linux-kernel - [PATCH v2 04/46] mtd: Don't unconditionally execute remove notifiers

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Message-Id: <a1270d3354d565db4250d24f327cdbe228a62898.1474450295.git.dwalter@sigma-star.at>
Date:   Wed, 21 Sep 2016 11:45:47 +0200
From:   Daniel Walter <dwalter@...ma-star.at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, computersforpeace@...il.com,
        dwmw2@...radead.org, Richard Weinberger <richard@....at>
Subject: [PATCH v2 04/46] mtd: Don't unconditionally execute remove notifiers

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

Only call them when we're really removing the MTD.

Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/mtd/mtdcore.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 36e5fb0..b8205ec 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -499,16 +499,17 @@ int del_mtd_device(struct mtd_info *mtd)
 		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 {
+		/* 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);
+
 		device_unregister(&mtd->dev);
 
 		idr_remove(&mtd_idr, mtd->index);
-- 
2.8.3