From 34edaa88324004baf4884fb0388f86059d9c4878 Mon Sep 17 00:00:00 2001 From: Tobias Diedrich Date: Mon, 16 Feb 2009 00:13:20 -0800 Subject: [PATCH] net: forcedeth: Fix wake-on-lan regression Commit f55c21fd9a92a444e55ad1ca4e4732d56661bf2e ("forcedeth: call restore mac addr in nv_shutdown path"), which was introduced to fix the regression tracked at http://bugzilla.kernel.org/show_bug.cgi?id=11358 causes the wake-on-lan mac to be reversed in the shutdown path. Apparently the forcedeth situation is rather messy in that the mac we need to writeback for a subsequent modprobe to work is exactly the reverse of what is needed for proper wake-on-lan. The following patch explains the situation in the comments and makes the call to nv_restore_mac_addr() conditional (only called if we are not really going for poweroff). Tobias Diedrich wrote: > Hmm, I had not tried WOL for some time. > With 2.6.29-rc3 is see the following behaviour: > > State WOL Behaviour > ------------------------------ > shutdown reversed MAC > disk/shutdown reversed MAC > disk/platform OK > > Apparently nv_restore_mac_addr() restores the MAC in the wrong order > for WOL (at least for my PCI_DEVICE_ID_NVIDIA_NVENET_15). platform > works, because the MAC is not touched in the nv_suspend() path. > > A possible fix might be to only call nv_restore_mac_addr() if > system_state != SYSTEM_POWER_OFF. With the following patch: shutdown OK disk/shutdown OK disk/platform OK kexec OK Signed-off-by: Tobias Diedrich Tested-by: Philipp Matthias Hahn Signed-off-by: David S. Miller --- drivers/net/forcedeth.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index 5b910cf63740..b8251e827059 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -6011,9 +6011,20 @@ static void nv_shutdown(struct pci_dev *pdev) if (netif_running(dev)) nv_close(dev); - nv_restore_mac_addr(pdev); + /* + * Restore the MAC so a kernel started by kexec won't get confused. + * If we really go for poweroff, we must not restore the MAC, + * otherwise the MAC for WOL will be reversed at least on some boards. + */ + if (system_state != SYSTEM_POWER_OFF) { + nv_restore_mac_addr(pdev); + } pci_disable_device(pdev); + /* + * Apparently it is not possible to reinitialise from D3 hot, + * only put the device into D3 if we really go for poweroff. + */ if (system_state == SYSTEM_POWER_OFF) { if (pci_enable_wake(pdev, PCI_D3cold, np->wolenabled)) pci_enable_wake(pdev, PCI_D3hot, np->wolenabled); -- 2.20.1