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authorThomas Klein <osstklei@de.ibm.com>2008-04-04 15:04:53 +0200
committerJeff Garzik <jgarzik@redhat.com>2008-04-12 04:47:50 -0400
commit44fb3126d7e6fb411775551b4653643f1d28ebe9 (patch)
treee7f8e112de20e501b5e73bbd38b530a77e954169 /drivers/net
parent5a81f14330ce70bc256b624593768fd1b4170d27 (diff)
downloadop-kernel-dev-44fb3126d7e6fb411775551b4653643f1d28ebe9.zip
op-kernel-dev-44fb3126d7e6fb411775551b4653643f1d28ebe9.tar.gz
ehea: Fix DLPAR memory add support
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 <tklein@de.ibm.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ehea/ehea.h3
-rw-r--r--drivers/net/ehea/ehea_main.c24
2 files changed, 24 insertions, 3 deletions
diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index 93b7fb2..a8d3280 100644
--- a/drivers/net/ehea/ehea.h
+++ b/drivers/net/ehea/ehea.h
@@ -40,7 +40,7 @@
#include <asm/io.h>
#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 --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 07c742d..f460b62 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -349,7 +349,8 @@ static void ehea_refill_rq1(struct ehea_port_res *pr, int index, int nr_of_wqes)
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 ehea_port *port, struct ehea_port_res *pr,
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_qp)
}
}
+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_struct *work)
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);
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