linux-kernel - Re: [RFC][PATCH] serial: amba-pl011: Make sure we initialize the port.lock spinlock

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Date:   Tue, 28 Apr 2020 09:54:38 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     John Stultz <john.stultz@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "open list\:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [RFC][PATCH] serial: amba-pl011: Make sure we initialize the port.lock spinlock


On 27/04/20 10:02, Andy Shevchenko wrote:
>> I did a tiny bit of git spelunking; I found a commit that changed
>> uart_console_enabled() into uart_console() within
>> uart_port_spin_lock_init():
>>
>>   a3cb39d258ef ("serial: core: Allow detach and attach serial device for console")
>>
>> Reverting just that one change in uart_port_spin_lock_init() seems to go
>> fine on both Juno & HiKey960, but I think that doesn't play well with the
>> rest of the aforementioned commit. I think that this initial (index, line)
>> tuple is to blame, though I've added Andy in Cc just in case.
>
> The above mentioned commit reveals the issue in the code which doesn't
> register console properly.
>
> See what I put in 0f87aa66e8c31 ("serial: sunhv: Initialize lock for
> non-registered console").

Thanks for the pointer. I'm still a puzzled as to why it goes fine on one
board and not on another, but at this point I don't have any better
suggestion than the unconditional init.