linux-kernel - block: check for dying queue in generic_make

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Date:	Wed, 16 Apr 2014 20:31:57 -0700
From:	Asai Thambi S P <asamymuthupa@...ron.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Sam Bradshaw <sbradshaw@...ron.com>
Subject: block: check for dying queue in generic_make_request()

Check for dying queue is in request queue interface, but not for direct use
of make_request().

When a mounted device is surprise removed, block drivers delete gendisk and
cleanup request queue. As the reference count is non-zero, these structures
continue to exist and any further I/O request is passed on to block drivers.
With respect to the block driver, the device is removed and cleaned up the
data structures. This check will stop I/O to a non-existent device at the
block layer.

Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
---
 block/blk-core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index e45b321..cec6bf4 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1713,7 +1713,7 @@ generic_make_request_checks(struct bio *bio)
 		goto end_io;

 	q = bdev_get_queue(bio->bi_bdev);
-	if (unlikely(!q)) {
+	if (unlikely(!q || blk_queue_dying(q))) {
 		printk(KERN_ERR
 		       "generic_make_request: Trying to access "
 			"nonexistent block-device %s (%Lu)\n",
-- 
1.7.1

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