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

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Date:   Thu, 1 Jun 2023 16:44:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        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 Thu, Jun 01, 2023 at 05:09:52PM +0200, Marek Szyprowski wrote:
> 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.

Oh good, I guess it wouldn't work at all as the serial_core is needed by
all of those drivers first too, so this should work, thanks for
checking.

greg k-h