e100: fix device suspend/resume

[ Upstream commit 5d2ca2e12dfb2aff3388ca57b06f570fa6206ced ]

As reported in [1], e100 was no longer working for suspend/resume
cycles. The previous commit mentioned in the fixes appears to have
broken things and this attempts to practice best known methods for
device power management and keep wake-up working while allowing
suspend/resume to work. To do this, I reorder a little bit of code
and fix the resume path to make sure the device is enabled.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=214933

Fixes: 69a74aef8a18 ("e100: use generic power management")
Cc: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Reported-by: Alexey Kuznetsov <axet@me.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Alexey Kuznetsov <axet@me.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 09ae1939e6db4c7cc32e89708aa871763a543d91..36d52246bdc668528e7c8fa04935baeffb87c476 100644 (file)
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -3003,9 +3003,10 @@ static void __e100_shutdown(struct pci_dev *pdev, bool *enable_wake)
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct nic *nic = netdev_priv(netdev);
 
+       netif_device_detach(netdev);
+
        if (netif_running(netdev))
                e100_down(nic);
-       netif_device_detach(netdev);
 
        if ((nic->flags & wol_magic) | e100_asf(nic)) {
                /* enable reverse auto-negotiation */
@@ -3022,7 +3023,7 @@ static void __e100_shutdown(struct pci_dev *pdev, bool *enable_wake)
                *enable_wake = false;
        }
 
-       pci_clear_master(pdev);
+       pci_disable_device(pdev);
 }
 
 static int __e100_power_off(struct pci_dev *pdev, bool wake)
@@ -3042,8 +3043,6 @@ static int __maybe_unused e100_suspend(struct device *dev_d)
 
        __e100_shutdown(to_pci_dev(dev_d), &wake);
 
-       device_wakeup_disable(dev_d);
-
        return 0;
 }
 
@@ -3051,6 +3050,14 @@ static int __maybe_unused e100_resume(struct device *dev_d)
 {
        struct net_device *netdev = dev_get_drvdata(dev_d);
        struct nic *nic = netdev_priv(netdev);
+       int err;
+
+       err = pci_enable_device(to_pci_dev(dev_d));
+       if (err) {
+               netdev_err(netdev, "Resume cannot enable PCI device, aborting\n");
+               return err;
+       }
+       pci_set_master(to_pci_dev(dev_d));
 
        /* disable reverse auto-negotiation */
        if (nic->phy == phy_82552_v) {
@@ -3062,10 +3069,11 @@ static int __maybe_unused e100_resume(struct device *dev_d)
                           smartspeed & ~(E100_82552_REV_ANEG));
        }
 
-       netif_device_attach(netdev);
        if (netif_running(netdev))
                e100_up(nic);
 
+       netif_device_attach(netdev);
+
        return 0;
 }