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Message-ID: <20160919130324.GI1811@lahna.fi.intel.com>
Date: Mon, 19 Sep 2016 16:03:24 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Nicolai Stange <nicstange@...il.com>
Cc: Wolfram Sang <wsa@...-dreams.de>,
Octavian Purdila <octavian.purdila@...el.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION? v4.8] i2c-core: acpi_i2c_get_info() touches
non-existent devices
On Mon, Sep 19, 2016 at 11:48:07AM +0300, Mika Westerberg wrote:
> On Mon, Sep 19, 2016 at 12:30:53AM +0200, Nicolai Stange wrote:
> > Hi,
> >
> > I'm encountering the following:
> >
> > [ 10.409490] ERROR: Unable to locate IOAPIC for GSI 37
> >
> > Note that the system works fine, so it's a "cosmetic" regression, I think.
> >
> >
> > I added a dump_stack() right below the printk() in question and it reads
> > as
> >
> > [ 10.410290] CPU: 6 PID: 710 Comm: systemd-udevd Not tainted 4.7.0-rc4+ #348
> > [ 10.410962] Hardware name: Dell Inc. Latitude E6540/0725FP, BIOS A10 06/26/2014
> > [ 10.411772] 0000000000000286 00000000b9050627 ffff8800c2e5f590 ffffffffa54161e7
> > [ 10.412569] 0000000000000025 0000000000000001 ffff8800c2e5f5a0 ffffffffa50465df
> > [ 10.413292] ffff8800c2e5f5d0 ffffffffa5046ffd 0000000000000000 0000000000000025
> > [ 10.414016] Call Trace:
> > [ 10.414713] [<ffffffffa54161e7>] dump_stack+0x68/0xa1
> > [ 10.415406] [<ffffffffa50465df>] mp_find_ioapic+0x4f/0x60
> > [ 10.416131] [<ffffffffa5046ffd>] mp_map_gsi_to_irq+0x1d/0xc0
> > [ 10.416806] [<ffffffffa503dbbb>] acpi_register_gsi_ioapic+0x7b/0x170
> > [ 10.417494] [<ffffffffa503da6f>] acpi_register_gsi+0xf/0x20
> > [ 10.418217] [<ffffffffa54a14d5>] acpi_dev_get_irqresource.part.3+0xd7/0x11d
> > [ 10.418871] [<ffffffffa54a139a>] ? acpi_dev_resource_address_space+0x31/0x67
> > [ 10.419655] [<ffffffffa54a168d>] acpi_dev_resource_interrupt+0x9b/0xab
> > [ 10.420408] [<ffffffffa54a1848>] acpi_dev_process_resource+0xbc/0xf7
> > [ 10.421070] [<ffffffffa54a178c>] ? acpi_dev_resource_memory+0x7c/0x7c
> > [ 10.421732] [<ffffffffa54c3ba2>] acpi_walk_resource_buffer+0x4d/0x85
> > [ 10.422399] [<ffffffffa54a178c>] ? acpi_dev_resource_memory+0x7c/0x7c
> > [ 10.423158] [<ffffffffa54c3e89>] acpi_walk_resources+0x83/0xb6
> > [ 10.423831] [<ffffffffa54a15b1>] acpi_dev_get_resources+0x96/0xd7
> > [ 10.424505] [<ffffffffa563f7c4>] acpi_i2c_get_info+0xe4/0x1a0
> > [ 10.425181] [<ffffffffa5642c06>] acpi_i2c_add_device+0x56/0xa0
> > [ 10.425856] [<ffffffffa54bf2ff>] acpi_ns_walk_namespace+0xe8/0x19d
> > [ 10.426564] [<ffffffffa5642bb0>] ? acpi_i2c_register_device+0x70/0x70
> > [ 10.427418] [<ffffffffa5642bb0>] ? acpi_i2c_register_device+0x70/0x70
> > [ 10.428179] [<ffffffffa54bf83d>] acpi_walk_namespace+0xa0/0xd5
> > [ 10.428858] [<ffffffffa56437a9>] i2c_register_adapter+0x369/0x500
> > [ 10.429499] [<ffffffffa564399c>] i2c_add_adapter+0x5c/0x70
> > [ 10.430125] [<ffffffffc07df7dd>] i801_probe+0x2bd/0x6a0 [i2c_i801]
> > [ 10.431159] [<ffffffffa50eb8dd>] ? trace_hardirqs_on+0xd/0x10
> > [ 10.432196] [<ffffffffa54682f2>] local_pci_probe+0x42/0xa0
> > [ 10.432826] [<ffffffffa5468e2a>] ? pci_match_device+0xca/0x110
> > [ 10.433460] [<ffffffffa5469243>] pci_device_probe+0x103/0x150
> > [ 10.434083] [<ffffffffa5545acc>] driver_probe_device+0x22c/0x440
> > [ 10.434712] [<ffffffffa5545db5>] __driver_attach+0xd5/0x100
> > [ 10.435341] [<ffffffffa5545ce0>] ? driver_probe_device+0x440/0x440
> > [ 10.435963] [<ffffffffa5543313>] bus_for_each_dev+0x73/0xc0
> > [ 10.436676] [<ffffffffa554519e>] driver_attach+0x1e/0x20
> > [ 10.437356] [<ffffffffa5544bc6>] bus_add_driver+0x1c6/0x290
> > [ 10.437978] [<ffffffffc07e5000>] ? 0xffffffffc07e5000
> > [ 10.438699] [<ffffffffa5546a50>] driver_register+0x60/0xe0
> > [ 10.439502] [<ffffffffc07e5000>] ? 0xffffffffc07e5000
> > [ 10.440310] [<ffffffffa5467e4d>] __pci_register_driver+0x5d/0x60
> > [ 10.440313] [<ffffffffc07e50af>] i2c_i801_init+0xaf/0x1000 [i2c_i801]
> > [ 10.440314] [<ffffffffc07e5000>] ? 0xffffffffc07e5000
> > [ 10.440316] [<ffffffffa5000450>] do_one_initcall+0x50/0x180
> > [ 10.440319] [<ffffffffa5101cc5>] ? rcu_read_lock_sched_held+0x45/0x80
> > [ 10.440322] [<ffffffffa5234e55>] ? kmem_cache_alloc_trace+0x2d5/0x340
> > [ 10.440325] [<ffffffffa51c1252>] do_init_module+0x5f/0x1da
> > [ 10.440329] [<ffffffffa512d615>] load_module+0x2195/0x2950
> > [ 10.440331] [<ffffffffa512a0e0>] ? __symbol_put+0x70/0x70
> > [ 10.440334] [<ffffffffa525dd3b>] ? vfs_read+0x11b/0x130
> > [ 10.440337] [<ffffffffa512e066>] SYSC_finit_module+0xe6/0x120
> > [ 10.440339] [<ffffffffa512e0be>] SyS_finit_module+0xe/0x10
> > [ 10.440340] [<ffffffffa5002fb1>] do_syscall_64+0x61/0x170
> > [ 10.440343] [<ffffffffa581e1da>] entry_SYSCALL64_slow_path+0x25/0x25
> >
> >
> > I bisected this to commit 525e6fabeae2 ("i2c / ACPI: add support for
> > ACPI reconfigure notifications").
> >
> > The reason for the above message seems to be that acpi_i2c_get_info()
> > configures the IRQs for any ACPI devices that have got some
> > I2cSerialBus() resource, regardless of the actual adapter those are
> > attached to. This behaviour is different from before that commit.
> >
> > My ACPI DSDT has got a PCI I2C adapter that isn't physically present, it
> > seems. No clue why.
> >
> > That non-existent PCI I2C adapter is in turn I2cSerialBus()-referenced
> > by some ACPI device that has got exactly this interrupt 37 assigned.
> >
> > So it looks like an attempt is made to configure this non-existent,
> > ACPI-listed I2C slave's IRQs when an actually existing I2C adapter (i801
> > SMBus) gets probed.
> >
> >
> > Let me know if I can provide you with any additional information,
>
> Can you send me acpidump from that that machine?
Can you try if the following patch cures the problem?
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index da3a02ef4a31..4e6c6fde9bdb 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -205,7 +205,7 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
void *data, void **return_value)
{
struct i2c_adapter *adapter = data;
- struct acpi_device *adev;
+ struct acpi_device *adev, *adapter_adev;
acpi_handle adapter_handle;
struct i2c_board_info info;
@@ -218,6 +218,12 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
if (adapter_handle != ACPI_HANDLE(&adapter->dev))
return AE_OK;
+ /* The adapter must be present */
+ if (acpi_bus_get_device(adapter_handle, &adapter_adev))
+ return AE_OK;
+ if (acpi_bus_get_status(adapter_adev) || !adapter_adev->status.present)
+ return AE_OK;
+
acpi_i2c_register_device(adapter, adev, &info);
return AE_OK;
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