e1000e: register pm_qos request on hardware activation

The pm_qos_add_request call has to register the pm_qos request with the pm_qos
susbsystem before first use of the pm_qos request via
pm_qos_update_request.

As pm_qos changed to use plists there is no benefit in registering and
unregistering the pm_qos request on ifup/ifdown and thus we move the
registering into e1000_open and the unregistering in e1000_close.

This fixes the following warning:

[    1.786060] WARNING: at kernel/pm_qos_params.c:264
pm_qos_update_request+0x28/0x54()
[    1.786088] Hardware name: Latitude E6500
[    1.787045] pm_qos_update_request() called for unknown object
[    1.787966] Modules linked in:
[    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
[    1.790035] Call Trace:
[    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
[    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
[    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
[    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
[    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
[    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
[    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
[    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
[    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
[    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
[    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
[    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
[    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
[    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
[    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
[    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
[    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
[    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
[    1.809958] ---[ end trace 84b562a00a60539e ]---

Signed-off-by: Florian Mickler <florian@mickler.org>
Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 12 deletions

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index afd01295fbec..464c9a28f1ba 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -3218,12 +3218,6 @@ int e1000e_up(struct e1000_adapter *adapter)
 {
         struct e1000_hw *hw = &adapter->hw;
 
-        /* DMA latency requirement to workaround early-receive/jumbo issue */
-        if (adapter->flags & FLAG_HAS_ERT)
-                adapter->netdev->pm_qos_req =
-                        pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
-                                       PM_QOS_DEFAULT_VALUE);
-
         /* hardware has been reset, we need to reload some things */
         e1000_configure(adapter);
 
@@ -3287,12 +3281,6 @@ void e1000e_down(struct e1000_adapter *adapter)
         e1000_clean_tx_ring(adapter);
         e1000_clean_rx_ring(adapter);
 
-        if (adapter->flags & FLAG_HAS_ERT) {
-                pm_qos_remove_request(
-                              adapter->netdev->pm_qos_req);
-                adapter->netdev->pm_qos_req = NULL;
-        }
-
         /*
          * TODO: for power management, we could drop the link and
          * pci_disable_device here.
@@ -3527,6 +3515,12 @@ static int e1000_open(struct net_device *netdev)
              E1000_MNG_DHCP_COOKIE_STATUS_VLAN))
                 e1000_update_mng_vlan(adapter);
 
+        /* DMA latency requirement to workaround early-receive/jumbo issue */
+        if (adapter->flags & FLAG_HAS_ERT)
+                adapter->netdev->pm_qos_req =
+                                    pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
+                                                       PM_QOS_DEFAULT_VALUE);
+
         /*
          * before we allocate an interrupt, we must be ready to handle it.
          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
@@ -3631,6 +3625,11 @@ static int e1000_close(struct net_device *netdev)
         if (adapter->flags & FLAG_HAS_AMT)
                 e1000_release_hw_control(adapter);
 
+        if (adapter->flags & FLAG_HAS_ERT) {
+                pm_qos_remove_request(adapter->netdev->pm_qos_req);
+                adapter->netdev->pm_qos_req = NULL;
+        }
+
         pm_runtime_put_sync(&pdev->dev);
 
         return 0;