[PATCH 4.2 012/134] blk-mq: fix race between timeout and freeing request

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Ming Lei commit 0048b4837affd153897ed183492070027aa9 upstream. Inside timeout handler, blk_mq_tag_to_rq() is called to retrieve the request from one tag. This way is obviously wrong

[PATCH 4.2 012/134] blk-mq: fix race between timeout and freeing request

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Ming Lei commit 0048b4837affd153897ed183492070027aa9 upstream. Inside timeout handler, blk_mq_tag_to_rq() is called to retrieve the request from one tag. This way