linux-kernel - Re: [PATCH] serial: core: Fix probing serial_base

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Date:   Thu, 1 Jun 2023 17:09:52 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: core: Fix probing serial_base_bus devices

On 01.06.2023 16:21, Greg Kroah-Hartman wrote:
> On Thu, Jun 01, 2023 at 05:14:44PM +0300, Tony Lindgren wrote:
>> If a physical serial port device driver uses arch_initcall() we fail to
>> probe the serial_base_bus devices and the serial port tx fails. This is
>> because as serial_base_bus uses module_initcall().
>>
>> Let's fix the issue by changing serial_base_bus to use arch_initcall().
> This will only work if the linking order is such that this will always
> come before the drivers.  Is that the case here?

Yes, serial_base_bus is linked as a second object, just after the 
serial_core. Device drivers come later.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland