git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-18 03:23:53 -04:00
Code Issues Packages Projects Releases Wiki Activity

io_uring: revise completion_lock locking

Browse Source 
io_kill_timeouts() doesn't post any events but queues everything to
task_work. Locking there is needed for protecting linked requests
traversing, we should grab completion_lock directly instead of using
io_cq_[un]lock helpers. Same goes for __io_req_find_next_prep().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/88e75d481a65dc295cb59722bb1cf76402d1c06b.1670002973.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2022-12-02 17:47:23 +00:00
committed by Jens Axboe
parent ea011ee102
commit 6971253f07
3 changed files with 20 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
io_uring/timeout.c
View File

@@ -624,7 +624,11 @@ __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
struct io_timeout *timeout, *tmp;
int canceled = 0;
io_cq_lock(ctx);
/*
* completion_lock is needed for io_match_task(). Take it before
* timeout_lockfirst to keep locking ordering.
*/
spin_lock(&ctx->completion_lock);
spin_lock_irq(&ctx->timeout_lock);
list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) {
struct io_kiocb *req = cmd_to_io_kiocb(timeout);
@@ -634,6 +638,6 @@ __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
canceled++;
}
spin_unlock_irq(&ctx->timeout_lock);
io_cq_unlock_post(ctx);
spin_unlock(&ctx->completion_lock);
return canceled != 0;
}