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Commit 4545a88f authored by Mike Christie's avatar Mike Christie Committed by James Bottomley
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[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: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 66bbe0ce

drivers/scsi/iscsi_tcp.c

+6 −8
Original line number Diff line number Diff line
@@ -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: