From: Bart Van Assche <bvanassche@acm.org>
To: linux-scsi <linux-scsi@vger.kernel.org>,
James Bottomley <jbottomley@parallels.com>,
Mike Christie <michaelc@cs.wisc.edu>,
Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Chanho Min <chanho.min@lge.com>, Hannes Reinecke <hare@suse.de>
Subject: [PATCH 0/13 v6] More device removal fixes
Date: Wed, 28 Nov 2012 13:39:53 +0100 [thread overview]
Message-ID: <50B60619.4080406@acm.org> (raw)
Fix a few race conditions that can be triggered by removing a device:
- Avoid that request_fn() can be invoked on a dead queue.
- Avoid that blk_cleanup_queue() can finish while request_fn is still
running.
- Fix a race between starved list processing and device removal.
- Avoid that a SCSI LLD callback can be invoked after scsi_remove_host()
finished.
- Speed up device removal by stopping error handling as soon as
scsi_remove_host() started.
These patches have been tested on top of kernel v3.7-rc7.
Changes compared to v5:
- Avoid that block layer work can be scheduled on a dead queue.
- Do not invoke any SCSI LLD callback after scsi_remove_host() finished.
- Stop error handling as soon as scsi_remove_host() started.
- Remove the unused function bsg_goose_queue().
- Avoid that scsi_device_set_state() triggers a race condition.
Changes compared to v4:
- Moved queue_flag_set(QUEUE_FLAG_DEAD, q) from blk_drain_queue() into
blk_cleanup_queue().
- Declared the new __blk_run_queue_uncond() function inline. Checked in
the generated assembler code that this function is really inlined in
__blk_run_queue().
- Elaborated several patch descriptions.
- Added sparse annotations to scsi_request_fn().
- Split several patches.
Changes compared to v3:
- Fixed a race condition by setting QUEUE_FLAG_DEAD earlier.
- Added a patch for fixing a race between starved list processing
and device removal to this series.
Changes compared to v2:
- Split second patch into two patches.
- Refined patch descriptions.
Changes compared to v1:
- Included a patch to rename QUEUE_FLAG_DEAD.
- Refined the descriptions of the __blk_run_queue_uncond() and
blk_cleanup_queue() functions.
next reply other threads:[~2012-11-28 12:39 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-28 12:39 Bart Van Assche [this message]
2012-11-28 12:42 ` [PATCH v6 01/13] block: Rename queue dead flag Bart Van Assche
2012-11-28 12:43 ` [PATCH v6 02/13] block: Let blk_drain_queue() caller obtain the queue lock Bart Van Assche
2012-11-28 12:44 ` [PATCH v6 03/13] block: Avoid that request_fn is invoked on a dead queue Bart Van Assche
2012-12-02 13:23 ` Tejun Heo
2012-12-02 13:35 ` Bart Van Assche
2012-11-28 12:45 ` [PATCH v6 04/13] block: Avoid scheduling delayed work " Bart Van Assche
2012-12-02 13:26 ` Tejun Heo
2012-12-02 13:41 ` Bart Van Assche
2012-12-02 13:59 ` Tejun Heo
2012-11-28 12:46 ` [PATCH v6 05/13] block: Make blk_cleanup_queue() wait until request_fn finished Bart Van Assche
2012-12-02 13:28 ` Tejun Heo
2012-11-28 12:47 ` [PATCH v6 06/13] bsg: Remove unused function bsg_goose_queue() Bart Van Assche
2012-12-02 13:29 ` Tejun Heo
2012-11-28 12:48 ` [PATCH v6 07/13] Fix race between starved list processing and device removal Bart Van Assche
2012-12-02 13:32 ` Tejun Heo
2012-11-28 12:48 ` [PATCH v6 08/13] Remove get_device() / put_device() pair from scsi_request_fn() Bart Van Assche
2012-12-02 13:34 ` Tejun Heo
2012-11-28 12:50 ` [PATCH v6 09/13] Avoid saving/restoring interrupt state inside scsi_remove_host() Bart Van Assche
2012-12-02 13:35 ` Tejun Heo
2012-11-28 12:51 ` [PATCH v6 10/13] Make scsi_remove_host() wait for device removal Bart Van Assche
2012-12-02 13:45 ` Tejun Heo
2012-12-02 13:48 ` Tejun Heo
2012-12-03 8:23 ` Bart Van Assche
2012-12-03 16:15 ` Tejun Heo
2012-12-03 16:38 ` Bart Van Assche
2012-12-03 16:42 ` Tejun Heo
2012-12-07 7:41 ` Bart Van Assche
2012-11-28 12:52 ` [PATCH v6 11/13] Make scsi_remove_host() wait until error handling finished Bart Van Assche
2012-12-02 13:51 ` Tejun Heo
2012-11-28 12:53 ` [PATCH v6 12/13] Avoid that scsi_device_set_state() triggers a race Bart Van Assche
2012-12-02 13:53 ` Tejun Heo
2012-11-28 12:53 ` [PATCH v6 13/13] Do not queue new I/O after scsi_remove_host() started Bart Van Assche
2012-12-02 13:58 ` Tejun Heo
2012-12-02 14:02 ` [PATCH 0/13 v6] More device removal fixes Tejun Heo
2012-12-06 13:33 ` Jens Axboe
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