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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tang Junhui <tang.junhui.linux@gmail.com>,
        Coly Li <colyli@suse.de>, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.19 013/361] bcache: fix ioctl in flash device
Date:   Sun, 11 Nov 2018 14:16:00 -0800
Message-Id: <20181111221621.792101493@linuxfoundation.org>
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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tang Junhui <tang.junhui.linux@gmail.com>

commit dd0c91793b7c2658ea32c6b3a2247a8ceca45dc0 upstream.

When doing ioctl in flash device, it will call ioctl_dev() in super.c,
then we should not to get cached device since flash only device has
no backend device. This patch just move the jugement dc->io_disable
to cached_dev_ioctl() to make ioctl in flash device correctly.

Fixes: 0f0709e6bfc3c ("bcache: stop bcache device when backing device is offline")
Signed-off-by: Tang Junhui <tang.junhui.linux@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/bcache/request.c |    3 +++
 drivers/md/bcache/super.c   |    4 ----
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1218,6 +1218,9 @@ static int cached_dev_ioctl(struct bcach
 {
 	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
 
+	if (dc->io_disable)
+		return -EIO;
+
 	return __blkdev_driver_ioctl(dc->bdev, mode, cmd, arg);
 }
 
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -643,10 +643,6 @@ static int ioctl_dev(struct block_device
 		     unsigned int cmd, unsigned long arg)
 {
 	struct bcache_device *d = b->bd_disk->private_data;
-	struct cached_dev *dc = container_of(d, struct cached_dev, disk);
-
-	if (dc->io_disable)
-		return -EIO;
 
 	return d->ioctl(d, mode, cmd, arg);
 }