linux-kernel - Re: [PATCH] [MTD] Only call mtd->sync() method in mtdblock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <1326552921.19039.75.camel@sauron.fi.intel.com>
Date:	Sat, 14 Jan 2012 16:55:21 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [MTD] Only call mtd->sync() method in mtdblock_release
 if opened for write.

On Tue, 2012-01-10 at 13:26 +0100, Alexander Stein wrote:
> Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>

Added commit message, amended the patch, and pushed to l2-mtd.git,
thanks!


From 961aa500ce7592a4ac917b7b56a15d1998722acf Mon Sep 17 00:00:00 2001
From: Alexander Stein <alexander.stein@...tec-electronic.com>
Date: Tue, 10 Jan 2012 13:26:58 +0100
Subject: [PATCH] mtd: mtdblock: call mtd_sync() only if opened for write

Because it is useless to call it if the device is opened in R/O mode, and also
harmful: on CFI NOR flash it may block for long time waiting for erase
operations to complete is another partition with a R/W file-system on this
chip.

Artem Bityutskiy: write commit message, amend the patch to match the latest
tree (we use mtd_sync(), not mtd->sync() nowadays).

Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
---
 drivers/mtd/mtd_blkdevs.c    |    1 +
 drivers/mtd/mtdblock.c       |    8 ++++++--
 include/linux/mtd/blktrans.h |    1 +
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 424ca5f..f1f0671 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -233,6 +233,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 	ret = __get_mtd_device(dev->mtd);
 	if (ret)
 		goto error_release;
+	dev->file_mode = mode;
 
 unlock:
 	dev->open++;
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index af65912..6c6d807 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -321,8 +321,12 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd)
 	mutex_unlock(&mtdblk->cache_mutex);
 
 	if (!--mtdblk->count) {
-		/* It was the last usage. Free the cache */
-		mtd_sync(mbd->mtd);
+		/*
+		 * It was the last usage. Free the cache, but only sync if
+		 * opened for writing.
+		 */
+		if (mbd->file_mode & FMODE_WRITE)
+			mtd_sync(mbd->mtd);
 		vfree(mtdblk->cache_data);
 	}
 
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
index 1bbd9f2..ed270bd 100644
--- a/include/linux/mtd/blktrans.h
+++ b/include/linux/mtd/blktrans.h
@@ -47,6 +47,7 @@ struct mtd_blktrans_dev {
 	struct request_queue *rq;
 	spinlock_t queue_lock;
 	void *priv;
+	fmode_t file_mode;
 };
 
 struct mtd_blktrans_ops {
-- 
1.7.7.5


-- 
Best Regards,
Artem Bityutskiy

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)