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From: Zhihao Cheng <chengzhihao1@huawei.com>
To: <miquel.raynal@bootlin.com>, <richard@nod.at>, <vigneshr@ti.com>
Cc: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<chengzhihao1@huawei.com>, <yukuai3@huawei.com>
Subject: [PATCH 2/6] Revert "mtd: fix: avoid race condition when accessing mtd->usecount"
Date: Sun, 13 Jun 2021 19:30:31 +0800	[thread overview]
Message-ID: <20210613113035.2329421-3-chengzhihao1@huawei.com> (raw)
In-Reply-To: <20210613113035.2329421-1-chengzhihao1@huawei.com>

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


WARNING: multiple messages have this Message-ID (diff)
From: Zhihao Cheng <chengzhihao1@huawei.com>
To: <miquel.raynal@bootlin.com>, <richard@nod.at>, <vigneshr@ti.com>
Cc: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<chengzhihao1@huawei.com>, <yukuai3@huawei.com>
Subject: [PATCH 2/6] Revert "mtd: fix: avoid race condition when accessing mtd->usecount"
Date: Sun, 13 Jun 2021 19:30:31 +0800	[thread overview]
Message-ID: <20210613113035.2329421-3-chengzhihao1@huawei.com> (raw)
In-Reply-To: <20210613113035.2329421-1-chengzhihao1@huawei.com>

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


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  parent reply	other threads:[~2021-06-13 11:22 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-13 11:30 [PATCH 0/6] Fix deadlock in ftl formating on mtd Zhihao Cheng
2021-06-13 11:30 ` Zhihao Cheng
2021-06-13 11:30 ` [PATCH 1/6] Revert "mtd: blkdevs: fix potential deadlock + lockdep warnings" Zhihao Cheng
2021-06-13 11:30   ` Zhihao Cheng
2021-06-13 11:30 ` Zhihao Cheng [this message]
2021-06-13 11:30   ` [PATCH 2/6] Revert "mtd: fix: avoid race condition when accessing mtd->usecount" Zhihao Cheng
2021-06-13 11:30 ` [PATCH 3/6] Revert "mtd: mtd_blkdevs: don't increase 'open' count on error path" Zhihao Cheng
2021-06-13 11:30   ` Zhihao Cheng
2021-06-13 11:30 ` [PATCH 4/6] Revert "mtd: mtd_blkdevs: fix error path in blktrans_open" Zhihao Cheng
2021-06-13 11:30   ` Zhihao Cheng
2021-06-13 11:30 ` [PATCH 5/6] Revert "mtd: Remove redundant mutex from mtd_blkdevs.c" Zhihao Cheng
2021-06-13 11:30   ` Zhihao Cheng
2021-06-13 11:30 ` [PATCH 6/6] Revert "mtd: allow to unload the mtdtrans module if its block devices aren't open" Zhihao Cheng
2021-06-13 11:30   ` Zhihao Cheng
2021-06-13 15:12 ` [PATCH 0/6] Fix deadlock in ftl formating on mtd Miquel Raynal
2021-06-13 15:12   ` Miquel Raynal
2021-06-15  9:02   ` Zhihao Cheng
2021-06-15  9:02     ` Zhihao Cheng
2021-06-15  9:08   ` Zhihao Cheng
2021-06-15  9:08     ` Zhihao Cheng

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