linux-kernel - [PATCH v3 2/4] mtd: mtdconcat: add suspend lock handling

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Message-Id: <20211025092752.2824678-3-sean@geanix.com>
Date:   Mon, 25 Oct 2021 11:27:50 +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 v3 2/4] mtd: mtdconcat: add suspend lock handling

Use MTD hooks to control suspend/resume of MTD devices.
concat_{suspend,resume} will be called from mtd_{suspend,resume},
which already have taken the suspend/resume lock.
It's safe to proceed with calling MTD device hooks directly from here.

Fixes: 013e6292aaf5 ("mtd: rawnand: Simplify the locking")
Suggested-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Sean Nyekjaer <sean@...nix.com>
---
 drivers/mtd/mtdconcat.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index f685a581df48..37532f529820 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -566,9 +566,15 @@ static int concat_suspend(struct mtd_info *mtd)
 
 	for (i = 0; i < concat->num_subdev; i++) {
 		struct mtd_info *subdev = concat->subdev[i];
-		if ((rc = mtd_suspend(subdev)) < 0)
+		/*
+		 * Call MTD hook directly from here,
+		 * mtd_suspend() have the suspend/resume lock.
+		 */
+		rc = subdev->_suspend ? subdev->_suspend(subdev) : 0;
+		if (rc < 0)
 			return rc;
 	}
+
 	return rc;
 }
 
@@ -579,7 +585,12 @@ static void concat_resume(struct mtd_info *mtd)
 
 	for (i = 0; i < concat->num_subdev; i++) {
 		struct mtd_info *subdev = concat->subdev[i];
-		mtd_resume(subdev);
+		/*
+		 * Call MTD hook directly from here,
+		 * mtd_resume() have the suspend/resume lock.
+		 */
+		if (subdev->_resume)
+			subdev->_resume(subdev);
 	}
 }
 
-- 
2.33.0