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wifi: wext: avoid extra calls to strlen() in ieee80211_bss()

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Since 'sprintf()' returns the number of characters emitted, an
extra calls to 'strlen()' in 'ieee80211_bss()' may be dropped.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://lore.kernel.org/r/20230912035522.15947-1-dmantipov@yandex.ru
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Dmitry Antipov 2023-09-12 06:55:16 +03:00 committed by Johannes Berg
parent 8c73d5248d
commit 22446b7ee2
1 changed files with 25 additions and 22 deletions
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47
net/wireless/scan.c
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@ -3422,59 +3422,63 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
cfg = (u8 *)ie + 2;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "Mesh Network Path Selection Protocol ID: "
"0x%02X", cfg[0]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Mesh Network Path Selection Protocol ID: 0x%02X",
cfg[0]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Path Selection Metric ID: 0x%02X",
cfg[1]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Path Selection Metric ID: 0x%02X",
cfg[1]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Congestion Control Mode ID: 0x%02X",
cfg[2]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Congestion Control Mode ID: 0x%02X",
cfg[2]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Synchronization ID: 0x%02X",
cfg[3]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Authentication ID: 0x%02X",
cfg[4]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Formation Info: 0x%02X",
cfg[5]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf,
"Capabilities: 0x%02X",
cfg[6]);
current_ev = iwe_stream_add_point_check(info,
current_ev,
end_buf,
@ -3530,17 +3534,16 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf, "tsf=%016llx",
(unsigned long long)(ies->tsf));
current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
&iwe, buf);
if (IS_ERR(current_ev))
goto unlock;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, " Last beacon: %ums ago",
elapsed_jiffies_msecs(bss->ts));
iwe.u.data.length = strlen(buf);
iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago",
elapsed_jiffies_msecs(bss->ts));
current_ev = iwe_stream_add_point_check(info, current_ev,
end_buf, &iwe, buf);
if (IS_ERR(current_ev))