linux-kernel - Re: [PATCH] x86, olpc: Indicate that legacy PC platform should not register RTC

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Message-ID: <20181104112905.GB23864@amd>
Date:   Sun, 4 Nov 2018 12:29:06 +0100
From:   Pavel Machek <pavel@....cz>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, olpc: Indicate that legacy PC platform should not
 register RTC

On Thu 2018-10-04 18:08:08, Lubomir Rintel wrote:
> On OLPC XO-1 we're discovering the RTC via device tree from the arch
> initcall. Don't let the PC platform register another one from its
> device initcall, it's not going to work:
> 
>   sysfs: cannot create duplicate filename '/devices/platform/rtc_cmos'
>   CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #12
>   Hardware name: OLPC XO/XO, BIOS OLPC Ver 1.00.01 06/11/2014
>   Call Trace:
>    dump_stack+0x16/0x18
>    sysfs_warn_dup+0x46/0x58
>    sysfs_create_dir_ns+0x76/0x9b
>    kobject_add_internal+0xed/0x209
>    ? __schedule+0x3fa/0x447
>    kobject_add+0x5b/0x66
>    device_add+0x298/0x535
>    ? insert_resource_conflict+0x2a/0x3e
>    platform_device_add+0x14d/0x192
>    ? io_delay_init+0x19/0x19
>    platform_device_register+0x1c/0x1f
>    add_rtc_cmos+0x16/0x31
>    do_one_initcall+0x78/0x14a
>    ? do_early_param+0x75/0x75
>    kernel_init_freeable+0x152/0x1e0
>    ? rest_init+0xa2/0xa2
>    kernel_init+0x8/0xd5
>    ret_from_fork+0x2e/0x38
>   kobject_add_internal failed for rtc_cmos with -EEXIST, don't try to
>     register things with the same name in the same directory.
>   platform rtc_cmos: registered platform RTC device (no PNP device found)
> 
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>

Acked-by: Pavel Machek <pavel@....cz>


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