linux-kernel - Re: [lkp-robot] [platform/x86] bff589be59: kmsg.dell_wmi:Cannot_read_Dell_descriptor

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Date:   Thu, 20 Jul 2017 11:36:59 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Darren Hart <dvhart@...radead.org>,
        Mario Limonciello <mario_limonciello@...l.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKP <lkp@...org>, kernel test robot <xiaolong.ye@...el.com>
Subject: Re: [lkp-robot] [platform/x86] bff589be59: kmsg.dell_wmi:Cannot_read_Dell_descriptor_buffer

On Thu, Jul 20, 2017 at 9:23 AM, Pali Rohár <pali.rohar@...il.com> wrote:
> On Thursday 20 July 2017 09:02:20 kernel test robot wrote:
>> commit: bff589be59c50924a9715951160578e570cba5c6 ("platform/x86: dell-wmi: Convert to the WMI bus infrastructure")
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>>
>> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>>
>> [    7.104086] dell_wmi: Cannot read Dell descriptor buffer - 1
>
> Hi Andy! Problem is in following code:
>
> static int __init dell_wmi_init(void)
> {
>         int err;
>
>         err = dell_wmi_check_descriptor_buffer();
>         if (err)
>                 return err;
>
>         dmi_check_system(dell_wmi_smbios_list);
>
>         if (wmi_requires_smbios_request) {
>                 err = dell_wmi_events_set_enabled(true);
>                 if (err) {
>                         pr_err("Failed to enable WMI events\n");
>                         return err;
>                 }
>         }
>
>         return wmi_driver_register(&dell_wmi_driver);
> }
> module_init(dell_wmi_init);
>
> static void __exit dell_wmi_exit(void)
> {
>         if (wmi_requires_smbios_request)
>                 dell_wmi_events_set_enabled(false);
>
>         wmi_driver_unregister(&dell_wmi_driver);
> }
> module_exit(dell_wmi_exit);
>
> dell_wmi_init and dell_wmi_exit should just call wmi_driver_register and
> wmi_driver_unregister.
>
> All those other calls (like different checks or enabling wmi events)
> should be done in dell_wmi_probe from dell_wmi_driver structure. Same
> for dell_wmi_remove.
>
> Basically with this bus interface you should be able to load dell-wmi.ko
> also on non-dell machines. Just bus code would not create and register
> wmi device and so no probe would be called.

Yep.  Fix coming once I test it.

>
> --
> Pali Rohár
> pali.rohar@...il.com