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authorMike Christie <michaelc@cs.wisc.edu>2010-12-31 11:22:21 +0300
committerJames Bottomley <James.Bottomley@suse.de>2010-12-31 18:52:44 +0300
commitf41d472179a0d7c8e8160c85180ab1124947068e (patch)
tree51f3397de8fc8acf3c27d08c2e39e2eb39bacc75 /drivers/scsi/libiscsi.c
parent1227633a441363642cdbaf38c4241d071e917095 (diff)
downloadlinux-f41d472179a0d7c8e8160c85180ab1124947068e.tar.xz
[SCSI] libiscsi: do not take host lock in queuecommand
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@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r--drivers/scsi/libiscsi.c37
1 files changed, 14 insertions, 23 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 3eddab0774e4..1def8e101249 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);
}
}
@@ -572,7 +573,8 @@ 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;
@@ -1600,27 +1602,23 @@ 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) {
@@ -1706,25 +1704,21 @@ 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))
@@ -1733,12 +1727,9 @@ 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)