| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 09/31] net: Fix a data-race around sysctl_net_busy_poll. | Date | Fri, 2 Sep 2022 14:18:35 +0200 |
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From: Kuniyuki Iwashima <kuniyu@amazon.com>
[ Upstream commit c42b7cddea47503411bfb5f2f93a4154aaffa2d9 ]
While reading sysctl_net_busy_poll, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 060212928670 ("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> --- include/net/busy_poll.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h index 2fbeb1313c0f4..e522187cb6935 100644 --- a/include/net/busy_poll.h +++ b/include/net/busy_poll.h @@ -39,7 +39,7 @@ extern unsigned int sysctl_net_busy_poll __read_mostly; static inline bool net_busy_loop_on(void) { - return sysctl_net_busy_poll; + return READ_ONCE(sysctl_net_busy_poll); } static inline u64 busy_loop_us_clock(void) -- 2.35.1
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