linux-kernel - [PATCH 3/3] mtd: mtdconcat: add suspend lock handling

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Date:   Mon, 11 Oct 2021 13:52:53 +0200
From:   Sean Nyekjaer <sean@...nix.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     Sean Nyekjaer <sean@...nix.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] mtd: mtdconcat: add suspend lock handling

Use new suspend lock handling for this special case for concatenated
MTD devices.

Fixes: 013e6292aaf5 ("mtd: rawnand: Simplify the locking")
Signed-off-by: Sean Nyekjaer <sean@...nix.com>
---
 drivers/mtd/mtdconcat.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index f685a581df48..c497c851481f 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -561,25 +561,32 @@ static void concat_sync(struct mtd_info *mtd)
 
 static int concat_suspend(struct mtd_info *mtd)
 {
+	struct mtd_info *master = mtd_get_master(mtd);
 	struct mtd_concat *concat = CONCAT(mtd);
 	int i, rc = 0;
 
 	for (i = 0; i < concat->num_subdev; i++) {
 		struct mtd_info *subdev = concat->subdev[i];
-		if ((rc = mtd_suspend(subdev)) < 0)
+
+		down_write(&master->master.suspend_lock);
+		if ((rc = __mtd_suspend(subdev)) < 0)
 			return rc;
+		up_write(&master->master.suspend_lock);
 	}
 	return rc;
 }
 
 static void concat_resume(struct mtd_info *mtd)
 {
+	struct mtd_info *master = mtd_get_master(mtd);
 	struct mtd_concat *concat = CONCAT(mtd);
 	int i;
 
 	for (i = 0; i < concat->num_subdev; i++) {
 		struct mtd_info *subdev = concat->subdev[i];
-		mtd_resume(subdev);
+		down_write(&master->master.suspend_lock);
+		__mtd_resume(subdev);
+		up_write(&master->master.suspend_lock);
 	}
 }
 
-- 
2.33.0