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ab96bbab46
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John Ogness ab96bbab46 block: remove retry loop in ioc_release_fn() 
The reverse-order double lock dance in ioc_release_fn() is using a
retry loop. This is a problem on PREEMPT_RT because it could preempt
the task that would release q->queue_lock and thus live lock in the
retry loop.

RCU is already managing the freeing of the request queue and icq. If
the trylock fails, use RCU to guarantee that the request queue and
icq are not freed and re-acquire the locks in the correct order,
allowing forward progress.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-16 10:22:15 -06:00
..
partitions block: always remove partitions from blk_drop_partitions() 2020-07-15 09:23:42 -06:00
badblocks.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
bfq-cgroup.c block, bfq: invoke flush_idle_tree after reparent_active_queues in pd_offline 2020-03-21 14:31:03 -06:00
bfq-iosched.c blk-mq: remove the bio argument to ->prepare_request 2020-05-29 10:23:24 -06:00
bfq-iosched.h block, bfq: turn put_queue into release_process_ref in __bfq_bic_change_cgroup 2020-03-21 14:31:00 -06:00
bfq-wf2q.c block, bfq: get a ref to a group when adding it to a service tree 2020-02-03 06:58:15 -07:00
bio-integrity.c block/bio-integrity: don't free 'buf' if bio_integrity_add_page() failed 2020-06-02 17:21:50 -06:00
bio.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-cgroup-rwstat.c blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-cgroup-rwstat.h blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-cgroup.c writeback: remove struct bdi_writeback_congested 2020-07-08 17:05:53 -06:00
blk-core.c block: remove a bogus warning in __submit_bio_noacct_mq 2020-07-07 11:45:59 -06:00
blk-crypto-fallback.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-crypto-internal.h block: blk-crypto-fallback for Inline Encryption 2020-05-14 09:48:03 -06:00
blk-crypto.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-exec.c block: add a blk_account_io_merge_bio helper 2020-05-27 05:21:23 -06:00
blk-flush.c blk-mq: centralise related handling into blk_mq_get_driver_tag 2020-07-08 16:06:42 -06:00
blk-integrity.c block: Make blk-integrity preclude hardware inline encryption 2020-05-14 09:48:03 -06:00
blk-ioc.c block: remove retry loop in ioc_release_fn() 2020-07-16 10:22:15 -06:00
blk-iocost.c blk-iocost: Use struct_size() in kzalloc_node() 2020-06-24 09:15:58 -06:00
blk-iolatency.c blk-iolatency: only call ktime_get() if needed 2020-07-01 08:02:38 -06:00
blk-lib.c block: fix 32 bit overflow in __blkdev_issue_discard() 2018-11-14 08:17:18 -07:00
blk-map.c block: Inline encryption support for blk-mq 2020-05-14 09:47:53 -06:00
blk-merge.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-mq-cpumap.c blk-mq: balance mapping between present CPUs and queues 2019-08-04 21:43:12 -06:00
blk-mq-debugfs-zoned.c block: Cleanup license notice 2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c blk-mq: remove pointless call of list_entry_rq() in hctx_show_busy_rq() 2020-07-01 07:25:36 -06:00
blk-mq-debugfs.h blk-mq: no need to check return value of debugfs_create functions 2019-06-13 03:00:30 -06:00
blk-mq-pci.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-rdma.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-sched.c blk-mq: Remove unnecessary local variable 2020-07-10 07:58:09 -06:00
blk-mq-sched.h block: blk-mq: Remove blk_mq_sched_started_request and started_request 2019-07-23 07:25:09 -06:00
blk-mq-sysfs.c blk-mq: make sure that line break can be printed 2019-11-04 07:14:10 -07:00
blk-mq-tag.c blk-mq: move blk_mq_get_driver_tag into blk-mq.c 2020-06-30 12:57:59 -06:00
blk-mq-tag.h blk-mq: centralise related handling into blk_mq_get_driver_tag 2020-07-08 16:06:42 -06:00
blk-mq-virtio.c blk-mq: Fix typo in comment 2020-03-17 20:55:21 +01:00
blk-mq.c blk-mq: remove redundant validation in __blk_mq_end_request() 2020-07-10 07:58:33 -06:00
blk-mq.h Revert "blk-mq: put driver tag when this request is completed" 2020-07-01 22:58:32 -06:00
blk-pm.c block: bypass blk_set_runtime_active for uninitialized q->dev 2019-09-12 07:11:56 -06:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c Revert "blk-rq-qos: remove redundant finish_wait to rq_qos_wait." 2020-07-15 09:33:37 -06:00
blk-rq-qos.h blk-rq-qos: fix first node deletion of rq_qos_del() 2019-10-15 10:13:13 -06:00
blk-settings.c block: Introduce REQ_OP_ZONE_APPEND 2020-05-12 20:36:28 -06:00
blk-stat.c blk-stat: Optimise blk_stat_add() 2019-10-07 21:19:10 -06:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c block: create the request_queue debugfs_dir on registration 2020-06-24 09:15:58 -06:00
blk-throttle.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-timeout.c block: relax jiffies rounding for timeouts 2020-07-15 09:23:35 -06:00
blk-wbt.c blk-wbt: rename __wbt_update_limits to wbt_update_limits 2020-05-29 16:30:39 -06:00
blk-wbt.h blk-wbt: remove wbt_update_limits 2020-05-29 16:30:39 -06:00
blk-zoned.c block: Modify revalidate zones 2020-05-12 20:36:28 -06:00
blk.h blk-mq: centralise related handling into blk_mq_get_driver_tag 2020-07-08 16:06:42 -06:00
bounce.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
bsg-lib.c blk-mq: move failure injection out of blk_mq_complete_request 2020-06-24 09:15:57 -06:00
bsg.c compat_ioctl: bsg: add handler 2020-01-03 09:33:21 +01:00
cmdline-parser.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
elevator.c Merge branch 'for-linus' into for-5.5/block 2019-11-07 12:27:19 -07:00
genhd.c md: switch to ->check_events for media change notifications 2020-07-08 16:19:47 -06:00
ioctl.c block: Fix type of first compat_put_{,u}long() argument 2020-05-19 09:40:29 -06:00
ioprio.c docs: block: convert to ReST 2019-07-15 09:20:27 -03:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Kconfig.iosched treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
keyslot-manager.c block: Make blk-integrity preclude hardware inline encryption 2020-05-14 09:48:03 -06:00
kyber-iosched.c blk-mq: remove the bio argument to ->prepare_request 2020-05-29 10:23:24 -06:00
Makefile blk-mq: merge blk-softirq.c into blk-mq.c 2020-06-24 09:15:56 -06:00
mq-deadline.c blk-mq: remove the bio argument to ->prepare_request 2020-05-29 10:23:24 -06:00
opal_proto.h block: sed-opal: Change the check condition for regular session validity 2020-03-12 08:00:10 -06:00
scsi_ioctl.c scsi: core: Allow non-root users to perform ZBC commands 2020-03-16 18:26:31 -04:00
sed-opal.c block: sed-opal: Change the check condition for regular session validity 2020-03-12 08:00:10 -06:00
t10-pi.c block: Allow t10-pi to be modular 2020-01-06 20:59:04 -07:00