[SCSI] iscsi_tcp: hold lock during data rsp processing

iscsi_data_rsp needs to hold the sesison lock when it calls
iscsi_update_cmdsn.

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

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 84c4a50..edebdf2 100644 (file)
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -641,13 +641,11 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
        }
 
        /* fill-in new R2T associated with the task */
-       spin_lock(&session->lock);
        iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
 
        if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) {
                printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
                       "recovery...\n", ctask->itt);
-               spin_unlock(&session->lock);
                return 0;
        }
 
@@ -660,7 +658,6 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
                printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
                __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
                            sizeof(void*));
-               spin_unlock(&session->lock);
                return ISCSI_ERR_DATALEN;
        }
 
@@ -676,7 +673,6 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
                       r2t->data_offset, scsi_bufflen(ctask->sc));
                __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
                            sizeof(void*));
-               spin_unlock(&session->lock);
                return ISCSI_ERR_DATALEN;
        }
 
@@ -690,8 +686,6 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
        conn->r2t_pdus_cnt++;
 
        iscsi_requeue_ctask(ctask);
-       spin_unlock(&session->lock);
-
        return 0;
 }
 
@@ -764,7 +758,9 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
        switch(opcode) {
        case ISCSI_OP_SCSI_DATA_IN:
                ctask = session->cmds[itt];
+               spin_lock(&conn->session->lock);
                rc = iscsi_data_rsp(conn, ctask);
+               spin_unlock(&conn->session->lock);
                if (rc)
                        return rc;
                if (tcp_conn->in.datalen) {
@@ -806,9 +802,11 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
                ctask = session->cmds[itt];
                if (ahslen)
                        rc = ISCSI_ERR_AHSLEN;
-               else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
+               else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
+                       spin_lock(&session->lock);
                        rc = iscsi_r2t_rsp(conn, ctask);
-               else
+                       spin_unlock(&session->lock);
+               } else
                        rc = ISCSI_ERR_PROTO;
                break;
        case ISCSI_OP_LOGIN_RSP: