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net: Fix a data-race around netdev_budget_usecs.

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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>
This commit is contained in:
Kuniyuki Iwashima 2022-08-23 10:46:55 -07:00 committed by David S. Miller
parent 657b991afb
commit fa45d484c5
1 changed files with 1 additions and 1 deletions
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net/core/dev.c
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@ -6665,7 +6665,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
{ {
struct softnet_data *sd = this_cpu_ptr(&softnet_data); struct softnet_data *sd = this_cpu_ptr(&softnet_data);
unsigned long time_limit = jiffies + 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); int budget = READ_ONCE(netdev_budget);
LIST_HEAD(list); LIST_HEAD(list);
LIST_HEAD(repoll); LIST_HEAD(repoll);