From 87ee7b112193bd081ba1a171fa5f6f39c429ef56 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 24 Apr 2014 08:51:47 -0600 Subject: [PATCH] blk-mq: fix race with timeouts and requeue events If a requeue event races with a timeout, we can get into the situation where we attempt to complete a request from the timeout handler when it's not start anymore. This causes a crash. So have the timeout handler check that REQ_ATOM_STARTED is still set on the request - if not, we ignore the event. If this happens, the request has now been marked as complete. As a consequence, we need to ensure to clear REQ_ATOM_COMPLETE in blk_mq_start_request(), as to maintain proper request state. Signed-off-by: Jens Axboe --- Reading git-format-patch failed