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>

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 4c61187..cbc0fc4 100644 (file)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -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;

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 031ff3a..c06f537 100644 (file)
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -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.