linux-kernel - [PATCH v2 0/2] serial: imx: fix unregister/register console

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Message-Id: <20211020192643.476895-1-francesco.dolcini@toradex.com>
Date:   Wed, 20 Oct 2021 21:26:41 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, u.kleine-koenig@...gutronix.de,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH v2 0/2] serial: imx: fix unregister/register console

Hi,
here a couple of fixes to properly handle imx serial console
unregister/register at runtime.

The patch from Stefan was already posted years ago but never merged [1],
however is still valid and it's pretty easy to trigger the problem. We have
this patch in our kernel tree since 3 years, but for some reason we never
managed to upstream it.

As correctly wrote by Uwe [2] this issue affects multiple drivers, I could
provide a patch for those, but I will not have any way to test it.

The second patch is required to have a balanced clock enable/disable
when doing console register/unregister.

The issue is present at least since
a3cb39d258ef ("serial: core: Allow detach and attach serial device for console")

[1] https://marc.info/?l=linux-serial&m=154221779312036&w=2
[2] https://lore.kernel.org/all/20211014081028.xafpuzrxk3jvv5qn@pengutronix.de/

Changes in v2:
  Improved commit message and added fixes tag.

---

Francesco Dolcini (1):
  serial: imx: disable console clocks on unregister

Stefan Agner (1):
  serial: imx: fix detach/attach of serial console

 drivers/tty/serial/imx.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

-- 
2.25.1