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target: Make se_tmr_lock IRQ-safe 

transport_lookup_tmr_lun() can be called from interrupt context and
therefore needs to use IRQ-safe spinlock functions.  Fix this up, and
to make the locking work, convert the other uses of se_tmr_lock to be
IRQ-disabling.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2011-07-20 09:28:56 +00:00 committed by Nicholas Bellinger
parent 56e34ee2ad
commit 5e1be91982
2 changed files with 13 additions and 12 deletions
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9
drivers/target/target_core_device.c
View File

@ -181,6 +181,7 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
struct se_lun *se_lun = NULL;
struct se_session *se_sess = se_cmd->se_sess;
struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
unsigned long flags;
if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
@ -188,7 +189,7 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
return -ENODEV;
}
spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
deve = se_cmd->se_deve;
@ -200,7 +201,7 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
se_cmd->orig_fe_lun = unpacked_lun;
se_cmd->se_orig_obj_ptr = se_cmd->se_dev;
}
spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
if (!se_lun) {
printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
@ -223,9 +224,9 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
se_cmd->se_dev = se_lun->lun_se_dev;
se_tmr->tmr_dev = se_lun->lun_se_dev;
spin_lock(&se_tmr->tmr_dev->se_tmr_lock);
spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
spin_unlock(&se_tmr->tmr_dev->se_tmr_lock);
spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
return 0;
}

16
drivers/target/target_core_tmr.c
View File

@ -80,9 +80,9 @@ void core_tmr_release_req(
return;
}
spin_lock(&dev->se_tmr_lock);
spin_lock_irq(&dev->se_tmr_lock);
list_del(&tmr->tmr_list);
spin_unlock(&dev->se_tmr_lock);
spin_unlock_irq(&dev->se_tmr_lock);
kmem_cache_free(se_tmr_req_cache, tmr);
}
@ -154,7 +154,7 @@ int core_tmr_lun_reset(
* Release all pending and outgoing TMRs aside from the received
* LUN_RESET tmr..
*/
spin_lock(&dev->se_tmr_lock);
spin_lock_irq(&dev->se_tmr_lock);
list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
/*
* Allow the received TMR to return with FUNCTION_COMPLETE.
@ -176,17 +176,17 @@ int core_tmr_lun_reset(
(core_scsi3_check_cdb_abort_and_preempt(
preempt_and_abort_list, cmd) != 0))
continue;
spin_unlock(&dev->se_tmr_lock);
spin_unlock_irq(&dev->se_tmr_lock);
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (!(atomic_read(&cmd->t_transport_active))) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
spin_lock(&dev->se_tmr_lock);
spin_lock_irq(&dev->se_tmr_lock);
continue;
}
if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
spin_lock(&dev->se_tmr_lock);
spin_lock_irq(&dev->se_tmr_lock);
continue;
}
DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
@ -196,9 +196,9 @@ int core_tmr_lun_reset(
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_cmd_finish_abort_tmr(cmd);
spin_lock(&dev->se_tmr_lock);
spin_lock_irq(&dev->se_tmr_lock);
}
spin_unlock(&dev->se_tmr_lock);
spin_unlock_irq(&dev->se_tmr_lock);
/*
* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
* This is following sam4r17, section 5.6 Aborting commands, Table 38