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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-08-23 10:46:55 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-05 10:26:31 +0200 |
| commit | 2a341830849e1ced57e40455bcaa6fc9b79662d5 (patch) | |
| tree | acefdcb151c1c911c9cf97d00596566d2b2e5e9a /net/core | |
| parent | c3d0b6b3c808ff7d5439fbe6a41108bbb000ab26 (diff) | |
| download | linux-stable-2a341830849e1ced57e40455bcaa6fc9b79662d5.tar.gz linux-stable-2a341830849e1ced57e40455bcaa6fc9b79662d5.tar.bz2 linux-stable-2a341830849e1ced57e40455bcaa6fc9b79662d5.zip | |
net: Fix a data-race around netdev_budget_usecs.
[ Upstream commit fa45d484c52c73f79db2c23b0cdfc6c6455093ad ]
While reading netdev_budget_usecs, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 7acf8a1e8a28 ("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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index c93068ea2e4f..880b096eef8a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6335,7 +6335,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h) { struct softnet_data *sd = this_cpu_ptr(&softnet_data); unsigned long time_limit = jiffies + - usecs_to_jiffies(netdev_budget_usecs); + usecs_to_jiffies(READ_ONCE(netdev_budget_usecs)); int budget = READ_ONCE(netdev_budget); LIST_HEAD(list); LIST_HEAD(repoll); |