From cf377d886f7944a5ccdbd164b89949e13617b096 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Fri, 10 Oct 2014 10:51:52 -0700 Subject: [PATCH 1/3] net: bcmgenet: fix off-by-one in incrementing read pointer Commit b629be5c8399d7c423b92135eb43a86c924d1cbc ("net: bcmgenet: check harder for out of memory conditions") moved the increment of the local read pointer *before* reading from the hardware descriptor using dmadesc_get_length_status(), which creates an off-by-one situation. Fix this by moving again the read_ptr increment after we have read the hardware descriptor to get both the control block and the read pointer back in sync. Fixes: b629be5c8399 ("net: bcmgenet: check harder for out of memory conditions") Signed-off-by: Jaedon Shin Signed-off-by: Florian Fainelli Acked-by: Petri Gynther Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/genet/bcmgenet.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index fff2634b6f34..fdc9ec09e453 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -1285,11 +1285,6 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv, cb = &priv->rx_cbs[priv->rx_read_ptr]; skb = cb->skb; - rxpktprocessed++; - - priv->rx_read_ptr++; - priv->rx_read_ptr &= (priv->num_rx_bds - 1); - /* We do not have a backing SKB, so we do not have a * corresponding DMA mapping for this incoming packet since * bcmgenet_rx_refill always either has both skb and mapping or @@ -1404,6 +1399,10 @@ refill: err = bcmgenet_rx_refill(priv, cb); if (err) netif_err(priv, rx_err, dev, "Rx refill failed\n"); + + rxpktprocessed++; + priv->rx_read_ptr++; + priv->rx_read_ptr &= (priv->num_rx_bds - 1); } return rxpktprocessed; From 083731a8fbe71d83fc908adf137dc98ee352f280 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Fri, 10 Oct 2014 10:51:53 -0700 Subject: [PATCH 2/3] net: bcmgenet: avoid unbalanced enable_irq_wake calls Multiple enable_irq_wake() calls will keep increasing the IRQ wake_depth, which ultimately leads to the following types of situation: 1) enable Wake-on-LAN interrupt w/o password 2) enable Wake-on-LAN interrupt w/ password 3) enable Wake-on-LAN interrupt w/o password 4) disable Wake-on-LAN interrupt After step 4), GENET would always wake-up the system no matter what wake-up device we use, which is not what we want. Fix this by making sure there are no unbalanced enable_irq_wake() calls. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c index b82b7e4e06b2..149a0d70c108 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c @@ -86,7 +86,9 @@ int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol) /* Flag the device and relevant IRQ as wakeup capable */ if (wol->wolopts) { device_set_wakeup_enable(kdev, 1); - enable_irq_wake(priv->wol_irq); + /* Avoid unbalanced enable_irq_wake calls */ + if (priv->wol_irq_disabled) + enable_irq_wake(priv->wol_irq); priv->wol_irq_disabled = false; } else { device_set_wakeup_enable(kdev, 0); From 61b423a8a0bd9aeaa046f9a24bed42e3a953a936 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Fri, 10 Oct 2014 10:51:54 -0700 Subject: [PATCH 3/3] net: systemport: avoid unbalanced enable_irq_wake calls Multiple enable_irq_wake() calls will keep increasing the IRQ wake_depth, which ultimately leads to the following types of situation: 1) enable Wake-on-LAN interrupt w/o password 2) enable Wake-on-LAN interrupt w/ password 3) enable Wake-on-LAN interrupt w/o password 4) disable Wake-on-LAN interrupt After step 4), SYSTEMPORT would always wake-up the system no matter what wake-up device we use, which is not what we want. Fix this by making sure there are no unbalanced enable_irq_wake() calls. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcmsysport.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c index 075688188644..9ae36979bdee 100644 --- a/drivers/net/ethernet/broadcom/bcmsysport.c +++ b/drivers/net/ethernet/broadcom/bcmsysport.c @@ -436,7 +436,8 @@ static int bcm_sysport_set_wol(struct net_device *dev, /* Flag the device and relevant IRQ as wakeup capable */ if (wol->wolopts) { device_set_wakeup_enable(kdev, 1); - enable_irq_wake(priv->wol_irq); + if (priv->wol_irq_disabled) + enable_irq_wake(priv->wol_irq); priv->wol_irq_disabled = 0; } else { device_set_wakeup_enable(kdev, 0);