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2809d00007
Allow using the FIT block-device partition partition parser to work on top of mtdblock devices. This is more tricky than it sounds as it requires to reorganize the procedure of registering mtdblock devices in order to avoid locking troubles caused by the block partition parsers then trying to open the mtdblock device for reading while locks are still being held. Fix that by moving the adding of the disks after the entire device has been probed when locks no longer need to be held. Also address issue with mtdsuper surfaced when using sub-partitions which prevented mounting JFFS2 using the /dev/mtdblock* device. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
104 lines
3.0 KiB
Diff
104 lines
3.0 KiB
Diff
From 0bccc3722bdd88e8ae995e77ef9f7b77ee4cbdee Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Wed, 7 Apr 2021 22:45:54 +0100
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Subject: [PATCH 2/2] mtd: blktrans: call add disks after mtd device
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To: linux-mtd@lists.infradead.org
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Cc: Vignesh Raghavendra <vigneshr@ti.com>,
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Richard Weinberger <richard@nod.at>,
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Miquel Raynal <miquel.raynal@bootlin.com>,
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David Woodhouse <dwmw2@infradead.org>
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Calling device_add_disk while holding mtd_table_mutex leads
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to deadlock in case part_bits!=0 as block partition parsers
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will try to open the newly created disks, trying to acquire
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mutex once again.
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Move device_add_disk to additional function called after
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add partitions of an MTD device have been added and locks
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have been released.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/mtd/mtd_blkdevs.c | 33 ++++++++++++++++++++++++++-------
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drivers/mtd/mtdcore.c | 3 +++
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include/linux/mtd/blktrans.h | 1 +
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3 files changed, 30 insertions(+), 7 deletions(-)
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--- a/drivers/mtd/mtd_blkdevs.c
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+++ b/drivers/mtd/mtd_blkdevs.c
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@@ -457,13 +457,6 @@ int add_mtd_blktrans_dev(struct mtd_blkt
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if (new->readonly)
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set_disk_ro(gd, 1);
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- device_add_disk(&new->mtd->dev, gd, NULL);
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-
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- if (new->disk_attributes) {
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- ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
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- new->disk_attributes);
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- WARN_ON(ret);
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- }
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return 0;
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error4:
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kfree(new->tag_set);
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@@ -475,6 +468,32 @@ error1:
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return ret;
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}
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+void register_mtd_blktrans_devs(struct mtd_info *mtd)
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+{
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+ struct mtd_blktrans_ops *tr;
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+ struct mtd_blktrans_dev *dev, *next;
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+ struct mtd_info *top_mtd;
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+ int ret;
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+
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+ list_for_each_entry(tr, &blktrans_majors, list) {
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+ list_for_each_entry_safe(dev, next, &tr->devs, list) {
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+ top_mtd = dev->mtd;
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+ while (top_mtd->parent)
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+ top_mtd = top_mtd->parent;
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+
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+ if (mtd->index != top_mtd->index)
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+ continue;
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+
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+ device_add_disk(&dev->mtd->dev, dev->disk, NULL);
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+ if (dev->disk_attributes) {
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+ ret = sysfs_create_group(&disk_to_dev(dev->disk)->kobj,
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+ dev->disk_attributes);
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+ WARN_ON(ret);
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+ }
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+ }
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+ }
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+}
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+
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int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
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{
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unsigned long flags;
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -32,6 +32,7 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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+#include <linux/mtd/blktrans.h>
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#include "mtdcore.h"
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@@ -858,6 +859,8 @@ int mtd_device_parse_register(struct mtd
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register_reboot_notifier(&mtd->reboot_notifier);
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}
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+ register_mtd_blktrans_devs(mtd);
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+
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out:
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if (ret && device_is_registered(&mtd->dev))
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del_mtd_device(mtd);
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--- a/include/linux/mtd/blktrans.h
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+++ b/include/linux/mtd/blktrans.h
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@@ -76,6 +76,7 @@ extern int deregister_mtd_blktrans(struc
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extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
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+extern void register_mtd_blktrans_devs(struct mtd_info *mtd);
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#endif /* __MTD_TRANS_H__ */
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