rc80211-pid: fix last_sample initialization

Fix last_sample initialization. kzalloc'ing the per-STA data wasn't enough,
as jiffies can assume negative values as well. This fixes a bug which
prevented correct PID operation for a while after booting.

Thanks to Michael Buesch for reporting this.

Reported-and-tested-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rc80211_pid_algo.c b/net/mac80211/rc80211_pid_algo.c
index 962286d..554c4ba 100644 (file)
--- a/net/mac80211/rc80211_pid_algo.c
+++ b/net/mac80211/rc80211_pid_algo.c
@@ -496,6 +496,8 @@ static void *rate_control_pid_alloc_sta(void *priv, gfp_t gfp)
        if (spinfo == NULL)
                return NULL;
 
+       spinfo->last_sample = jiffies;
+
 #ifdef CONFIG_MAC80211_DEBUGFS
        spin_lock_init(&spinfo->events.lock);
        init_waitqueue_head(&spinfo->events.waitqueue);