[PATCH 1/3] e1000: FIX: be ready for incoming irq at pci_request_irq

Auke Kok
2007-03-06T16:57:32Z

From: Auke Kok <auke-jan.h.kok@intel.com>

DEBUG_SHIRQ code exposed that e1000 was not ready for incoming interrupts
after having called pci_request_irq. This obviously requires us to finish
our software setup which assigns the irq handler before we request the
irq.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
---

drivers/net/e1000/e1000_main.c | 66 +++++++++++++++++++++++++++-------------
1 files changed, 45 insertions(+), 21 deletions(-)

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 98215fd..fff3bc0 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -522,14 +522,15 @@ e1000_release_manageability(struct e1000_adapter *adapter)
}
}

-int
-e1000_up(struct e1000_adapter *adapter)
+/**
+ * e1000_configure - configure the hardware for RX and TX
+ * @adapter = private board structure
+ **/
+static void e1000_configure(struct e1000_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int i;

- /* hardware has been reset, we need to reload some things */
-
e1000_set_multi(netdev);

e1000_restore_vlan(adapter);
@@ -548,14 +549,20 @@ e1000_up(struct e1000_adapter *adapter)
}

adapter->tx_queue_len = netdev->tx_queue_len;
+}
+
+int e1000_up(struct e1000_adapter *adapter)
+{
+ /* hardware has been reset, we need to reload some things */
+ e1000_configure(adapter);
+
+ clear_bit(__E1000_DOWN, &adapter->flags);

#ifdef CONFIG_E1000_NAPI
- netif_poll_enable(netdev);
+ netif_poll_enable(adapter->netdev);
#endif
e1000_irq_enable(adapter);

- clear_bit(__E1000_DOWN, &adapter->flags);
-
/* fire a link change interrupt to start the watchdog */
E1000_WRITE_REG(&adapter->hw, ICS, E1000_ICS_LSC);
return 0;
@@ -640,15 +647,15 @@ e1000_down(struct e1000_adapter *adapter)
* reschedule our watchdog timer */
set_bit(__E1000_DOWN, &adapter->flags);

+#ifdef CONFIG_E1000_NAPI
+ netif_poll_disable(netdev);
+#endif
e1000_irq_disable(adapter);

del_timer_sync(&adapter->tx_fifo_stall_timer);
del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);

-#ifdef CONFIG_E1000_NAPI
- netif_poll_disable(netdev);
-#endif
netdev->tx_queue_len = adapter->tx_queue_len;
adapter->link_speed = 0;
adapter->link_duplex = 0;
@@ -1410,21 +1417,17 @@ e1000_open(struct net_device *netdev)
return -EBUSY;

/* allocate transmit descriptors */
- if ((err = e1000_setup_all_tx_resources(adapter)))
+ err = e1000_setup_all_tx_resources(adapter);
+ if (err)
goto err_setup_tx;

/* allocate receive descriptors */
- if ((err = e1000_setup_all_rx_resources(adapter)))
- goto err_setup_rx;
-
- err = e1000_request_irq(adapter);
+ err = e1000_setup_all_rx_resources(adapter);
if (err)
- goto err_req_irq;
+ goto err_setup_rx;

e1000_power_up_phy(adapter);

- if ((err = e1000_up(adapter)))
- goto err_up;
adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
if ((adapter->hw.mng_cookie.status &
E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
@@ -1437,12 +1440,33 @@ e1000_open(struct net_device *netdev)
e1000_check_mng_mode(&adapter->hw))
e1000_get_hw_control(adapter);

+ /* before we allocate an interrupt, we must be ready to handle it.
+ * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
+ * as soon as we call pci_request_irq, so we have to setup our
+ * clean_rx handler before we do so. */
+ e1000_configure(adapter);
+
+ err = e1000_request_irq(adapter);
+ if (err)
+ goto err_req_irq;
+
+ /* From here on the code is the same as e1000_up() */
+ clear_bit(__E1000_DOWN, &adapter->flags);
+
+#ifdef CONFIG_E1000_NAPI
+ netif_poll_enable(netdev);
+#endif
+
+ e1000_irq_enable(adapter);
+
+ /* fire a link status change interrupt to start the watchdog */
+ E1000_WRITE_REG(&adapter->hw, ICS, E1000_ICS_LSC);
+
return E1000_SUCCESS;

-err_up:
- e1000_power_down_phy(adapter);
- e1000_free_irq(adapter);
err_req_irq:
+ e1000_release_hw_control(adapter);
+ e1000_power_down_phy(adapter);
e1000_free_all_rx_resources(adapter);
err_setup_rx:
e1000_free_all_tx_resources(adapter);