From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 2/8] io_uring: fix commit_cqring() locking in iopoll
Date: Tue, 30 Jun 2020 15:20:37 +0300 [thread overview]
Message-ID: <75e5bc4f60d751239afa5d7bf2ec9b49308651ac.1593519186.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Don't call io_commit_cqring() without holding the completion spinlock
in io_iopoll_complete(), it can race, e.g. with async request failing.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index a1ea41b7b811..96fcdd189ac0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1923,7 +1923,10 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
io_req_free_batch(&rb, req);
}
+ spin_lock_irq(&ctx->completion_lock);
io_commit_cqring(ctx);
+ spin_unlock_irq(&ctx->completion_lock);
+
if (ctx->flags & IORING_SETUP_SQPOLL)
io_cqring_ev_posted(ctx);
io_req_free_batch_finish(ctx, &rb);
--
2.24.0
next prev parent reply other threads:[~2020-06-30 12:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 12:20 [PATCH 0/8] iopoll and task_work fixes Pavel Begunkov
2020-06-30 12:20 ` [PATCH 1/8] io_uring: fix io_fail_links() locking Pavel Begunkov
2020-06-30 14:38 ` Jens Axboe
2020-06-30 14:45 ` Pavel Begunkov
2020-06-30 12:20 ` Pavel Begunkov [this message]
2020-06-30 14:04 ` [PATCH 2/8] io_uring: fix commit_cqring() locking in iopoll Jens Axboe
2020-06-30 14:36 ` Pavel Begunkov
2020-06-30 14:46 ` Jens Axboe
2020-06-30 15:00 ` Pavel Begunkov
2020-06-30 15:33 ` Jens Axboe
2020-06-30 12:20 ` [PATCH 3/8] io_uring: fix ignoring eventfd " Pavel Begunkov
2020-06-30 12:20 ` [PATCH 4/8] io_uring: fix missing ->mm on exit Pavel Begunkov
2020-06-30 12:20 ` [PATCH 5/8] io_uring: don't fail iopoll requeue without ->mm Pavel Begunkov
2020-06-30 12:20 ` [PATCH 6/8] io_uring: fix NULL mm in io_poll_task_func() Pavel Begunkov
2020-06-30 12:20 ` [PATCH 7/8] io_uring: simplify io_async_task_func() Pavel Begunkov
2020-06-30 12:20 ` [PATCH 8/8] io_uring: optimise io_req_find_next() fast check Pavel Begunkov
2020-06-30 12:39 ` [PATCH 0/8] iopoll and task_work fixes Pavel Begunkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=75e5bc4f60d751239afa5d7bf2ec9b49308651ac.1593519186.git.asml.silence@gmail.com \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox