linux-kernel - [PATCH] mtd:Fix issue where write_cached_data() fails but write() still returns success

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Date:   Fri, 20 Mar 2020 11:15:11 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>
CC:     <nixiaoming@...wei.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <zhangweimin12@...wei.com>,
        <wangle6@...wei.com>
Subject: [PATCH] mtd:Fix issue where write_cached_data() fails but write() still returns success

mtdblock_flush()
	-->write_cached_data()
		--->erase_write()
		     mtdblock: erase of region [0x40000, 0x20000] on "xxx" failed

Because mtdblock_flush() always returns 0,
even if write_cached_data() fails and data is not written to the device,
syscall_write() still returns success

Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
---
 drivers/mtd/mtdblock.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index c06b532..078e0f6 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -294,12 +294,13 @@ static void mtdblock_release(struct mtd_blktrans_dev *mbd)
 static int mtdblock_flush(struct mtd_blktrans_dev *dev)
 {
 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
+	int ret;
 
 	mutex_lock(&mtdblk->cache_mutex);
-	write_cached_data(mtdblk);
+	ret = write_cached_data(mtdblk);
 	mutex_unlock(&mtdblk->cache_mutex);
 	mtd_sync(dev->mtd);
-	return 0;
+	return ret;
 }
 
 static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
-- 
1.8.5.6