linux-kernel - Re: 3.12: ethernet controller missing after resuming from suspend to RAM

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Date:	Mon, 10 Feb 2014 02:15:22 +0100
From:	Peter Wu <lekensteyn@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Bastien Traverse <bastien.traverse@...il.com>,
	linux-kernel@...r.kernel.org, francis.moro@...il.com,
	linux-pm@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: 3.12: ethernet controller missing after resuming from suspend to RAM

On Monday 10 February 2014 01:52:14 Rafael J. Wysocki wrote:
> > Could the following commit have something to do with it?
> >
> > 
> >
> > commit 4ebe34503baa0644c9352bcd76d4cf573bffe206
> > Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Date:   Tue Jul 16 22:10:35 2013 +0200
> >
> > 
> >     ACPI / hotplug / PCI: Check for new devices on enabled slots
> 
> This one, or another one in that series.  I rather suspect
> 
> ab1225901da2 Revert "ACPI / hotplug / PCI: Avoid doing too much for spurious
> notifies"
> 
> from Mika, but it really doesn't matter.
> 
> Can you please check the patch below (it is on top of 3.14-rc1, but I think
> it'll still apply to 3.13) and report back?

I applied the following patch:

--- drivers/pci/hotplug/acpiphp_glue.c.orig	2014-02-10 01:46:59.678124018 +0100
+++ drivers/pci/hotplug/acpiphp_glue.c	2014-02-10 01:48:59.634124004 +0100
@@ -552,10 +552,10 @@
 	struct pci_dev *dev;
 	struct pci_bus *bus = slot->bus;
 	struct acpiphp_func *func;
-	int max, pass;
+	int nr_found, max, pass, bridges_scanned = 0;
 	LIST_HEAD(add_list);
 
-	acpiphp_rescan_slot(slot);
+	nr_found = acpiphp_rescan_slot(slot);
 	max = acpiphp_max_busnr(bus);
 	for (pass = 0; pass < 2; pass++) {
 		list_for_each_entry(dev, &bus->devices, bus_list) {
@@ -571,9 +571,16 @@
 					__pci_bus_size_bridges(dev->subordinate,
 							       &add_list);
 				}
+				bridges_scanned++;
 			}
 		}
 	}
+	/* Nothing more to do here if there are no new devices on this bus. */
+	if (!nr_found && !bridges_scanned && (slot->flags & SLOT_ENABLED)) {
+		pr_debug("No more new devices on this bus.\n");
+		return;
+	}
+
 	__pci_bus_assign_resources(bus, &add_list, NULL);
 
 	acpiphp_sanitize_bus(bus);

Unfortunately, the adapter still vanishes. dmesg is below this message.

Peter

[   44.558995] CPU3 is up
[   44.561438] ACPI: Waking up from system sleep state S3
[   45.254084] ehci-pci 0000:00:1a.0: System wakeup disabled by ACPI
[   45.280727] ehci-pci 0000:00:1d.0: System wakeup disabled by ACPI
[   45.307403] xhci_hcd 0000:02:00.0: System wakeup disabled by ACPI
[   45.361012] PM: noirq resume of devices complete after 133.354 msecs
[   45.361292] PM: early resume of devices complete after 0.233 msecs
[   45.361680] iwlwifi 0000:05:00.0: RF_KILL bit toggled to enable radio.
[   45.361731] pcieport 0000:00:1c.1: System wakeup disabled by ACPI
[   45.470912] snd_hda_intel 0000:00:1b.0: irq 48 for MSI/MSI-X
[   45.700502] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   45.700533] ata5: SATA link down (SStatus 0 SControl 300)
[   45.701385] ata1.00: configured for UDMA/133
[   45.701503] sd 0:0:0:0: [sda] Starting disk
[   45.707139] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   45.872011] ata2.00: configured for UDMA/100
[   46.791141] PM: resume of devices complete after 1430.658 msecs
[   46.791560] PM: Finishing wakeup.
[   46.791565] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP03
[   46.791568] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP03
[   46.791642] acpiphp_glue: No more new devices on this bus.
[   46.791571] Restarting tasks ... done.
[   46.793204] video LNXVIDEO:00: Restoring backlight state
[   46.793211] video LNXVIDEO:01: Restoring backlight state
[   47.246425] ACPI: \_SB_.AC__: ACPI_NOTIFY_BUS_CHECK event: unsupported
[   47.251540] jme 0000:04:00.5: irq 50 for MSI/MSI-X
[   47.276949] jme 0000:04:00.5 eth0: Link is down
[   47.276974] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   47.278423] iwlwifi 0000:05:00.0: L1 Enabled; Disabling L0S
[   47.285758] iwlwifi 0000:05:00.0: Radio type=0x1-0x3-0x1
[   47.393492] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP01
[   47.393495] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP01
[   47.393517] acpiphp_glue: No more new devices on this bus.
[   47.393525] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP02
[   47.393527] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP02
[   47.398977] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   47.463615] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP03
[   47.463620] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP03
[   47.463685] acpiphp_glue: No more new devices on this bus.

After the last message, NetworkManager loses the interface within a second.
The next following messages follow two seconds later and are unrelated
(those are about wireless connectivity).
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