[SCSI] iscsi_tcp: don't fire conn error if pdu init fails

If a command's scsi cmd pdu setup fails then we can just fail
the IO to the scsi layer. If a DATA_OUT for a R2T fails then
we will want to drop the session, because it means we got a
bad request from the target (iscsi protocol error).

This patch has us propogate the error upwards so libiscsi_tcp
or libiscsi can decide what the best action is to take. It
also fixes a bug where we could try to grab the session lock
while holding it, because if iscsi_tcp drops the session in the
pdu setup callout the session lock is held when setting up the
scsi cmd pdu.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index b3e5e08e44ab..f97fc7e9de79 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -463,7 +463,7 @@ static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
         }
 
         if (err) {
-                iscsi_conn_failure(conn, err);
+                /* got invalid offset/len */
                 return -EIO;
         }
         return 0;
diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index 91f8ce4d8d08..b579ca9f4836 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -1036,8 +1036,11 @@ flush:
 
         rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
                                          r2t->data_count);
-        if (rc)
+        if (rc) {
+                iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED);
                 return rc;
+        }
+
         r2t->sent += r2t->data_count;
         goto flush;
 }