kernel: 6.1: backport UBI device model improvements

Backport two commits from Linux 6.3 wiring up device node parents of
ubi devices (pointing to their MTD parent) as well as ubiblock devices
(poiting to their parent UBI volume).

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/bcm53xx/patches-6.1/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch

@@ -49,7 +49,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  			return UBI_IO_BAD_HDR_EBADMSG;
 --- a/drivers/mtd/ubi/ubi.h
 +++ b/drivers/mtd/ubi/ubi.h
-@@ -820,6 +820,7 @@ extern struct mutex ubi_devices_mutex;
+@@ -822,6 +822,7 @@ extern struct mutex ubi_devices_mutex;
  extern struct blocking_notifier_head ubi_notifiers;
  
  /* attach.c */

target/linux/generic/backport-6.1/424-v6.3-mtd-ubi-wire-up-parent-MTD-device.patch

@@ -0,0 +1,33 @@
+From 1ecf9e390452e73a362ea7fbde8f3f0db83de856 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Thu, 22 Dec 2022 19:33:04 +0000
+Subject: [PATCH] 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@makrotopia.org>
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+ drivers/mtd/ubi/build.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/mtd/ubi/build.c
++++ b/drivers/mtd/ubi/build.c
+@@ -929,6 +929,7 @@ int ubi_attach_mtd_dev(struct mtd_info *
+ 	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;

target/linux/generic/backport-6.1/425-v6.3-mtd-ubi-block-wire-up-device-parent.patch

@@ -0,0 +1,49 @@
+From 05b8773ca33253ea562be145cf3145b05ef19f86 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Thu, 22 Dec 2022 19:33:31 +0000
+Subject: [PATCH] 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@makrotopia.org>
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+ 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(-)
+
+--- a/drivers/mtd/ubi/block.c
++++ b/drivers/mtd/ubi/block.c
+@@ -452,7 +452,7 @@ int ubiblock_create(struct ubi_volume_in
+ 	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;
+ 
+--- a/drivers/mtd/ubi/kapi.c
++++ b/drivers/mtd/ubi/kapi.c
+@@ -79,6 +79,7 @@ void ubi_do_get_volume_info(struct ubi_d
+ 	vi->name_len = vol->name_len;
+ 	vi->name = vol->name;
+ 	vi->cdev = vol->cdev.dev;
++	vi->dev = &vol->dev;
+ }
+ 
+ /**
+--- 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;
+ };
+ 
+ /**

target/linux/generic/pending-6.1/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch

@@ -8,7 +8,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 
 --- a/drivers/mtd/ubi/build.c
 +++ b/drivers/mtd/ubi/build.c
-@@ -1212,6 +1212,73 @@ static struct mtd_info * __init open_mtd
+@@ -1213,6 +1213,73 @@ static struct mtd_info * __init open_mtd
  	return mtd;
  }
  
@@ -82,7 +82,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  static int __init ubi_init(void)
  {
  	int err, i, k;
-@@ -1296,6 +1363,12 @@ static int __init ubi_init(void)
+@@ -1297,6 +1364,12 @@ static int __init ubi_init(void)
  		}
  	}