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    Subject[PATCH 5.10 666/717] mtd: core: Fix refcounting for unpartitioned MTDs
    Date
    From: Richard Weinberger <richard@nod.at>

    commit 1ca71415f075353974524e96ed175306d8a937a8 upstream.

    Apply changes to usecount also to the master partition.
    Otherwise we have no refcounting at all if an MTD has no partitions.

    Cc: stable@vger.kernel.org
    Fixes: 46b5889cc2c5 ("mtd: implement proper partition handling")
    Signed-off-by: Richard Weinberger <richard@nod.at>
    Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
    Link: https://lore.kernel.org/linux-mtd/20201206202220.27290-1-richard@nod.at
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/mtd/mtdcore.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/mtd/mtdcore.c
    +++ b/drivers/mtd/mtdcore.c
    @@ -993,6 +993,8 @@ int __get_mtd_device(struct mtd_info *mt
    }
    }

    + master->usecount++;
    +
    while (mtd->parent) {
    mtd->usecount++;
    mtd = mtd->parent;
    @@ -1059,6 +1061,8 @@ void __put_mtd_device(struct mtd_info *m
    mtd = mtd->parent;
    }

    + master->usecount--;
    +
    if (master->_put_device)
    master->_put_device(master);


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