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scsi: core: Revert "Make sure that targets outlive devices"
Revert the patch series "Call blk_mq_free_tag_set() earlier" because it
introduces a deadlock if the scsi_remove_host() caller holds a reference on
a device, target or host.
Link: https://lore.kernel.org/r/20220821220502.13685-5-bvanassche@acm.org
Fixes: fe44260419
("scsi: core: Make sure that targets outlive devices")
Reported-by: syzbot+bafeb834708b1bb750bc@syzkaller.appspotmail.com
Tested-by: Kenneth R. Crudup <kenny@panix.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
parent
d94b2d00f7
commit
f782201ebc
3 changed files with 3 additions and 21 deletions
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@ -521,8 +521,6 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
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starget->state = STARGET_CREATED;
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starget->scsi_level = SCSI_2;
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starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
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init_waitqueue_head(&starget->sdev_wq);
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retry:
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spin_lock_irqsave(shost->host_lock, flags);
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@ -443,9 +443,7 @@ static void scsi_device_cls_release(struct device *class_dev)
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static void scsi_device_dev_release_usercontext(struct work_struct *work)
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{
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struct scsi_device *sdev = container_of(work, struct scsi_device,
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ew.work);
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struct scsi_target *starget = sdev->sdev_target;
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struct scsi_device *sdev;
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struct device *parent;
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struct list_head *this, *tmp;
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struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
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@ -454,6 +452,8 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
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unsigned long flags;
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struct module *mod;
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sdev = container_of(work, struct scsi_device, ew.work);
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mod = sdev->host->hostt->module;
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scsi_dh_release_device(sdev);
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@ -516,9 +516,6 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
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kfree(sdev->inquiry);
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kfree(sdev);
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if (starget && atomic_dec_return(&starget->sdev_count) == 0)
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wake_up(&starget->sdev_wq);
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if (parent)
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put_device(parent);
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module_put(mod);
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@ -1538,14 +1535,6 @@ static void __scsi_remove_target(struct scsi_target *starget)
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goto restart;
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}
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spin_unlock_irqrestore(shost->host_lock, flags);
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/*
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* After scsi_remove_target() returns its caller can remove resources
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* associated with @starget, e.g. an rport or session. Wait until all
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* devices associated with @starget have been removed to prevent that
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* a SCSI error handling callback function triggers a use-after-free.
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*/
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wait_event(starget->sdev_wq, atomic_read(&starget->sdev_count) == 0);
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}
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/**
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@ -1656,9 +1645,6 @@ void scsi_sysfs_device_initialize(struct scsi_device *sdev)
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list_add_tail(&sdev->same_target_siblings, &starget->devices);
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list_add_tail(&sdev->siblings, &shost->__devices);
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spin_unlock_irqrestore(shost->host_lock, flags);
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atomic_inc(&starget->sdev_count);
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/*
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* device can now only be removed via __scsi_remove_device() so hold
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* the target. Target will be held in CREATED state until something
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@ -309,8 +309,6 @@ struct scsi_target {
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struct list_head devices;
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struct device dev;
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struct kref reap_ref; /* last put renders target invisible */
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atomic_t sdev_count;
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wait_queue_head_t sdev_wq;
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unsigned int channel;
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unsigned int id; /* target id ... replace
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* scsi_device.id eventually */
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