d33e49857e
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
|
|
From: Daniel Golle <daniel@makrotopia.org>
|
|
Date: Wed, 7 Apr 2021 22:45:54 +0100
|
|
Subject: [PATCH 2/2] mtd: blktrans: call add disks after mtd device
|
|
To: linux-mtd@lists.infradead.org
|
|
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
|
|
Richard Weinberger <richard@nod.at>,
|
|
Miquel Raynal <miquel.raynal@bootlin.com>,
|
|
David Woodhouse <dwmw2@infradead.org>
|
|
|
|
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 <daniel@makrotopia.org>
|
|
---
|
|
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
|
|
@@ -384,13 +384,6 @@ 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;
|
|
|
|
out_free_tag_set:
|
|
@@ -402,6 +395,27 @@ out_list_del:
|
|
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
|
|
@@ -32,6 +32,7 @@
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
+#include <linux/mtd/blktrans.h>
|
|
|
|
#include "mtdcore.h"
|
|
|
|
@@ -1079,6 +1080,8 @@ int mtd_device_parse_register(struct mtd
|
|
|
|
ret = mtd_otp_nvmem_add(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
|
|
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
|