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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

43
net/ieee80211/ieee80211_rx.c
View File

@ -271,7 +271,6 @@ ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
{
struct ieee80211_hdr_3addr *hdr;
int res, hdrlen;
DECLARE_MAC_BUF(mac);
if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
return 0;
@ -283,8 +282,12 @@ ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
IEEE80211_DEBUG_DROP("decryption failed (SA=%s"
") res=%d\n", print_mac(mac, hdr->addr2), res);
IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
") res=%d\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5],
res);
if (res == -2)
IEEE80211_DEBUG_DROP("Decryption failed ICV "
"mismatch (key %d)\n",
@ -304,7 +307,6 @@ ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
{
struct ieee80211_hdr_3addr *hdr;
int res, hdrlen;
DECLARE_MAC_BUF(mac);
if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
return 0;
@ -317,8 +319,12 @@ ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
atomic_dec(&crypt->refcnt);
if (res < 0) {
printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
" (SA=%s keyidx=%d)\n",
ieee->dev->name, print_mac(mac, hdr->addr2), keyidx);
" (SA=" MAC_FMT " keyidx=%d)\n",
ieee->dev->name,
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5],
keyidx);
return -1;
}
@ -462,8 +468,10 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
* frames silently instead of filling system log with
* these reports. */
IEEE80211_DEBUG_DROP("Decryption failed (not set)"
" (SA=%s)\n",
print_mac(mac, hdr->addr2));
" (SA=" MAC_FMT ")\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
ieee->ieee_stats.rx_discards_undecryptable++;
goto rx_dropped;
}
@ -474,8 +482,10 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
(keyidx = hostap_rx_frame_decrypt(ieee, 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;
@ -653,8 +663,11 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
* configured */
} else {
IEEE80211_DEBUG_DROP("encryption configured, but RX "
"frame not encrypted (SA=%s"
")\n", print_mac(mac, hdr->addr2));
"frame not encrypted (SA="
MAC_FMT ")\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
goto rx_dropped;
}
}
@ -662,9 +675,11 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
!ieee80211_is_eapol_frame(ieee, skb)) {
IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
"frame from %s"
"frame from " MAC_FMT
" (drop_unencrypted=1)\n",
print_mac(mac, hdr->addr2));
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
goto rx_dropped;
}