linux-kernel - [PATCH AUTOSEL 6.3 22/30] null_blk: Fix: memory release when memory

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Message-Id: <20230616102521.673087-22-sashal@kernel.org>
Date:   Fri, 16 Jun 2023 06:25:10 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nitesh Shetty <nj.shetty@...sung.com>,
        Anuj Gupta <anuj20.g@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>,
        bvanassche@....org, kch@...dia.com,
        damien.lemoal@...nsource.wdc.com, vincent.fu@...sung.com,
        error27@...il.com, akinobu.mita@...il.com,
        shinichiro.kawasaki@....com, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 6.3 22/30] null_blk: Fix: memory release when memory_backed=1

From: Nitesh Shetty <nj.shetty@...sung.com>

[ Upstream commit 8cfb98196cceec35416041c6b91212d2b99392e4 ]

Memory/pages are not freed, when unloading nullblk driver.

Steps to reproduce issue
  1.free -h
        total        used        free      shared  buff/cache   available
Mem:    7.8Gi       260Mi       7.1Gi       3.0Mi       395Mi       7.3Gi
Swap:      0B          0B          0B
  2.modprobe null_blk memory_backed=1
  3.dd if=/dev/urandom of=/dev/nullb0 oflag=direct bs=1M count=1000
  4.modprobe -r null_blk
  5.free -h
        total        used        free      shared  buff/cache   available
Mem:    7.8Gi       1.2Gi       6.1Gi       3.0Mi       398Mi       6.3Gi
Swap:      0B          0B          0B

Signed-off-by: Anuj Gupta <anuj20.g@...sung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
Link: https://lore.kernel.org/r/20230605062354.24785-1-nj.shetty@samsung.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/null_blk/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 14491952047f5..3b6b4cb400f42 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -2212,6 +2212,7 @@ static void null_destroy_dev(struct nullb *nullb)
 	struct nullb_device *dev = nullb->dev;
 
 	null_del_dev(nullb);
+	null_free_device_storage(dev, false);
 	null_free_dev(dev);
 }
 
-- 
2.39.2