linux-kernel - [PATCH 2/6] Revert "mtd: fix: avoid race condition when accessing mtd->usecount"

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Message-ID: <20210613113035.2329421-3-chengzhihao1@huawei.com>
Date:   Sun, 13 Jun 2021 19:30:31 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <chengzhihao1@...wei.com>, <yukuai3@...wei.com>
Subject: [PATCH 2/6] Revert "mtd: fix: avoid race condition when accessing mtd->usecount"

This reverts commit 073db4a51ee43ccb827f54a4261c0583b028d5ab.
---
 drivers/mtd/mtd_blkdevs.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 16ccce3e7fdb..00b13f71ccf3 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -210,7 +210,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
 	mutex_lock(&dev->lock);
-	mutex_lock(&mtd_table_mutex);
 
 	if (dev->open)
 		goto unlock;
@@ -234,7 +233,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 
 unlock:
 	dev->open++;
-	mutex_unlock(&mtd_table_mutex);
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
 	return ret;
@@ -245,7 +243,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 error_put:
 	module_put(dev->tr->owner);
 	kref_put(&dev->ref, blktrans_dev_release);
-	mutex_unlock(&mtd_table_mutex);
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
 	return ret;
@@ -259,7 +256,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 		return;
 
 	mutex_lock(&dev->lock);
-	mutex_lock(&mtd_table_mutex);
 
 	if (--dev->open)
 		goto unlock;
@@ -273,7 +269,6 @@ static void blktrans_release(struct gendisk *disk, fmode_t mode)
 		__put_mtd_device(dev->mtd);
 	}
 unlock:
-	mutex_unlock(&mtd_table_mutex);
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
 }
-- 
2.31.1