linux-kernel - Re: [PATCH] tty: serial: samsung_tty: remove spinlock flags in interrupt handlers

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Date:   Mon, 22 Mar 2021 12:23:49 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcan@...can.st, arnd@...nel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH] tty: serial: samsung_tty: remove spinlock flags in
 interrupt handlers

On Mon, Mar 15, 2021 at 07:12:12PM +0100, Krzysztof Kozlowski wrote:
> Since interrupt handler is called with disabled local interrupts, there
> is no need to use the spinlock primitives disabling interrupts as well.
> 
> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

Interrupts are now disabled also with forced interrupt threading even if
this never was an issue for this driver which currently doesn't take the
port lock in the console paths.

Reviewed-by: Johan Hovold <johan@...nel.org>

Johan