[PATCH 1/9] MTD: call remove notifiers before removing the device

Maxim Levitsky
2010-01-12T19:29:55Z

>From 1855da2a21882c803e5dfcfb556fff5bc6989c31 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Fri, 8 Jan 2010 15:14:20 +0200
Subject: [PATCH 1/9] MTD: call remove notifiers before removing the device

This is first step in implementing proper hotplug support.
Now all users of the mtd device have a chance to put the mtd device
when they are notified to do so, and they have to do so to make hotplug work.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
drivers/mtd/mtdcore.c | 21 +++++++++++----------
1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index c356c0a..87ff83f 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -341,31 +341,32 @@ int add_mtd_device(struct mtd_info *mtd)
int del_mtd_device (struct mtd_info *mtd)
{
int ret;
+ struct mtd_notifier *not;

mutex_lock(&mtd_table_mutex);

if (mtd_table[mtd->index] != mtd) {
ret = -ENODEV;
- } else if (mtd->usecount) {
+ goto out_error;
+ }
+
+ /* No need to get a refcount on the module containing
+ the notifier, since we hold the mtd_table_mutex */
+ list_for_each_entry(not, &mtd_notifiers, list)
+ not->remove(mtd);
+
+ if (mtd->usecount) {
printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
mtd->index, mtd->name, mtd->usecount);
ret = -EBUSY;
} else {
- struct mtd_notifier *not;
-
device_unregister(&mtd->dev);
-
- /* No need to get a refcount on the module containing
- the notifier, since we hold the mtd_table_mutex */
- list_for_each_entry(not, &mtd_notifiers, list)
- not->remove(mtd);
-
mtd_table[mtd->index] = NULL;
-
module_put(THIS_MODULE);
ret = 0;
}

+out_error:
mutex_unlock(&mtd_table_mutex);
return ret;
}
--
1.6.3.3