[openwrt/openwrt] kernel: fix deferred mtdblock registration

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/e9c8c834de60a9199a41664c06430e74d15f2973

commit e9c8c834de60a9199a41664c06430e74d15f2973
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Mon Apr 12 21:40:35 2021 +0100

    kernel: fix deferred mtdblock registration
    
    Check if gendisk is already up instead of trying to figure out parent
    mtd device (which didn't work well).
    
    Reported-by: DENG Qingfang <dqfext at gmail.com>
    Reported-by: Koen Vandeputte <koen.vandeputte at citymesh.com>
    Fixes: 2809d0000744 ("kernel: support FIT partition parser on mtdblock devices")
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 ...mtd-blktrans-call-add-disks-after-mtd-device.patch | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch b/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
index 77ecd9b72f..c8c86ad255 100644
--- a/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
+++ b/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
@@ -39,24 +39,19 @@ Signed-off-by: Daniel Golle <daniel at makrotopia.org>
  	return 0;
  error4:
  	kfree(new->tag_set);
-@@ -475,6 +468,32 @@ error1:
+@@ -475,6 +468,27 @@ error1:
  	return ret;
  }
  
-+void register_mtd_blktrans_devs(struct mtd_info *mtd)
++void register_mtd_blktrans_devs(void)
 +{
 +	struct mtd_blktrans_ops *tr;
 +	struct mtd_blktrans_dev *dev, *next;
-+	struct mtd_info *top_mtd;
 +	int ret;
 +
 +	list_for_each_entry(tr, &blktrans_majors, list) {
 +		list_for_each_entry_safe(dev, next, &tr->devs, list) {
-+			top_mtd = dev->mtd;
-+			while (top_mtd->parent)
-+				top_mtd = top_mtd->parent;
-+
-+			if (mtd->index != top_mtd->index)
++			if (dev->disk->flags & GENHD_FL_UP)
 +				continue;
 +
 +			device_add_disk(&dev->mtd->dev, dev->disk, NULL);
@@ -86,18 +81,18 @@ Signed-off-by: Daniel Golle <daniel at makrotopia.org>
  		register_reboot_notifier(&mtd->reboot_notifier);
  	}
  
-+	register_mtd_blktrans_devs(mtd);
++	register_mtd_blktrans_devs();
 +
  out:
  	if (ret && device_is_registered(&mtd->dev))
  		del_mtd_device(mtd);
 --- a/include/linux/mtd/blktrans.h
 +++ b/include/linux/mtd/blktrans.h
-@@ -76,6 +76,7 @@ extern int deregister_mtd_blktrans(struc
+@@ -76,6 +76,6 @@ extern int deregister_mtd_blktrans(struc
  extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
-+extern void register_mtd_blktrans_devs(struct mtd_info *mtd);
- 
+-
++extern void register_mtd_blktrans_devs(void);
  
  #endif /* __MTD_TRANS_H__ */