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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727264252; bh=ciuVZY1rdMMVrvRZTkT1u1DqPLrRARwpj3mewshSF6s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CCR0hNXZ/VIJ460pr70204/jp3Nib1t7do9NiATNdT+aLHvn3cV8IuFq18PLMAJ/H /F4rigSp36IK5YbdESUgvJYDFsN70rVnrLx5Jauf86+pQJzc1g+oKNVjWeYjHr6Glu tNC7L6MSKNDoKE8ysYkzt5NHb/yClvn7UPMuoeZknwZPOQtp1Bi1JppOi1EdSzrtsz PKtIJ1s7dmgiJQ5+Wz3EyRHqnHs52xrO+Hy0RM1oMdFHvm/kDv2aF1NZnexglkonAV ecbm4qztCfNmc1+q477sjPf7kTwPufFlWHkcWspy+RVC6lL0PoJvuLUus16MMKQ/t6 MQhS26sJ/1P4Q== X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=CCR0hNXZ Subject: [Intel-wired-lan] [PATCH AUTOSEL 6.11 022/244] e1000e: avoid failing the system during pm_suspend X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , pabeni@redhat.com, przemyslaw.kitszel@intel.com, Mor Bar-Gabay , edumazet@google.com, netdev@vger.kernel.org, Tony Nguyen , kuba@kernel.org, Vitaly Lifshits , Dima Ruinskiy , davem@davemloft.net, intel-wired-lan@lists.osuosl.org Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Vitaly Lifshits [ Upstream commit 0a6ad4d9e1690c7faa3a53f762c877e477093657 ] Occasionally when the system goes into pm_suspend, the suspend might fail due to a PHY access error on the network adapter. Previously, this would have caused the whole system to fail to go to a low power state. An example of this was reported in the following Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205015 [ 1663.694828] e1000e 0000:00:19.0 eth0: Failed to disable ULP [ 1664.731040] asix 2-3:1.0 eth1: link up, 100Mbps, full-duplex, lpa 0xC1E1 [ 1665.093513] e1000e 0000:00:19.0 eth0: Hardware Error [ 1665.596760] e1000e 0000:00:19.0: pci_pm_resume+0x0/0x80 returned 0 after 2975399 usecs and then the system never recovers from it, and all the following suspend failed due to this [22909.393854] PM: pci_pm_suspend(): e1000e_pm_suspend+0x0/0x760 [e1000e] returns -2 [22909.393858] PM: dpm_run_callback(): pci_pm_suspend+0x0/0x160 returns -2 [22909.393861] PM: Device 0000:00:1f.6 failed to suspend async: error -2 This can be avoided by changing the return values of __e1000_shutdown and e1000e_pm_suspend functions so that they always return 0 (success). This is consistent with what other drivers do. If the e1000e driver encounters a hardware error during suspend, potential side effects include slightly higher power draw or non-working wake on LAN. This is preferred to a system-level suspend failure, and a warning message is written to the system log, so that the user can be aware that the LAN controller experienced a problem during suspend. Link: https://bugzilla.kernel.org/show_bug.cgi?id=205015 Suggested-by: Dima Ruinskiy Signed-off-by: Vitaly Lifshits Tested-by: Mor Bar-Gabay Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/e1000e/netdev.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 360ee26557f77..f103249b12fac 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -6671,8 +6671,10 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool runtime) if (adapter->flags2 & FLAG2_HAS_PHY_WAKEUP) { /* enable wakeup by the PHY */ retval = e1000_init_phy_wakeup(adapter, wufc); - if (retval) - return retval; + if (retval) { + e_err("Failed to enable wakeup\n"); + goto skip_phy_configurations; + } } else { /* enable wakeup by the MAC */ ew32(WUFC, wufc); @@ -6693,8 +6695,10 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool runtime) * or broadcast. */ retval = e1000_enable_ulp_lpt_lp(hw, !runtime); - if (retval) - return retval; + if (retval) { + e_err("Failed to enable ULP\n"); + goto skip_phy_configurations; + } } } @@ -6726,6 +6730,7 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool runtime) hw->phy.ops.release(hw); } +skip_phy_configurations: /* Release control of h/w to f/w. If f/w is AMT enabled, this * would have already happened in close and is redundant. */ @@ -6968,15 +6973,13 @@ static int e1000e_pm_suspend(struct device *dev) e1000e_pm_freeze(dev); rc = __e1000_shutdown(pdev, false); - if (rc) { - e1000e_pm_thaw(dev); - } else { + if (!rc) { /* Introduce S0ix implementation */ if (adapter->flags2 & FLAG2_ENABLE_S0IX_FLOWS) e1000e_s0ix_entry_flow(adapter); } - return rc; + return 0; } static int e1000e_pm_resume(struct device *dev) -- 2.43.0