From: Bart Van Assche <bart.vanassche@wdc.com>
Date: Tue, 10 Apr 2018 17:02:40 -0600
Subject: [PATCH] blk-mq: Avoid that submitting a bio concurrently with device
 removal triggers a crash
Git-commit: 37f9579f4c31a6d698dbf3016d7bf132f9288d30
Patch-Mainline: v4.17-rc1
References: bsc#1104967,FATE#325924,bsc#1131673

Because blkcg_exit_queue() is now called from inside blk_cleanup_queue()
it is no longer safe to access cgroup information during or after the
blk_cleanup_queue() call. Hence protect the generic_make_request_checks()
call with blk_queue_enter() / blk_queue_exit().

Reported-by: Ming Lei <ming.lei@redhat.com>
Fixes: a063057d7c73 ("block: Fix a race between request queue removal and the block cgroup controller")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 block/blk-core.c | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index abcb8684ba67..806ce2442819 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2385,8 +2385,20 @@ blk_qc_t generic_make_request(struct bio *bio)
 	 * yet.
 	 */
 	struct bio_list bio_list_on_stack[2];
+	blk_mq_req_flags_t flags = 0;
+	struct request_queue *q = bio->bi_disk->queue;
 	blk_qc_t ret = BLK_QC_T_NONE;
 
+	if (bio->bi_opf & REQ_NOWAIT)
+		flags = BLK_MQ_REQ_NOWAIT;
+	if (blk_queue_enter(q, flags) < 0) {
+		if (!blk_queue_dying(q) && (bio->bi_opf & REQ_NOWAIT))
+			bio_wouldblock_error(bio);
+		else
+			bio_io_error(bio);
+		return ret;
+	}
+
 	if (!generic_make_request_checks(bio))
 		goto out;
 
@@ -2423,11 +2435,22 @@ blk_qc_t generic_make_request(struct bio *bio)
 	bio_list_init(&bio_list_on_stack[0]);
 	current->bio_list = bio_list_on_stack;
 	do {
-		struct request_queue *q = bio->bi_disk->queue;
-		blk_mq_req_flags_t flags = bio->bi_opf & REQ_NOWAIT ?
-			BLK_MQ_REQ_NOWAIT : 0;
+		bool enter_succeeded = true;
+
+		if (unlikely(q != bio->bi_disk->queue)) {
+			if (q)
+				blk_queue_exit(q);
+			q = bio->bi_disk->queue;
+			flags = 0;
+			if (bio->bi_opf & REQ_NOWAIT)
+				flags = BLK_MQ_REQ_NOWAIT;
+			if (blk_queue_enter(q, flags) < 0) {
+				enter_succeeded = false;
+				q = NULL;
+			}
+		}
 
-		if (likely(blk_queue_enter(q, flags) == 0)) {
+		if (enter_succeeded) {
 			struct bio_list lower, same;
 
 			/* Create a fresh bio_list for all subordinate requests */
@@ -2435,8 +2458,6 @@ blk_qc_t generic_make_request(struct bio *bio)
 			bio_list_init(&bio_list_on_stack[0]);
 			ret = q->make_request_fn(q, bio);
 
-			blk_queue_exit(q);
-
 			/* sort new bios into those for a lower level
 			 * and those for the same level
 			 */
@@ -2463,6 +2484,8 @@ blk_qc_t generic_make_request(struct bio *bio)
 	current->bio_list = NULL; /* deactivate */
 
 out:
+	if (q)
+		blk_queue_exit(q);
 	return ret;
 }
 EXPORT_SYMBOL(generic_make_request);
-- 
2.16.4