that is a change to an interface
used by the entire kernel and thus needs to be validated
carefully.  This here is thus the less risky fix for
2.6.25

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2008-04-08 16:50:44 -07:00
parent 6adb4f733e
commit 21f644f3ea
9 changed files with 225 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/net/wireless/hostap/hostap_80211_rx.c
View File

@@ -635,7 +635,6 @@ hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
{
struct ieee80211_hdr_4addr *hdr;
int res, hdrlen;
DECLARE_MAC_BUF(mac);
if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
return 0;
@@ -647,8 +646,10 @@ hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
strcmp(crypt->ops->name, "TKIP") == 0) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
"received packet from %s\n",
local->dev->name, print_mac(mac, hdr->addr2));
"received packet from " MAC_FMT "\n",
local->dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
}
return -1;
}
@@ -657,9 +658,12 @@ hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb,
res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
printk(KERN_DEBUG "%s: decryption failed (SA=%s"
printk(KERN_DEBUG "%s: decryption failed (SA=" MAC_FMT
") res=%d\n",
local->dev->name, print_mac(mac, hdr->addr2), res);
local->dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5],
res);
local->comm_tallies.rx_discards_wep_undecryptable++;
return -1;
}
@@ -721,7 +725,6 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
struct ieee80211_crypt_data *crypt = NULL;
void *sta = NULL;
int keyidx = 0;
DECLARE_MAC_BUF(mac);
iface = netdev_priv(dev);
local = iface->local;
@@ -798,8 +801,10 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
* frames silently instead of filling system log with
* these reports. */
printk(KERN_DEBUG "%s: WEP decryption failed (not set)"
" (SA=%s)\n",
local->dev->name, print_mac(mac, hdr->addr2));
" (SA=" MAC_FMT ")\n",
local->dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
#endif
local->comm_tallies.rx_discards_wep_undecryptable++;
goto rx_dropped;
@@ -813,8 +818,9 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
(keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0)
{
printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
"from %s\n", dev->name,
print_mac(mac, hdr->addr2));
"from " MAC_FMT "\n", dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
/* TODO: could inform hostapd about this so that it
* could send auth failure report */
goto rx_dropped;
@@ -982,8 +988,10 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
"unencrypted EAPOL frame\n", local->dev->name);
} else {
printk(KERN_DEBUG "%s: encryption configured, but RX "
"frame not encrypted (SA=%s)\n",
local->dev->name, print_mac(mac, hdr->addr2));
"frame not encrypted (SA=" MAC_FMT ")\n",
local->dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
goto rx_dropped;
}
}
@@ -992,9 +1000,10 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb,
!hostap_is_eapol_frame(local, skb)) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: dropped unencrypted RX data "
"frame from %s"
" (drop_unencrypted=1)\n",
dev->name, print_mac(mac, hdr->addr2));
"frame from " MAC_FMT " (drop_unencrypted=1)\n",
dev->name,
hdr->addr2[0], hdr->addr2[1], hdr->addr2[2],
hdr->addr2[3], hdr->addr2[4], hdr->addr2[5]);
}
goto rx_dropped;
}