scheduling while atomic

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Hello NG,

I receive the warning "scheduling while atomic" in /var/log/messages executing 
this peace of code:

read_lock(&dev_base_lock);
save_flags(flags); cli();
spin_lock_irqsave(out_if->qdisc->stats_lock,flags);
ql = out_if->qdisc->qstats.backlog;
rate = out_if->qdisc->rate_est.bps;
spin_unlock_irqrestore(out_if->qdisc->stats_lock,flags);
read_unlock(&dev_base_lock);

I am trying to retrieve the qlength and the rate of an interface (struct 
netdevice *out_if).

Which situations does linux concider to be "atomic"? The spinlock? And why 
does spin_lock_irqsave not help? I am working on a 1 CPU machine. 

With kind regards, Alex

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