linux-kernel - Re: [PATCH v4 0/8] serial: qcom-geni: Overhaul TX handling to fix crashes/hangs

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Date: Tue, 18 Jun 2024 12:19:31 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Douglas Anderson <dianders@...omium.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>
Cc: Yicong Yang <yangyicong@...ilicon.com>, Tony Lindgren <tony@...mide.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Johan Hovold <johan+linaro@...nel.org>,
 John Ogness <john.ogness@...utronix.de>, linux-arm-msm@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Stephen Boyd <swboyd@...omium.org>, linux-serial@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 Rob Herring <robh@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
Subject: Re: [PATCH v4 0/8] serial: qcom-geni: Overhaul TX handling to fix
 crashes/hangs



On 6/11/24 00:24, Douglas Anderson wrote:
> 
> While trying to reproduce -EBUSY errors that our lab was getting in
> suspend/resume testing, I ended up finding a whole pile of problems
> with the Qualcomm GENI serial driver. I've posted a fix for the -EBUSY
> issue separately [1]. This series is fixing all of the Qualcomm GENI
> problems that I found.
> 
> As far as I can tell most of the problems have been in the Qualcomm
> GENI serial driver since inception, but it can be noted that the
> behavior got worse with the new kfifo changes. Previously when the OS
> took data out of the circular queue we'd just spit stale data onto the
> serial port. Now we'll hard lockup. :-P
> 
> I've tried to break this series up as much as possible to make it
> easier to understand but the final patch is still a lot of change at
> once. Hopefully it's OK.

Tested-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad