linux-kernel - [PATCH 5.16 073/164] block: clear iocb->private in blkdev_bio_end_io

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Date:   Mon, 28 Feb 2022 18:23:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, asml.silence@...il.com,
        Stefano Garzarella <sgarzare@...hat.com>,
        Ming Lei <ming.lei@...hat.com>, Christoph Hellwig <hch@....de>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.16 073/164] block: clear iocb->private in blkdev_bio_end_io_async()

From: Stefano Garzarella <sgarzare@...hat.com>

commit bb49c6fa8b845591b317b0d7afea4ae60ec7f3aa upstream.

iocb_bio_iopoll() expects iocb->private to be cleared before
releasing the bio.

We already do this in blkdev_bio_end_io(), but we forgot in the
recently added blkdev_bio_end_io_async().

Fixes: 54a88eb838d3 ("block: add single bio async direct IO helper")
Cc: asml.silence@...il.com
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20220211090136.44471-1-sgarzare@redhat.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/fops.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/block/fops.c
+++ b/block/fops.c
@@ -289,6 +289,8 @@ static void blkdev_bio_end_io_async(stru
 	struct kiocb *iocb = dio->iocb;
 	ssize_t ret;
 
+	WRITE_ONCE(iocb->private, NULL);
+
 	if (likely(!bio->bi_status)) {
 		ret = dio->size;
 		iocb->ki_pos += ret;