From: Mike Christie <michaelc@xxxxxxxxxxx>
We increment session->cmdsn at the top of iscsi_prep_scsi_cmd_pdu, but
if the prep ecb or prep bidi or init_task calls fails then we leave the
session->cmdsn incremented. This moves the cmdsn manipulation to the end
of the function when we know it has succeeded.
It also adds a session->cmdsn--; in queuecommand for if a driver like
bnx2i tries to send a a task from that context but it fails. We do not
have to do this in the xmit thread context because that code will retry
the same task if the initial call fails.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 716cc34..3cef35b 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -301,8 +301,6 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
hdr->flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
memcpy(task->lun, hdr->lun, sizeof(task->lun));
- hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
- session->cmdsn++;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
cmd_len = sc->cmd_len;
if (cmd_len < ISCSI_CDB_SIZE)
@@ -388,6 +386,8 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
return -EIO;
task->state = ISCSI_TASK_RUNNING;
+ hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
+ session->cmdsn++;
conn->scsicmd_pdus_cnt++;
ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
@@ -1497,6 +1497,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
}
}
if (session->tt->xmit_task(task)) {
+ session->cmdsn--;
reason = FAILURE_SESSION_NOT_READY;
goto prepd_reject;
}
--
1.6.2.2
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
