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net: Fix a data-race around sysctl_net_busy_poll.
[ Upstream commitc42b7cddea
] While reading sysctl_net_busy_poll, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:0602129286
("net: add low latency socket poll") 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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@ -43,7 +43,7 @@ extern unsigned int sysctl_net_busy_poll __read_mostly;
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static inline bool net_busy_loop_on(void)
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{
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return sysctl_net_busy_poll;
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return READ_ONCE(sysctl_net_busy_poll);
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}
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static inline bool sk_can_busy_loop(const struct sock *sk)
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