linux-kernel - Re: [PATCH v5 3/3] serial: core: Fix serial core controller port name to show controller id

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Date:   Thu, 3 Aug 2023 15:18:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tony Lindgren <tony@...mide.com>
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
Subject: Re: [PATCH v5 3/3] serial: core: Fix serial core controller port
 name to show controller id

On Tue, Jul 25, 2023 at 08:42:12AM +0300, Tony Lindgren wrote:
> We are missing the serial core controller id for the serial core port
> name. Let's fix the issue for sane sysfs output, and to avoid issues
> addressing serial ports later on.
> 
> And as we're now showing the controller id, the "ctrl" and "port" prefix
> for the DEVNAME become useless, we can just drop them. Let's standardize on
> DEVNAME:0 for controller name, where 0 is the controller id. And
> DEVNAME:0.0 for port name, where 0.0 are the controller id and port id.
> 
> This makes the sysfs output nicer, on qemu for example:
> 
> $ ls /sys/bus/serial-base/devices
> 00:04:0         serial8250:0    serial8250:0.2
> 00:04:0.0       serial8250:0.1  serial8250:0.3
> 
> Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
> Reported-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>

This patch causes about 50% of my boot tests to fail because the console
is no longer recognized. Reverting this patch fixes the problem.
Bisect log attached.

Guenter

---
# bad: [35245ef82c5b8206d97d0296017df658fd8ea3d2] Merge branch 'for-linux-next-fixes' of git://anongit.freedesktop.org/drm/drm-misc
# good: [5d0c230f1de8c7515b6567d9afba1f196fb4e2f4] Linux 6.5-rc4
git bisect start 'HEAD' 'v6.5-rc4'
# good: [ec0f64d0666ce02114b11efd3df3234f7a3497d8] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git
git bisect good ec0f64d0666ce02114b11efd3df3234f7a3497d8
# bad: [8eb8b701a263abed01d3fd7e7f1984ef37b02149] Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git
git bisect bad 8eb8b701a263abed01d3fd7e7f1984ef37b02149
# good: [f29c3a80b329fbfbf92278c29fdcaafb736e3d01] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git
git bisect good f29c3a80b329fbfbf92278c29fdcaafb736e3d01
# bad: [eddb92c4c656a669c30e17ce934e5eba8c261392] Merge branch 'fixes-togreg' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git
git bisect bad eddb92c4c656a669c30e17ce934e5eba8c261392
# good: [6811694eb2f6b7a4e97be2029edc7dd6a39460f8] iio: imu: lsm6dsx: Fix mount matrix retrieval
git bisect good 6811694eb2f6b7a4e97be2029edc7dd6a39460f8
# bad: [1ef2c2df11997b8135f34adcf2c200d3b4aacbe9] serial: core: Fix serial core controller port name to show controller id
git bisect bad 1ef2c2df11997b8135f34adcf2c200d3b4aacbe9
# good: [83c35180abfdfb22f3d7703b0c85ad2d442ed2c5] serial: core: Controller id cannot be negative
git bisect good 83c35180abfdfb22f3d7703b0c85ad2d442ed2c5
# good: [d962de6ae51f9b76ad736220077cda83084090b1] serial: core: Fix serial core port id to not use port->line
git bisect good d962de6ae51f9b76ad736220077cda83084090b1
# first bad commit: [1ef2c2df11997b8135f34adcf2c200d3b4aacbe9] serial: core: Fix serial core controller port name to show controller id