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- From 0bccc3722bdd88e8ae995e77ef9f7b77ee4cbdee Mon Sep 17 00:00:00 2001
- From: Daniel Golle <[email protected]>
- Date: Wed, 7 Apr 2021 22:45:54 +0100
- Subject: [PATCH 2/2] mtd: blktrans: call add disks after mtd device
- To: [email protected]
- Cc: Vignesh Raghavendra <[email protected]>,
- Richard Weinberger <[email protected]>,
- Miquel Raynal <[email protected]>,
- David Woodhouse <[email protected]>
- Calling device_add_disk while holding mtd_table_mutex leads
- to deadlock in case part_bits!=0 as block partition parsers
- will try to open the newly created disks, trying to acquire
- mutex once again.
- Move device_add_disk to additional function called after
- add partitions of an MTD device have been added and locks
- have been released.
- Signed-off-by: Daniel Golle <[email protected]>
- ---
- drivers/mtd/mtd_blkdevs.c | 33 ++++++++++++++++++++++++++-------
- drivers/mtd/mtdcore.c | 3 +++
- include/linux/mtd/blktrans.h | 1 +
- 3 files changed, 30 insertions(+), 7 deletions(-)
- --- a/drivers/mtd/mtd_blkdevs.c
- +++ b/drivers/mtd/mtd_blkdevs.c
- @@ -457,13 +457,6 @@ int add_mtd_blktrans_dev(struct mtd_blkt
- if (new->readonly)
- set_disk_ro(gd, 1);
-
- - device_add_disk(&new->mtd->dev, gd, NULL);
- -
- - if (new->disk_attributes) {
- - ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
- - new->disk_attributes);
- - WARN_ON(ret);
- - }
- return 0;
- error4:
- kfree(new->tag_set);
- @@ -475,6 +468,27 @@ error1:
- return ret;
- }
-
- +void register_mtd_blktrans_devs(void)
- +{
- + struct mtd_blktrans_ops *tr;
- + struct mtd_blktrans_dev *dev, *next;
- + int ret;
- +
- + list_for_each_entry(tr, &blktrans_majors, list) {
- + list_for_each_entry_safe(dev, next, &tr->devs, list) {
- + if (disk_live(dev->disk))
- + continue;
- +
- + device_add_disk(&dev->mtd->dev, dev->disk, NULL);
- + if (dev->disk_attributes) {
- + ret = sysfs_create_group(&disk_to_dev(dev->disk)->kobj,
- + dev->disk_attributes);
- + WARN_ON(ret);
- + }
- + }
- + }
- +}
- +
- int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
- {
- unsigned long flags;
- --- a/drivers/mtd/mtdcore.c
- +++ b/drivers/mtd/mtdcore.c
- @@ -31,6 +31,7 @@
-
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
- +#include <linux/mtd/blktrans.h>
-
- #include "mtdcore.h"
-
- @@ -851,6 +852,8 @@ int mtd_device_parse_register(struct mtd
- register_reboot_notifier(&mtd->reboot_notifier);
- }
-
- + 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
- 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(void);
-
- /**
- * module_mtd_blktrans() - Helper macro for registering a mtd blktrans driver
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