This is a note to let you know that I've just added the patch titled
e1000e: avoid failing the system during pm_suspend
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
e1000e-avoid-failing-the-system-during-pm_suspend.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4c15b3be82fbc637abc973cacb2c5d482920b47a
Author: Vitaly Lifshits <vitaly.lifshits@xxxxxxxxx>
Date: Tue Aug 6 16:23:48 2024 +0300
e1000e: avoid failing the system during pm_suspend
[ 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 <dima.ruinskiy@xxxxxxxxx>
Signed-off-by: Vitaly Lifshits <vitaly.lifshits@xxxxxxxxx>
Tested-by: Mor Bar-Gabay <morx.bar.gabay@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 334f652c60601..d377a286c0e1b 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -6672,8 +6672,10 @@ 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);
@@ -6694,8 +6696,10 @@ 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;
+ }
}
/* Force SMBUS to allow WOL */
@@ -6744,6 +6748,7 @@ 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.
*/
@@ -6986,15 +6991,13 @@ static __maybe_unused 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 __maybe_unused int e1000e_pm_resume(struct device *dev)
