linux-kernel - Re: [PATCH v2 1/1] serial: core: Fix serial_base_match() after fixing controller port name

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Message-ID: <20230805044910.GJ14799@atomide.com>
Date:   Sat, 5 Aug 2023 07:49:10 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH v2 1/1] serial: core: Fix serial_base_match() after
 fixing controller port name

* Guenter Roeck <linux@...ck-us.net> [230804 21:42]:
> On Thu, Aug 03, 2023 at 10:10:32AM +0300, Tony Lindgren wrote:
> > While fixing DEVNAME to be more usable, I broke serial_base_match() as the
> > ctrl and port prefix for device names seemed unnecessary.
> > 
> > The prefixes are still needed by serial_base_match() to probe the serial
> > base controller port, and serial tx is now broken.
> > 
> > Let's fix the issue by checking against dev->type and drv->name instead
> > of the prefixes that are no longer in the DEVNAME.
> > 
> > Fixes: 1ef2c2df1199 ("serial: core: Fix serial core controller port name to show controller id")
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> > Closes: https://lore.kernel.org/oe-lkp/202308021529.35b3ad6c-oliver.sang@intel.com
> > Signed-off-by: Tony Lindgren <tony@...mide.com>
> 
> With this patch applied, I see the following traceback in the pending-fixes
> branch.
> 
> Bisect log attached as well. It actually points to commit d962de6ae51f
> ("serial: core: Fix serial core port id to not use port->line").
> Bisect was on mips, but I also see problems on arm, ppc, and sparc.
> sparc boot tests show the warning message and then stall until aborted
> (which of course may be a different problem).

Sorry about all the hassles and thanks for testing again.

I too noticed several issues remaining after testing reloading the hardware
specific serial driver, the issues I saw should be fixed in tty-linus.

> kobject: kobject_add_internal failed for serial8250.0:0.0 with -EEXIST, don't try to register things with the same name in the same directory.
> serial8250 serial8250.0: unable to register port at index 1 (IO2f8 MEM0 IRQ3): -17
> sysfs: cannot create duplicate filename '/devices/platform/serial8250.0/serial8250.0:0/serial8250.0:0.0'

The issue above should be fixed with commit:

bbb4abb1bcfb ("serial: 8250: Reinit port_id when adding back serial8250_isa_devs")

Not sure about the sparc one you mentioned, but let's when you run your
tests again.

Regards,

Tony