From: Richard Weinberger <richard@nod.at>
Date: Sun, 6 Dec 2020 20:22:20 +0000 (+0100)
Subject: mtd: core: Fix refcounting for unpartitioned MTDs
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1ca71415f075353974524e96ed175306d8a937a8;p=linux.git

mtd: core: Fix refcounting for unpartitioned MTDs

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
---

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 31d1be4b22617..2d6423d89a175 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -993,6 +993,8 @@ int __get_mtd_device(struct mtd_info *mtd)
 		}
 	}
 
+	master->usecount++;
+
 	while (mtd->parent) {
 		mtd->usecount++;
 		mtd = mtd->parent;
@@ -1059,6 +1061,8 @@ void __put_mtd_device(struct mtd_info *mtd)
 		mtd = mtd->parent;
 	}
 
+	master->usecount--;
+
 	if (master->_put_device)
 		master->_put_device(master);