linux-kernel - [PATCH] block: Set memalloc_noio to false on device_add

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Date:   Mon, 11 Dec 2023 15:53:56 +0800
From:   linan666@...weicloud.com
To:     axboe@...nel.dk, akpm@...ux-foundation.org, ming.lei@...onical.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linan666@...weicloud.com, yukuai3@...wei.com, yi.zhang@...wei.com,
        houtao1@...wei.com, yangerkun@...wei.com
Subject: [PATCH] block: Set memalloc_noio to false on device_add_disk() error path

From: Li Nan <linan122@...wei.com>

On the error path of device_add_disk(), device's memalloc_noio flag was
set but not cleared. As the comment of pm_runtime_set_memalloc_noio(),
"The function should be called between device_add() and device_del()".
Clear this flag before device_del() now.

Fixes: 25e823c8c37d ("block/genhd.c: apply pm_runtime_set_memalloc_noio on block devices")
Signed-off-by: Li Nan <linan122@...wei.com>
---
 block/genhd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/genhd.c b/block/genhd.c
index c9d06f72c587..13db3a7943d8 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -542,6 +542,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 	kobject_put(disk->part0->bd_holder_dir);
 out_del_block_link:
 	sysfs_remove_link(block_depr, dev_name(ddev));
+	pm_runtime_set_memalloc_noio(ddev, false);
 out_device_del:
 	device_del(ddev);
 out_free_ext_minor:
-- 
2.39.2