linux-kernel - [PATCH 1/2] mtd: ubi: wire-up parent MTD device

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Message-ID: <39de7617513dfae3a0183b74aac119fbdc5141e9.1671737443.git.daniel@makrotopia.org>
Date:   Thu, 22 Dec 2022 19:33:04 +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 1/2] mtd: ubi: wire-up parent MTD device

Wire up the device parent pointer of UBI devices to their lower MTD
device, typically an MTD partition or whole-chip device.

The most noticeable change is that in sysfs, previously ubi devices
would be could in /sys/devices/virtual/ubi while after this change they
would be correctly attached to their parent MTD device, e.g.

/sys/devices/platform/1100d000.spi/spi_master/spi1/spi1.0/mtd/mtd2/ubi0.

Locating UBI devices using /sys/class/ubi/ of course still works as
well.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/mtd/ubi/build.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 5e90a4423b699..0904eb40c95fa 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -915,6 +915,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 	ubi->dev.release = dev_release;
 	ubi->dev.class = &ubi_class;
 	ubi->dev.groups = ubi_dev_groups;
+	ubi->dev.parent = &mtd->dev;

 	ubi->mtd = mtd;
 	ubi->ubi_num = ubi_num;
-- 
2.39.0