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mtd: implement common reboot notifier boilerplate 

cfi_cmdset_000{1,2}.c already implement their own reboot notifiers, and
we're going to add one for NAND. Let's put the boilerplate in one place.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
This commit is contained in:
Brian Norris 2014-11-26 01:01:08 -08:00
parent 362376a7c6
commit 3efe41be22
2 changed files with 21 additions and 0 deletions
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20
drivers/mtd/mtdcore.c
View File

@ -37,6 +37,7 @@
#include <linux/backing-dev.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/reboot.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@ -365,6 +366,17 @@ static struct device_type mtd_devtype = {
.release = mtd_release,
};
static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state,
void *cmd)
{
struct mtd_info *mtd;
mtd = container_of(n, struct mtd_info, reboot_notifier);
mtd->_reboot(mtd);
return NOTIFY_DONE;
}
/**
* add_mtd_device - register an MTD device
* @mtd: pointer to new MTD device info structure
@ -565,6 +577,11 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
err = -ENODEV;
}
if (mtd->_reboot) {
mtd->reboot_notifier.notifier_call = mtd_reboot_notifier;
register_reboot_notifier(&mtd->reboot_notifier);
}
return err;
}
EXPORT_SYMBOL_GPL(mtd_device_parse_register);
@ -579,6 +596,9 @@ int mtd_device_unregister(struct mtd_info *master)
{
int err;
if (master->_reboot)
unregister_reboot_notifier(&master->reboot_notifier);
err = del_mtd_partitions(master);
if (err)
return err;

1
include/linux/mtd/mtd.h
View File

@ -227,6 +227,7 @@ struct mtd_info {
int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
int (*_suspend) (struct mtd_info *mtd);
void (*_resume) (struct mtd_info *mtd);
void (*_reboot) (struct mtd_info *mtd);
/*
* If the driver is something smart, like UBI, it may need to maintain
* its own reference counting. The below functions are only for driver.