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io_uring/eventfd: move trigger check into a helper

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It's a bit hard to read what guards the triggering, move it into a
helper and add a comment explaining it too. This additionally moves
the ev_fd == NULL check in there as well.

Link: https://lore.kernel.org/r/20240921080307.185186-5-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-09-21 01:59:50 -06:00
parent 60c5f15800
commit 3ca5a35604
1 changed files with 12 additions and 3 deletions
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15
io_uring/eventfd.c
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@ -63,6 +63,17 @@ static bool __io_eventfd_signal(struct io_ev_fd *ev_fd)
return true;
}
/*
* Trigger if eventfd_async isn't set, or if it's set and the caller is
* an async worker. If ev_fd isn't valid, obviously return false.
*/
static bool io_eventfd_trigger(struct io_ev_fd *ev_fd)
{
if (ev_fd)
return !ev_fd->eventfd_async || io_wq_current_is_worker();
return false;
}
void io_eventfd_signal(struct io_ring_ctx *ctx)
{
struct io_ev_fd *ev_fd = NULL;
@ -83,9 +94,7 @@ void io_eventfd_signal(struct io_ring_ctx *ctx)
* completed between the NULL check of ctx->io_ev_fd at the start of
* the function and rcu_read_lock.
*/
if (unlikely(!ev_fd))
return;
if (ev_fd->eventfd_async && !io_wq_current_is_worker())
if (!io_eventfd_trigger(ev_fd))
return;
if (!refcount_inc_not_zero(&ev_fd->refs))
return;