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net: Fix a data-race around netdev_budget_usecs.
[ Upstream commitfa45d484c5
] While reading netdev_budget_usecs, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:7acf8a1e8a
("Replace 2 jiffies with sysctl netdev_budget_usecs to enable softirq tuning") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -6335,7 +6335,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
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{
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struct softnet_data *sd = this_cpu_ptr(&softnet_data);
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unsigned long time_limit = jiffies +
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usecs_to_jiffies(netdev_budget_usecs);
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usecs_to_jiffies(READ_ONCE(netdev_budget_usecs));
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int budget = READ_ONCE(netdev_budget);
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LIST_HEAD(list);
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LIST_HEAD(repoll);
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