Patch "io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq" has been added to the 6.1-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     io_uring-treat-eagain-for-req_f_nowait-as-final-for-io-wq.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From a9be202269580ca611c6cebac90eaf1795497800 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Thu, 20 Jul 2023 13:16:53 -0600
Subject: io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq

From: Jens Axboe <axboe@xxxxxxxxx>

commit a9be202269580ca611c6cebac90eaf1795497800 upstream.

io-wq assumes that an issue is blocking, but it may not be if the
request type has asked for a non-blocking attempt. If we get
-EAGAIN for that case, then we need to treat it as a final result
and not retry or arm poll for it.

Cc: stable@xxxxxxxxxxxxxxx # 5.10+
Link: https://github.com/axboe/liburing/issues/897
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 io_uring/io_uring.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1803,6 +1803,14 @@ fail:
 		ret = io_issue_sqe(req, issue_flags);
 		if (ret != -EAGAIN)
 			break;
+
+		/*
+		 * If REQ_F_NOWAIT is set, then don't wait or retry with
+		 * poll. -EAGAIN is final for that case.
+		 */
+		if (req->flags & REQ_F_NOWAIT)
+			break;
+
 		/*
 		 * We can get EAGAIN for iopolled IO even though we're
 		 * forcing a sync submission from here, since we can't


Patches currently in stable-queue which might be from axboe@xxxxxxxxx are

queue-6.1/io_uring-treat-eagain-for-req_f_nowait-as-final-for-io-wq.patch



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux