linux-kernel - Re: [PATCH 2/4] serial: core: fix broken sysrq port unlock

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Date:   Tue, 2 Jun 2020 17:48:29 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH 2/4] serial: core: fix broken sysrq port unlock

On Tue, Jun 2, 2020 at 5:03 PM Johan Hovold <johan@...nel.org> wrote:
>
> Commit d6e1935819db ("serial: core: Allow processing sysrq at port
> unlock time") worked around a circular locking dependency by adding
> helpers used to defer sysrq processing to when the port lock was
> released.
>
> A later commit unfortunately converted these inline helpers to exported
> functions despite the fact that the unlock helper was restoring irq
> flags, something which needs to be done in the same function that saved
> them (e.g. on SPARC).

I'm not familiar with sparc, can you elaborate a bit what is ABI /
architecture lock implementation background?

-- 
With Best Regards,
Andy Shevchenko