Mike Snitzer aa6df8dd28 dm: fix free_rq_clone() NULL pointer when requeueing unmapped request ... Commit 022333427a ("dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq") mistakenly removed free_rq_clone()'s clone->q check before testing clone->q->mq_ops. It was an oversight to discontinue that check for 1 of the 2 use-cases for free_rq_clone(): 1) free_rq_clone() called when an unmapped original request is requeued 2) free_rq_clone() called in the request-based IO completion path The clone->q check made sense for case #1 but not for #2. However, we cannot just reinstate the check as it'd mask a serious bug in the IO completion case #2 -- no in-flight request should have an uninitialized request_queue (basic block layer refcounting _should_ ensure this). The NULL pointer seen for case #1 is detailed here: https://www.redhat.com/archives/dm-devel/2015-April/msg00160.html Fix this free_rq_clone() NULL pointer by simply checking if the mapped_device's type is DM_TYPE_MQ_REQUEST_BASED (clone's queue is blk-mq) rather than checking clone->q->mq_ops. This avoids the need to dereference clone->q, but a WARN_ON_ONCE is added to let us know if an uninitialized clone request is being completed. Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>		2015-04-30 10:25:21 -04:00
..
bcache	md/bcache: use generic io stats accounting functions to simplify io stat accounting	2014-11-24 08:05:12 -07:00
persistent-data	- Significant dm-crypt CPU scalability performance improvements thanks	2015-02-21 13:28:45 -08:00
bitmap.c	md-cluster: re-add capabilities	2015-04-22 07:59:39 +10:00
bitmap.h	md-cluster: re-add capabilities	2015-04-22 07:59:39 +10:00
dm-bio-prison.c	dm bio prison: introduce support for locking ranges of blocks	2014-11-10 15:25:30 -05:00
dm-bio-prison.h	dm bio prison: introduce support for locking ranges of blocks	2014-11-10 15:25:30 -05:00
dm-bio-record.h	dm: Refactor for new bio cloning/splitting	2013-11-23 22:33:55 -08:00
dm-bufio.c	dm bufio: fix time comparison to use time_after_eq()	2015-02-09 13:06:48 -05:00
dm-bufio.h	dm snapshot: use dm-bufio prefetch	2014-01-14 23:23:03 -05:00
dm-builtin.c	dm sysfs: fix a module unload race	2014-01-14 23:23:04 -05:00
dm-cache-block-types.h	dm cache: revert "remove remainder of distinct discard block size"	2014-11-10 15:25:30 -05:00
dm-cache-metadata.c	dm cache: fix missing ERR_PTR returns and handling	2015-01-28 09:59:20 -05:00
dm-cache-metadata.h	dm cache: revert "remove remainder of distinct discard block size"	2014-11-10 15:25:30 -05:00
dm-cache-policy-cleaner.c	dm cache: policy change version from string to integer set	2013-03-20 17:21:27 +00:00
dm-cache-policy-internal.h	dm cache: add remove_cblock method to policy interface	2013-11-11 11:37:50 -05:00
dm-cache-policy-mq.c	dm cache policy mq: try not to writeback data that changed in the last second	2015-03-31 12:03:48 -04:00
dm-cache-policy.c	dm cache: add policy name to status output	2014-01-16 13:44:11 -05:00
dm-cache-policy.h	dm cache: add policy name to status output	2014-01-16 13:44:11 -05:00
dm-cache-target.c	- Most significant change this cycle is request-based DM now supports	2015-02-12 16:36:31 -08:00
dm-crypt.c	dm crypt: fix missing error code return from crypt_ctr error path	2015-04-16 22:00:50 -04:00
dm-delay.c	dm delay: use msecs_to_jiffies for time conversion	2015-04-15 12:10:21 -04:00
dm-era-target.c	dm era: check for a non-NULL metadata object before closing it	2014-06-03 13:44:08 -04:00
dm-exception-store.c	dm: replace simple_strtoul	2012-07-27 15:07:59 +01:00
dm-exception-store.h
dm-flakey.c	block: Abstract out bvec iterator	2013-11-23 22:33:47 -08:00
dm-io.c	dm io: deal with wandering queue limits when handling REQ_DISCARD and REQ_WRITE_SAME	2015-02-27 14:53:32 -05:00
dm-ioctl.c	dm: only initialize the request_queue once	2015-04-30 10:25:21 -04:00
dm-kcopyd.c	dm: stop using WQ_NON_REENTRANT	2013-08-23 09:02:13 -04:00
dm-linear.c	block: Abstract out bvec iterator	2013-11-23 22:33:47 -08:00
dm-log-userspace-base.c	dm log userspace base: fix compile warning	2015-04-15 12:10:20 -04:00
dm-log-userspace-transfer.c	dm log userspace transfer: match wait_for_completion_timeout return type	2015-04-15 12:10:20 -04:00
dm-log-userspace-transfer.h
dm-log-writes.c	dm: add log writes target	2015-04-15 12:10:24 -04:00
dm-log.c	dm: use memweight()	2012-07-30 17:25:16 -07:00
dm-mpath.c	dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq	2015-04-15 12:10:17 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-raid1.c	dm mirror: do not degrade the mirror on discard error	2015-02-13 19:50:46 -05:00
dm-raid.c	- Most significant change this cycle is request-based DM now supports	2015-02-12 16:36:31 -08:00
dm-region-hash.c	block: Abstract out bvec iterator	2013-11-23 22:33:47 -08:00
dm-round-robin.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-service-time.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-snap-persistent.c	dm snapshot: remove unnecessary NULL checks before vfree() calls	2015-02-09 13:06:49 -05:00
dm-snap-transient.c
dm-snap.c	dm snapshot: suspend merging snapshot when doing exception handover	2015-02-27 14:53:16 -05:00
dm-stats.c	- Significant DM thin-provisioning performance improvements to meet	2014-12-08 21:10:03 -08:00
dm-stats.h	dm: add statistics support	2013-09-05 20:46:06 -04:00
dm-stripe.c	dm stripe: fix potential for leak in stripe_ctr error path	2014-10-10 22:05:18 -04:00
dm-switch.c	dm switch: efficiently support repetitive patterns	2014-08-01 12:30:37 -04:00
dm-sysfs.c	dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr	2015-04-15 12:10:17 -04:00
dm-table.c	dm table: use bool function return values of true/false not 1/0	2015-04-15 12:10:23 -04:00
dm-target.c	dm: allocate requests in target when stacking on blk-mq devices	2015-02-09 13:06:47 -05:00
dm-thin-metadata.c	dm thin metadata: remove unused dm_pool_get_data_block_size()	2015-02-09 13:06:49 -05:00
dm-thin-metadata.h	dm thin metadata: remove unused dm_pool_get_data_block_size()	2015-02-09 13:06:49 -05:00
dm-thin.c	dm thin: fix to consistently zero-fill reads to unprovisioned blocks	2015-02-27 09:59:12 -05:00
dm-uevent.c
dm-uevent.h
dm-verity.c	dm verity: add error handling modes for corrupted blocks	2015-04-15 12:10:22 -04:00
dm-zero.c	dm crypt, dm zero: update author name following legal name change	2014-07-10 16:44:14 -04:00
dm.c	dm: fix free_rq_clone() NULL pointer when requeueing unmapped request	2015-04-30 10:25:21 -04:00
dm.h	dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr	2015-04-15 12:10:17 -04:00
faulty.c	md: rename ->stop to ->free	2015-02-04 08:35:52 +11:00
Kconfig	md updates for 4.1	2015-04-24 09:28:01 -07:00
linear.c	md: rename ->stop to ->free	2015-02-04 08:35:52 +11:00
linear.h
Makefile	md updates for 4.1	2015-04-24 09:28:01 -07:00
md-cluster.c	md-cluster: re-add capabilities	2015-04-22 07:59:39 +10:00
md-cluster.h	md-cluster: re-add capabilities	2015-04-22 07:59:39 +10:00
md.c	md: allow resync to go faster when there is competing IO.	2015-04-22 08:00:40 +10:00
md.h	md: remove 'go_faster' option from ->sync_request()	2015-04-22 08:00:40 +10:00
multipath.c	md: rename ->stop to ->free	2015-02-04 08:35:52 +11:00
multipath.h
raid0.c	md raid0: access mddev->queue (request queue member) conditionally because it is not set when accessed from dm-raid	2015-04-22 08:00:41 +10:00
raid0.h	md: add proper merge_bvec handling to RAID0 and Linear.	2012-03-19 12:46:39 +11:00
raid1.c	md: remove 'go_faster' option from ->sync_request()	2015-04-22 08:00:40 +10:00
raid1.h	md: make ->congested robust against personality changes.	2015-02-04 08:35:52 +11:00
raid5.c	md/raid5: don't do chunk aligned read on degraded array.	2015-04-22 08:00:43 +10:00
raid5.h	md/raid5: allow the stripe_cache to grow and shrink.	2015-04-22 08:00:43 +10:00
raid10.c	md: remove 'go_faster' option from ->sync_request()	2015-04-22 08:00:40 +10:00
raid10.h	md: make ->congested robust against personality changes.	2015-02-04 08:35:52 +11:00