From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762886AbYDDNMi (ORCPT ); Fri, 4 Apr 2008 09:12:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932188AbYDDNE7 (ORCPT ); Fri, 4 Apr 2008 09:04:59 -0400 Received: from mtagate4.uk.ibm.com ([195.212.29.137]:51474 "EHLO mtagate4.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932174AbYDDNE5 (ORCPT ); Fri, 4 Apr 2008 09:04:57 -0400 From: Thomas Klein To: Jeff Garzik Subject: [PATCH] ehea: Fix DLPAR memory add support Date: Fri, 4 Apr 2008 15:04:53 +0200 User-Agent: KMail/1.9.6 (enterprise 20070904.708012) Cc: Christoph Raisch , "Jan-Bernd Themann" , "linux-kernel" , "linux-ppc" , netdev , Stefan Roscher , Hannes Hering MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200804041504.54130.osstklei@de.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch fixes two weaknesses in send/receive packet handling which may lead to kernel panics during DLPAR memory add operations. Signed-off-by: Thomas Klein --- diff -Nurp -X dontdiff linux-2.6.25-rc8/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h --- linux-2.6.25-rc8/drivers/net/ehea/ehea.h 2008-04-01 21:44:26.000000000 +0200 +++ patched_kernel/drivers/net/ehea/ehea.h 2008-04-03 15:36:36.000000000 +0200 @@ -40,7 +40,7 @@ #include #define DRV_NAME "ehea" -#define DRV_VERSION "EHEA_0089" +#define DRV_VERSION "EHEA_0090" /* eHEA capability flags */ #define DLPAR_PORT_ADD_REM 1 @@ -371,6 +371,7 @@ struct ehea_port_res { struct ehea_q_skb_arr rq2_skba; struct ehea_q_skb_arr rq3_skba; struct ehea_q_skb_arr sq_skba; + int sq_skba_size; spinlock_t netif_queue; int queue_stopped; int swqe_refill_th; diff -Nurp -X dontdiff linux-2.6.25-rc8/drivers/net/ehea/ehea_main.c patched_kernel/drivers/net/ehea/ehea_main.c --- linux-2.6.25-rc8/drivers/net/ehea/ehea_main.c 2008-04-01 21:44:26.000000000 +0200 +++ patched_kernel/drivers/net/ehea/ehea_main.c 2008-04-03 15:36:36.000000000 +0200 @@ -349,7 +349,8 @@ static void ehea_refill_rq1(struct ehea_ pr->rq1_skba.os_skbs = 0; if (unlikely(test_bit(__EHEA_STOP_XFER, &ehea_driver_flags))) { - pr->rq1_skba.index = index; + if (nr_of_wqes > 0) + pr->rq1_skba.index = index; pr->rq1_skba.os_skbs = fill_wqes; return; } @@ -1464,7 +1465,9 @@ static int ehea_init_port_res(struct ehe init_attr->act_nr_rwqes_rq2, init_attr->act_nr_rwqes_rq3); - ret = ehea_init_q_skba(&pr->sq_skba, init_attr->act_nr_send_wqes + 1); + pr->sq_skba_size = init_attr->act_nr_send_wqes + 1; + + ret = ehea_init_q_skba(&pr->sq_skba, pr->sq_skba_size); ret |= ehea_init_q_skba(&pr->rq1_skba, init_attr->act_nr_rwqes_rq1 + 1); ret |= ehea_init_q_skba(&pr->rq2_skba, init_attr->act_nr_rwqes_rq2 + 1); ret |= ehea_init_q_skba(&pr->rq3_skba, init_attr->act_nr_rwqes_rq3 + 1); @@ -2621,6 +2624,22 @@ void ehea_purge_sq(struct ehea_qp *orig_ } } +void ehea_flush_sq(struct ehea_port *port) +{ + int i; + + for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++) { + struct ehea_port_res *pr = &port->port_res[i]; + int swqe_max = pr->sq_skba_size - 2 - pr->swqe_ll_count; + int k = 0; + while (atomic_read(&pr->swqe_avail) < swqe_max) { + msleep(5); + if (++k == 20) + break; + } + } +} + int ehea_stop_qps(struct net_device *dev) { struct ehea_port *port = netdev_priv(dev); @@ -2845,6 +2864,7 @@ static void ehea_rereg_mrs(struct work_s if (dev->flags & IFF_UP) { down(&port->port_lock); netif_stop_queue(dev); + ehea_flush_sq(port); ret = ehea_stop_qps(dev); if (ret) { up(&port->port_lock);