Patch "null_blk: Fix: memory release when memory_backed=1" has been added to the 6.3-stable tree

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

    null_blk: Fix: memory release when memory_backed=1

to the 6.3-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:
     null_blk-fix-memory-release-when-memory_backed-1.patch
and it can be found in the queue-6.3 subdirectory.

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



commit b2a9b2793036dd9e8b7e3dcb0d8d0ce014cb3f91
Author: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Date:   Mon Jun 5 11:53:53 2023 +0530

    null_blk: Fix: memory release when memory_backed=1
    
    [ 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@xxxxxxxxxxx>
    Signed-off-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230605062354.24785-1-nj.shetty@xxxxxxxxxxx
    Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

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);
 }
 



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