From a91fb143de61dce847e319ca79b9937a665ad622 Mon Sep 17 00:00:00 2001 From: Jan-Bernd Themann Date: Tue, 15 Jun 2010 05:35:16 +0000 Subject: ehea: fix delayed packet processing In the eHEA poll function an rmb() is required. Without that some packets on the receive queue are not seen and thus delayed until the next interrupt is handled for the same receive queue. Signed-off-by: Jan-Bernd Themann Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller --- drivers/net/ehea/ehea_main.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/ehea') diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c index f547894..fd890fa 100644 --- a/drivers/net/ehea/ehea_main.c +++ b/drivers/net/ehea/ehea_main.c @@ -867,6 +867,7 @@ static int ehea_poll(struct napi_struct *napi, int budget) ehea_reset_cq_ep(pr->send_cq); ehea_reset_cq_n1(pr->recv_cq); ehea_reset_cq_n1(pr->send_cq); + rmb(); cqe = ehea_poll_rq1(pr->qp, &wqe_index); cqe_skb = ehea_poll_cq(pr->send_cq); -- cgit v1.1 From 099473c16bac7b936994bc95b5fd96f36397e1ad Mon Sep 17 00:00:00 2001 From: Jan-Bernd Themann Date: Tue, 15 Jun 2010 05:35:42 +0000 Subject: ehea: Fix kernel deadlock in DLPAR-mem processing Port reset operations and memory add/remove operations need to be serialized to avoid a kernel deadlock. The deadlock is caused by calling the napi_disable() function twice. Therefore we have to employ the dlpar_mem_lock in the ehea_reset_port function as well Signed-off-by: Jan-Bernd Themann Signed-off-by: David S. Miller --- drivers/net/ehea/ehea.h | 2 +- drivers/net/ehea/ehea_main.c | 8 +++----- 2 files changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/net/ehea') diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h index 0630980..0060e42 100644 --- a/drivers/net/ehea/ehea.h +++ b/drivers/net/ehea/ehea.h @@ -40,7 +40,7 @@ #include #define DRV_NAME "ehea" -#define DRV_VERSION "EHEA_0103" +#define DRV_VERSION "EHEA_0105" /* eHEA capability flags */ #define DLPAR_PORT_ADD_REM 1 diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c index fd890fa..8b92acb 100644 --- a/drivers/net/ehea/ehea_main.c +++ b/drivers/net/ehea/ehea_main.c @@ -2860,6 +2860,7 @@ static void ehea_reset_port(struct work_struct *work) container_of(work, struct ehea_port, reset_task); struct net_device *dev = port->netdev; + mutex_lock(&dlpar_mem_lock); port->resets++; mutex_lock(&port->port_lock); netif_stop_queue(dev); @@ -2882,6 +2883,7 @@ static void ehea_reset_port(struct work_struct *work) netif_wake_queue(dev); out: mutex_unlock(&port->port_lock); + mutex_unlock(&dlpar_mem_lock); } static void ehea_rereg_mrs(struct work_struct *work) @@ -3543,10 +3545,7 @@ static int ehea_mem_notifier(struct notifier_block *nb, int ret = NOTIFY_BAD; struct memory_notify *arg = data; - if (!mutex_trylock(&dlpar_mem_lock)) { - ehea_info("ehea_mem_notifier must not be called parallelized"); - goto out; - } + mutex_lock(&dlpar_mem_lock); switch (action) { case MEM_CANCEL_OFFLINE: @@ -3575,7 +3574,6 @@ static int ehea_mem_notifier(struct notifier_block *nb, out_unlock: mutex_unlock(&dlpar_mem_lock); -out: return ret; } -- cgit v1.1