Hi Jens, This patch series fixes the race between iterating over requests and freeing requests that has been reported by multiple different users over the past two years. Please consider this patch series for kernel v5.13. Thank you, Bart. Changes compared to v2: - Converted the single v2 patch into a series of three patches. - Switched from SRCU to a combination of RCU and semaphores. Changes compared to v1: - Reformatted patch description. - Added Tested-by/Reviewed-by tags. - Changed srcu_barrier() calls into synchronize_srcu() calls. Bart Van Assche (3): blk-mq: Move the elevator_exit() definition blk-mq: Introduce atomic variants of the tag iteration functions blk-mq: Fix races between iterating over requests and freeing requests block/blk-core.c | 34 ++++++++++++++- block/blk-mq-tag.c | 87 ++++++++++++++++++++++++++++++++++----- block/blk-mq-tag.h | 8 ++-- block/blk-mq.c | 31 ++++++++++---- block/blk-mq.h | 1 + block/blk.h | 11 +---- block/elevator.c | 9 ++++ drivers/scsi/hosts.c | 16 +++---- drivers/scsi/ufs/ufshcd.c | 4 +- include/linux/blk-mq.h | 2 + 10 files changed, 160 insertions(+), 43 deletions(-)
