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mac80211: fix PS-Poll driver release TID

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Using ffs() for the PS-Poll release TID is wrong, it will cause
frames to be released in order 0 1 2 3 4 5 6 7 instead of the
correct 7 6 5 4 3 0 2 1. Fix this by adding a new function that
implements "highest priority TID" properly.

Reported-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2014-01-09 11:05:31 +01:00
parent 852c0153df
commit 0a1cb80975
1 changed files with 13 additions and 1 deletions
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14
net/mac80211/sta_info.c
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@ -1227,6 +1227,17 @@ static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
rcu_read_unlock();
}
static int find_highest_prio_tid(unsigned long tids)
{
/* lower 3 TIDs aren't ordered perfectly */
if (tids & 0xF8)
return fls(tids) - 1;
/* TID 0 is BE just like TID 3 */
if (tids & BIT(0))
return 0;
return fls(tids) - 1;
}
static void
ieee80211_sta_ps_deliver_response(struct sta_info *sta,
int n_frames, u8 ignored_acs,
@ -1288,7 +1299,8 @@ ieee80211_sta_ps_deliver_response(struct sta_info *sta,
hweight16(driver_release_tids) > 1) {
more_data = true;
driver_release_tids =
BIT(ffs(driver_release_tids) - 1);
BIT(find_highest_prio_tid(
driver_release_tids));
break;
}
}