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This DT property allows marking flash partition that Linux should use as a root device. It's useful for devices that don't use U-Boot and cmdline parser for partitioning. It may be used with "fixed-partitions" or some dynamic partitioning based on flash content. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
99 lines
2.8 KiB
Diff
99 lines
2.8 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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@@ -384,13 +384,6 @@ 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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out_free_tag_set:
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@@ -402,6 +395,27 @@ out_list_del:
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return ret;
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}
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+void register_mtd_blktrans_devs(void)
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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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+ 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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+ if (disk_live(dev->disk))
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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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@@ -1079,6 +1080,8 @@ int mtd_device_parse_register(struct mtd
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ret = mtd_otp_nvmem_add(mtd);
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+ register_mtd_blktrans_devs();
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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(void);
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/**
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* module_mtd_blktrans() - Helper macro for registering a mtd blktrans driver
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