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6e1fcab00a
John Garry reported a deadlock that occurs when trying to access a
runtime-suspended SATA device. For obscure reasons, the rescan procedure
causes the link to be hard-reset, which disconnects the device.
The rescan tries to carry out a runtime resume when accessing the device.
scsi_rescan_device() holds the SCSI device lock and won't release it until
it can put commands onto the device's block queue. This can't happen until
the queue is successfully runtime-resumed or the device is unregistered.
But the runtime resume fails because the device is disconnected, and
__scsi_remove_device() can't do the unregistration because it can't get the
device lock.
The best way to resolve this deadlock appears to be to allow the block
queue to start running again even after an unsuccessful runtime resume.
The idea is that the driver or the SCSI error handler will need to be able
to use the queue to resolve the runtime resume failure.
This patch removes the err argument to blk_post_runtime_resume() and makes
the routine act as though the resume was successful always. This fixes the
deadlock.
Link: https://lore.kernel.org/r/1639999298-244569-4-git-send-email-chenxiang66@hisilicon.com
Fixes: e27829dc92 ("scsi: serialize ->rescan against ->remove")
Reported-and-tested-by: John Garry <john.garry@huawei.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
24 lines
708 B
C
24 lines
708 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BLK_PM_H_
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#define _BLK_PM_H_
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struct device;
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struct request_queue;
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/*
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* block layer runtime pm functions
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*/
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#ifdef CONFIG_PM
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extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
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extern int blk_pre_runtime_suspend(struct request_queue *q);
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extern void blk_post_runtime_suspend(struct request_queue *q, int err);
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extern void blk_pre_runtime_resume(struct request_queue *q);
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extern void blk_post_runtime_resume(struct request_queue *q);
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extern void blk_set_runtime_active(struct request_queue *q);
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#else
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static inline void blk_pm_runtime_init(struct request_queue *q,
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struct device *dev) {}
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#endif
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#endif /* _BLK_PM_H_ */
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