diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-11-13 17:17:09 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-07-14 21:53:55 -0400 |
| commit | 127846a4f572a91747e26f769494b97bd49d5f12 (patch) | |
| tree | 5e5bb089721ce47e469d8de2ace5d28965f73a9e /net | |
| parent | fb1cc97fe252620ec79cd62a07caf3674f3a3171 (diff) | |
| download | linux-rt-127846a4f572a91747e26f769494b97bd49d5f12.tar.gz | |
softirq: Check preemption after reenabling interrupts
raise_softirq_irqoff() disables interrupts and wakes the softirq
daemon, but after reenabling interrupts there is no preemption check,
so the execution of the softirq thread might be delayed arbitrarily.
In principle we could add that check to local_irq_enable/restore, but
that's overkill as the rasie_softirq_irqoff() sections are the only
ones which show this behaviour.
Reported-by: Carsten Emde <cbe@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 82fe4c48c536..6febdc96835f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2154,6 +2154,7 @@ static inline void __netif_reschedule(struct Qdisc *q) sd->output_queue_tailp = &q->next_sched; raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_restore(flags); + preempt_check_resched_rt(); } void __netif_schedule(struct Qdisc *q) @@ -2188,6 +2189,7 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) __this_cpu_write(softnet_data.completion_queue, skb); raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_restore(flags); + preempt_check_resched_rt(); } EXPORT_SYMBOL(__dev_kfree_skb_irq); @@ -3248,6 +3250,7 @@ drop: rps_unlock(sd); local_irq_restore(flags); + preempt_check_resched_rt(); atomic_long_inc(&skb->dev->rx_dropped); kfree_skb(skb); @@ -4196,6 +4199,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd) } else #endif local_irq_enable(); + preempt_check_resched_rt(); } static int process_backlog(struct napi_struct *napi, int quota) @@ -4270,6 +4274,7 @@ void __napi_schedule(struct napi_struct *n) local_irq_save(flags); ____napi_schedule(&__get_cpu_var(softnet_data), n); local_irq_restore(flags); + preempt_check_resched_rt(); } EXPORT_SYMBOL(__napi_schedule); @@ -6878,6 +6883,7 @@ static int dev_cpu_callback(struct notifier_block *nfb, raise_softirq_irqoff(NET_TX_SOFTIRQ); local_irq_enable(); + preempt_check_resched_rt(); /* Process offline CPU's input_pkt_queue */ while ((skb = __skb_dequeue(&oldsd->process_queue))) { |