From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 28 Mar 2008 19:29:28 +0800

[NET]: Add preemption point in qdisc_run

The qdisc_run loop is currently unbounded and runs entirely
in a softirq.  This is bad as it may create an unbounded softirq
run.

This patch fixes this by calling need_resched and breaking out
if necessary.

It also adds a break out if the jiffies value changes since that
would indicate we've been transmitting for too long which starves
other softirqs.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Applied, and I'll queue this up for -stable, thanks!