From c8d8fc3b2d9d4c81e3d3b23eca504ad713a91219 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 14 Feb 2024 13:57:20 -0700 Subject: [PATCH] io_uring/sqpoll: use the correct check for pending task_work A previous commit moved to using just the private task_work list for SQPOLL, but it neglected to update the check for whether we have pending task_work. Normally this is fine as we'll attempt to run it unconditionally, but if we race with going to sleep AND task_work being added, then we certainly need the right check here. Fixes: af5d68f8892f ("io_uring/sqpoll: manage task_work privately") Signed-off-by: Jens Axboe --- io_uring/sqpoll.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index f3979cacda13..82672eaaee81 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -246,6 +246,13 @@ static unsigned int io_sq_tw(struct llist_node **retry_list, int max_entries) return count; } +static bool io_sq_tw_pending(struct llist_node *retry_list) +{ + struct io_uring_task *tctx = current->io_uring; + + return retry_list || !llist_empty(&tctx->task_list); +} + static int io_sq_thread(void *data) { struct llist_node *retry_list = NULL; @@ -301,7 +308,7 @@ static int io_sq_thread(void *data) } prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); - if (!io_sqd_events_pending(sqd) && !task_work_pending(current)) { + if (!io_sqd_events_pending(sqd) && !io_sq_tw_pending(retry_list)) { bool needs_sched = true; list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {