From: Jarek Poplawski Date: Fri, 6 Jul 2007 00:42:44 +0000 (-0700) Subject: [NETPOLL]: Fixups for 'fix soft lockup when removing module' X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=25442cafb8cc3d979418caccabc91260707a0947;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [NETPOLL]: Fixups for 'fix soft lockup when removing module' >From my recent patch: > > #1 > > Until kernel ver. 2.6.21 (including) cancel_rearming_delayed_work() > > required a work function should always (unconditionally) rearm with > > delay > 0 - otherwise it would endlessly loop. This patch replaces > > this function with cancel_delayed_work(). Later kernel versions don't > > require this, so here it's only for uniformity. But Oleg Nesterov found: > But 2.6.22 doesn't need this change, why it was merged? > > In fact, I suspect this change adds a race, ... His description was right (thanks), so this patch reverts #1. Signed-off-by: Jarek Poplawski Signed-off-by: David S. Miller --- diff --git a/net/core/netpoll.c b/net/core/netpoll.c index cf40ff91ac01..a0efdd7a6b37 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -72,8 +72,7 @@ static void queue_process(struct work_struct *work) netif_tx_unlock(dev); local_irq_restore(flags); - if (atomic_read(&npinfo->refcnt)) - schedule_delayed_work(&npinfo->tx_work, HZ/10); + schedule_delayed_work(&npinfo->tx_work, HZ/10); return; } netif_tx_unlock(dev); @@ -786,8 +785,7 @@ void netpoll_cleanup(struct netpoll *np) if (atomic_dec_and_test(&npinfo->refcnt)) { skb_queue_purge(&npinfo->arp_tx); skb_queue_purge(&npinfo->txq); - cancel_delayed_work(&npinfo->tx_work); - flush_scheduled_work(); + cancel_rearming_delayed_work(&npinfo->tx_work); /* clean after last, unfinished work */ if (!skb_queue_empty(&npinfo->txq)) {