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scsi: target/core: Inline transport_lun_remove_cmd() 

Remove the code that clears .se_lun from transport_cmd_check_stop_to_fabric()
such that the transport_lun_remove_cmd() call can be moved into
target_release_cmd_kref(). Because this guarantees that
transport_lun_remove_cmd() will be called exactly once, it is safe to change
the cmpxchg() call into a test of se_cmd.lun_ref_active. Inline
transport_lun_remove_cmd() because it is not worth to keep it as a separate
function.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
hifive-unleashed-5.1
Bart Van Assche 2019-01-25 10:34:46 -08:00 committed by Martin K. Petersen
parent 2281c95fe7
commit 83f85b8ec3
1 changed files with 3 additions and 28 deletions
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31
drivers/target/target_core_transport.c
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@ -664,11 +664,6 @@ static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
target_remove_from_state_list(cmd);
/*
* Clear struct se_cmd->se_lun before the handoff to FE.
*/
cmd->se_lun = NULL;
spin_lock_irqsave(&cmd->t_state_lock, flags);
/*
* Determine if frontend context caller is requesting the stopping of
@ -696,17 +691,6 @@ static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
return cmd->se_tfo->check_stop_free(cmd);
}
static void transport_lun_remove_cmd(struct se_cmd *cmd)
{
struct se_lun *lun = cmd->se_lun;
if (!lun)
return;
if (cmpxchg(&cmd->lun_ref_active, true, false))
percpu_ref_put(&lun->lun_ref);
}
static void target_complete_failure_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
@ -797,8 +781,6 @@ static void target_handle_abort(struct se_cmd *cmd)
WARN_ON_ONCE(kref_read(&cmd->cmd_kref) == 0);
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
}
@ -1711,7 +1693,6 @@ static void target_complete_tmr_failure(struct work_struct *work)
se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
se_cmd->se_tfo->queue_tm_rsp(se_cmd);
transport_lun_remove_cmd(se_cmd);
transport_cmd_check_stop_to_fabric(se_cmd);
}
@ -1902,7 +1883,6 @@ void transport_generic_request_failure(struct se_cmd *cmd,
goto queue_full;
check_stop:
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
@ -2200,7 +2180,6 @@ queue_status:
transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
return;
}
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
}
@ -2295,7 +2274,6 @@ static void target_complete_ok_work(struct work_struct *work)
if (ret)
goto queue_full;
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
@ -2321,7 +2299,6 @@ static void target_complete_ok_work(struct work_struct *work)
if (ret)
goto queue_full;
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
@ -2357,7 +2334,6 @@ queue_rsp:
if (ret)
goto queue_full;
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
@ -2393,7 +2369,6 @@ queue_status:
break;
}
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
@ -2720,9 +2695,6 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
*/
if (cmd->state_active)
target_remove_from_state_list(cmd);
if (cmd->se_lun)
transport_lun_remove_cmd(cmd);
}
if (aborted)
cmd->free_compl = &compl;
@ -2794,6 +2766,9 @@ static void target_release_cmd_kref(struct kref *kref)
struct completion *abrt_compl = se_cmd->abrt_compl;
unsigned long flags;
if (se_cmd->lun_ref_active)
percpu_ref_put(&se_cmd->se_lun->lun_ref);
if (se_sess) {
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
list_del_init(&se_cmd->se_cmd_list);