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io_uring/napi: fix io_napi_entry RCU accesses

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correct 3 RCU structures modifications that were not using the RCU
functions to make their update.

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/9f53b5169afa8c7bf3665a0b19dc2f7061173530.1728828877.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Olivier Langlois 2024-10-13 14:28:38 -04:00 committed by Jens Axboe
parent 2f3cc8e441
commit 45b3941d09
1 changed files with 11 additions and 6 deletions
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17
io_uring/napi.c
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@ -81,19 +81,24 @@ void __io_napi_add(struct io_ring_ctx *ctx, struct socket *sock)
}
hlist_add_tail_rcu(&e->node, hash_list);
list_add_tail(&e->list, &ctx->napi_list);
list_add_tail_rcu(&e->list, &ctx->napi_list);
spin_unlock(&ctx->napi_lock);
}
static void __io_napi_remove_stale(struct io_ring_ctx *ctx)
{
struct io_napi_entry *e;
unsigned int i;
spin_lock(&ctx->napi_lock);
hash_for_each(ctx->napi_ht, i, e, node) {
/*
* list_for_each_entry_safe() is not required as long as:
* 1. list_del_rcu() does not reset the deleted node next pointer
* 2. kfree_rcu() delays the memory freeing until the next quiescent
* state
*/
list_for_each_entry(e, &ctx->napi_list, list) {
if (time_after(jiffies, READ_ONCE(e->timeout))) {
list_del(&e->list);
list_del_rcu(&e->list);
hash_del_rcu(&e->node);
kfree_rcu(e, rcu);
}
@ -204,13 +209,13 @@ void io_napi_init(struct io_ring_ctx *ctx)
void io_napi_free(struct io_ring_ctx *ctx)
{
struct io_napi_entry *e;
unsigned int i;
spin_lock(&ctx->napi_lock);
hash_for_each(ctx->napi_ht, i, e, node) {
list_for_each_entry(e, &ctx->napi_list, list) {
hash_del_rcu(&e->node);
kfree_rcu(e, rcu);
}
INIT_LIST_HEAD_RCU(&ctx->napi_list);
spin_unlock(&ctx->napi_lock);
}