linux-kernel - [PATCH v2 03/46] mtd: Don't unconditionally unregister reboot notifier

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Message-Id: <f83b7dd1edbee967b352aa3c2dab676bafd63a56.1474450295.git.dwalter@sigma-star.at>
Date:   Wed, 21 Sep 2016 11:45:12 +0200
From:   Daniel Walter <dwalter@...ma-star.at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, computersforpeace@...il.com,
        Richard Weinberger <richard@....at>
Subject: [PATCH v2 03/46] mtd: Don't unconditionally unregister reboot notifier

From: Richard Weinberger <richard@....at>

del_mtd_device() is allowed to fail.
i.e. when the MTD is busy.
Unregister the reboot notifier only when we're really
about to delete the MTD.

Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/mtd/mtdcore.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index e3936b8..36e5fb0 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -654,17 +654,22 @@ 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;
 
 	if (!device_is_registered(&master->dev))
-		return 0;
+		goto unregister;
 
-	return del_mtd_device(master);
+	err = del_mtd_device(master);
+	if (err)
+		return err;
+
+unregister:
+	if (master->_reboot)
+		unregister_reboot_notifier(&master->reboot_notifier);
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(mtd_device_unregister);
 
-- 
2.8.3