acpi_wmi noisy without EC

[Vladimir Kondratyev]

On 2020-11-17 10:57, Vladimir Kondratyev wrote:
> On 2020-11-17 03:00, Yuri Pankov wrote:
>> I have started seeing the following on boot since some time:
>> 
>> acpi_wmi0: <ACPI-WMI mapping> on acpi0
>> acpi_wmi0: cannot find EC device
>> device_attach: acpi_wmi0 attach returned 6
>> acpi_wmi0: <ACPI-WMI mapping> on acpi0
>> acpi_wmi0: cannot find EC device
>> device_attach: acpi_wmi0 attach returned 6
>> acpi_wmi0: <ACPI-WMI mapping> on acpi0
>> acpi_wmi0: cannot find EC device
>> device_attach: acpi_wmi0 attach returned 6
>> acpi_wmi0: <ACPI-WMI mapping> on acpi0
>> acpi_wmi0: cannot find EC device
>> device_attach: acpi_wmi0 attach returned 6
>> 
>> Likely following this commit:
>> 
>> commit 708d048ccfdacf6199cc08a56aa05a9c899441fd
>> Author: Vladimir Kondratyev <wulf at FreeBSD.org>
>> Date:   Sat Oct 31 22:19:39 2020 +0000
>> 
>>     acpi_wmi(4): Add ACPI_PNP_INFO
>> 
>> While the reason is obvious -- there's no EC in this system (Gigabyte
>> X299X AORUS MASTER desktop motherboard), at least searching the
>> `acpidump -dt` output doesn't show any PNP0C09 entries -- it certainly
>> looks like "something is broken" when first noticed.  I wonder if we
>> could/should handle this gracefully -- no EC, do nothing, simply exit?
> 
> Following patch should ignore missing EC like Linux does. Could you 
> test it?
> 
> diff --git a/sys/dev/acpi_support/acpi_wmi.c 
> b/sys/dev/acpi_support/acpi_wmi.c
> index 379cfd1705f1..efae96cdcc9a 100644
> --- a/sys/dev/acpi_support/acpi_wmi.c
> +++ b/sys/dev/acpi_support/acpi_wmi.c
> @@ -246,7 +246,7 @@ acpi_wmi_attach(device_t dev)
>  	if ((sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0))
>  	    == NULL)
>  		device_printf(dev, "cannot find EC device\n");
> -	else if (ACPI_FAILURE((status = 
> AcpiInstallNotifyHandler(sc->wmi_handle,
> +	if (ACPI_FAILURE((status = AcpiInstallNotifyHandler(sc->wmi_handle,
>  		    ACPI_DEVICE_NOTIFY, acpi_wmi_notify_handler, sc))))
>  		device_printf(sc->wmi_dev, "couldn't install notify handler - %s\n",
>  		    AcpiFormatException(status));
> @@ -701,6 +701,8 @@ acpi_wmi_ec_handler(UINT32 function,
> ACPI_PHYSICAL_ADDRESS address,
>  		return (AE_BAD_PARAMETER);
>  	if (address + (width / 8) - 1 > 0xFF)
>  		return (AE_BAD_ADDRESS);
> +	if (sc->ec_dev == NULL)
> +		return (AE_NOT_FOUND);
>  	if (function == ACPI_READ)
>  		*value = 0;
>  	ec_addr = address;

@#@##! Web client ate all the tabs.

Patch is in attachment.

-- 
WBR
Vladimir Kondratyev
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