[PATCH 05/15] MTD: call the remove notifiers before assuming it is in use

Maxim Levitsky
2010-02-22T18:40:13Z

Now that mtd block common layer is prepared for proper hotplug support,
enable it here

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 | 19 +++++++++++--------
1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 67669a7..70a7858 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -350,31 +350,34 @@ fail_locked:
int del_mtd_device (struct mtd_info *mtd)
{
int ret;
+ struct mtd_notifier *not;

mutex_lock(&mtd_table_mutex);

if (idr_find(&mtd_idr, 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);
-
idr_remove(&mtd_idr, mtd->index);

module_put(THIS_MODULE);
ret = 0;
}

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