Hello Jens, It is known that during the resume following a hibernate sometimes the system hangs instead of coming up properly. This patch series fixes this problem. This patch series is an alternative for Ming Lei's "[PATCH V5 0/10] block/scsi: safe SCSI quiescing" patch series. The advantages of this patch series are: - Easier to review because no new race conditions are introduced between queue freezing and blk_cleanup_queue(). As the discussion that followed Ming's patch series shows the correctness of the new code is hard to verify. - No new freeze modes and hence no new freeze mode variables.
These patches have been tested on top of a merge of the block layer for-next branch and Linus' master tree. Linus' master tree includes patch "KVM: x86: Fix the NULL pointer parameter in check_cr_write()" but the block layer for-next branch not yet. Please consider these changes for kernel v4.15. Thanks, Bart. Changes between v2 and v3: - Made md kernel threads freezable. - Changed the approach for quiescing SCSI devices again. - Addressed Ming's review comments. Changes compared to v1 of this patch series: - Changed the approach and rewrote the patch series. Bart Van Assche (6): md: Make md resync and reshape threads freezable block: Convert RQF_PREEMPT into REQ_PREEMPT block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag scsi: Set QUEUE_FLAG_PREEMPT_ONLY while quiesced block: Make SCSI device suspend and resume work reliably scsi-mq: Reduce suspend latency block/blk-core.c | 46 +++++++++++++++++++++++++++++++++++++++------- block/blk-mq-debugfs.c | 2 +- block/blk-mq.c | 4 ++-- block/blk-timeout.c | 2 +- drivers/ide/ide-atapi.c | 3 +-- drivers/ide/ide-io.c | 2 +- drivers/ide/ide-pm.c | 4 ++-- drivers/md/md.c | 21 +++++++++++++-------- drivers/scsi/scsi_lib.c | 36 ++++++++++++++++++++++++++---------- fs/block_dev.c | 4 ++-- include/linux/blk_types.h | 6 ++++++ include/linux/blkdev.h | 10 ++++++---- 12 files changed, 100 insertions(+), 40 deletions(-) -- 2.14.1
