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[DragonFlyBSD - Bug #2458] ath: ran out of descriptors

From: Johannes Hofmann via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 28 Nov 2012 14:23:41 -0800

Issue #2458 has been updated by Johannes Hofmann.

Thanks for looking into this! I tried to implement it as you suggested
and simply doing:

diff --git a/sys/netproto/802_11/wlan/ieee80211.c b/sys/netproto/802_11/wlan/ieee80211.c
index c4084d4..d6be645 100644
--- a/sys/netproto/802_11/wlan/ieee80211.c
+++ b/sys/netproto/802_11/wlan/ieee80211.c
@@ -304,7 +304,7 @@ ieee80211_ifattach(struct ieee80211com *ic,

        ifp->if_addrlen = IEEE80211_ADDR_LEN;
        ifp->if_hdrlen = 0;
-       if_attach(ifp, NULL);
+       if_attach(ifp, &wlan_global_serializer);
        ifp->if_mtu = IEEE80211_MTU_MAX;
        ifp->if_broadcastaddr = ieee80211broadcastaddr;
        ifp->if_output = null_output;
diff --git a/sys/netproto/802_11/wlan/ieee80211_ioctl.c
index a31dad7..d7f2d92 100644
--- a/sys/netproto/802_11/wlan/ieee80211_ioctl.c
+++ b/sys/netproto/802_11/wlan/ieee80211_ioctl.c
@@ -3201,7 +3201,9 @@ ieee80211_ioctl_updatemulti(struct ieee80211com *ic)
                TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                        if (ifma->ifma_addr->sa_family != AF_LINK)
+                       wlan_serialize_exit();
                        (void) if_addmulti(parent, ifma->ifma_addr, NULL);
+                       wlan_serialize_enter();
        parent->if_ioctl = ioctl;

seems to work for ath so far. Do you have a better idea how to deal
with the recursive call to if_addmulti()?
Of course the other wlan drivers would also need to be adjusted. I
can work on that if you confirm that this is the way to go.

Best Regards,

Bug #2458: ath: ran out of descriptors

Author: Johannes Hofmann
Status: New
Priority: Normal
Target version: 

After running for a while in a WPA secured WLAN with an ath(4) card, I get:
   ath: ran out of descriptors
and the network stops working.
Sometimes destroying wlan0 and kldunload if_ath; kldload if_ath
restores network, but in some cases I get 

Nov 18 12:45:06 plop kernel: Trace beginning at frame 0xd6264ca8
Nov 18 12:45:06 plop kernel: m_free(ffffffff,d47f1c00,0,d936dc00,d5a94400) at m_free+0xc6 0x
Nov 18 12:45:06 plop kernel: m_free(d47f7800,d6264cfc,c09c8846,d47f7800,c47576f0) at m_free+
0xc6 0xc01f26ed 
Nov 18 12:45:06 plop kernel: m_freem(d47f7800,c47576f0,d6264cfc,c09e8e58,d5cf9f80) at m_free
m+0x15 0xc01f29c6 
Nov 18 12:45:06 plop kernel: ieee80211_flush_ifq(d5a94400,d4c46500,ffffffff,d5e35478,c47576f
0) at ieee80211_flush_ifq+0x70 0xc09c8846 
Nov 18 12:45:06 plop kernel: ieee80211_newstate_task(d4c46500,1,c47576f4,1,c475770c) at ieee
80211_newstate_task+0x231 0xc09e74e3 
Nov 18 12:45:06 plop kernel: taskqueue_run(c47576f0,c475770c,0,c03d27b3,0) at taskqueue_run+
0x93 0xc01dd304 
Nov 18 12:45:06 plop kernel: taskqueue_thread_loop(d5e3544c,0,0,0,0) at taskqueue_thread_loo
p+0x4b 0xc01dd5ed 
Nov 18 12:45:06 plop kernel: lwkt_exit() at lwkt_exit 0xc01bbab3 

and the system freezes on kldunload if_ath

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