linux-kernel - [PATCH 2/2] mtd: ubi: block: wire-up device parent

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Date:   Thu, 22 Dec 2022 19:33:31 +0000
From:   Daniel Golle <daniel@...rotopia.org>
To:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vignesh Raghavendra <vigneshr@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 2/2] mtd: ubi: block: wire-up device parent

ubiblock devices were previously only identifyable by their name, but
not connected to their parent UBI volume device e.g. in sysfs.
Properly parent ubiblock device as descendant of a UBI volume device
to reflect device model hierachy.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/mtd/ubi/block.c | 2 +-
 drivers/mtd/ubi/kapi.c  | 1 +
 include/linux/mtd/ubi.h | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index d725215ae66e5..e99b29ba48dc4 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -455,7 +455,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 	list_add_tail(&dev->list, &ubiblock_devices);
 
 	/* Must be the last step: anyone can call file ops from now on */
-	ret = add_disk(dev->gd);
+	ret = device_add_disk(vi->dev, dev->gd, NULL);
 	if (ret)
 		goto out_destroy_wq;
 
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 0fce99ff29b58..5db653eacbd45 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -79,6 +79,7 @@ void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
 	vi->name_len = vol->name_len;
 	vi->name = vol->name;
 	vi->cdev = vol->cdev.dev;
+	vi->dev = &vol->dev;
 }
 
 /**
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 7d48ea368c5e5..a529347fd75b2 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -110,6 +110,7 @@ struct ubi_volume_info {
 	int name_len;
 	const char *name;
 	dev_t cdev;
+	struct device *dev;
 };
 
 /**
-- 
2.39.0