From: Mike Christie <michaelc@xxxxxxxxxxx>
iscsi_tcp, ib_iser, cxgb*, be2iscsi and bnx2i do not use
the host lock and do not take the session lock against
a irq, so this patch drops the DEF_SCSI_QCMD use. Instead
we just take the session lock and disable bhs.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 37 ++++++++++++++-----------------------
include/scsi/libiscsi.h | 3 ++-
2 files changed, 16 insertions(+), 24 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 434d9ae..f460637 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -505,6 +505,7 @@ static void iscsi_free_task(struct iscsi_task *task)
struct iscsi_conn *conn = task->conn;
struct iscsi_session *session = conn->session;
struct scsi_cmnd *sc = task->sc;
+ int oldstate = task->state;
ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
task->itt, task->state, task->sc);
@@ -525,10 +526,10 @@ static void iscsi_free_task(struct iscsi_task *task)
/* SCSI eh reuses commands to verify us */
sc->SCp.ptr = NULL;
/*
- * queue command may call this to free the task, but
- * not have setup the sc callback
+ * queue command may call this to free the task, so
+ * it will decide how to return sc to scsi-ml.
*/
- if (sc->scsi_done)
+ if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
sc->scsi_done(sc);
}
}
@@ -571,7 +572,8 @@ static void iscsi_complete_task(struct iscsi_task *task, int state)
task->itt, task->state, task->sc);
if (task->state == ISCSI_TASK_COMPLETED ||
task->state == ISCSI_TASK_ABRT_TMF ||
- task->state == ISCSI_TASK_ABRT_SESS_RECOV)
+ task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
+ task->state == ISCSI_TASK_REQUEUE_SCSIQ)
return;
WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
task->state = state;
@@ -1599,27 +1601,23 @@ enum {
FAILURE_SESSION_NOT_READY,
};
-static int iscsi_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
+int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
{
struct iscsi_cls_session *cls_session;
- struct Scsi_Host *host;
struct iscsi_host *ihost;
int reason = 0;
struct iscsi_session *session;
struct iscsi_conn *conn;
struct iscsi_task *task = NULL;
- sc->scsi_done = done;
sc->result = 0;
sc->SCp.ptr = NULL;
- host = sc->device->host;
ihost = shost_priv(host);
- spin_unlock(host->host_lock);
cls_session = starget_to_session(scsi_target(sc->device));
session = cls_session->dd_data;
- spin_lock(&session->lock);
+ spin_lock_bh(&session->lock);
reason = iscsi_session_chkready(cls_session);
if (reason) {
@@ -1705,25 +1703,21 @@ static int iscsi_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi
}
session->queued_cmdsn++;
- spin_unlock(&session->lock);
- spin_lock(host->host_lock);
+ spin_unlock_bh(&session->lock);
return 0;
prepd_reject:
- sc->scsi_done = NULL;
- iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
+ iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
reject:
- spin_unlock(&session->lock);
+ spin_unlock_bh(&session->lock);
ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
sc->cmnd[0], reason);
- spin_lock(host->host_lock);
return SCSI_MLQUEUE_TARGET_BUSY;
prepd_fault:
- sc->scsi_done = NULL;
- iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
+ iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
fault:
- spin_unlock(&session->lock);
+ spin_unlock_bh(&session->lock);
ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
sc->cmnd[0], reason);
if (!scsi_bidi_cmnd(sc))
@@ -1732,12 +1726,9 @@ fault:
scsi_out(sc)->resid = scsi_out(sc)->length;
scsi_in(sc)->resid = scsi_in(sc)->length;
}
- done(sc);
- spin_lock(host->host_lock);
+ sc->scsi_done(sc);
return 0;
}
-
-DEF_SCSI_QCMD(iscsi_queuecommand)
EXPORT_SYMBOL_GPL(iscsi_queuecommand);
int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index b81d969..f1ff600 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -89,6 +89,7 @@ enum {
ISCSI_TASK_RUNNING,
ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
+ ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
};
struct iscsi_r2t_info {
@@ -341,7 +342,7 @@ extern int iscsi_eh_abort(struct scsi_cmnd *sc);
extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
-extern int iscsi_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *sc);
+extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
/*
* iSCSI host helpers.
--
1.7.0.1
--
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