[PATCH] cdev: fix mtd partition handling

[Sascha Hauer <s.hauer@pengutronix.de>]

devfs-core.c implements the partition handling only for devices that are
not MTD devices. MTD devices have their own partition handling in
drivers/mtd/partition.c, see the special case in __devfs_add_partition()
for MTD devices. This means for MTD devices we have to pass the original
cdev to the ops, not the master cdev.

Fixes: 6d2b6f399c07 ("cdev: pass master cdev to cdev ops")
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 fs/devfs-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/devfs-core.c b/fs/devfs-core.c
index 52490576b7..9c2dae5545 100644
--- a/fs/devfs-core.c
+++ b/fs/devfs-core.c
@@ -226,6 +226,10 @@ int cdev_find_free_index(const char *basename)
 
 static struct cdev *cdev_get_master(struct cdev *cdev)
 {
+	/* mtd devices handle partitions themselves */
+	if (cdev->mtd)
+		return cdev;
+
 	while (cdev && cdev_is_partition(cdev))
 		cdev = cdev->master;
 
-- 
2.39.5