linux-kernel - RE: [PATCH 1/1] tty: serial: samsung: add spin_lock for interrupt and console

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Message-ID: <004401d849a8$30b87d00$92297700$@samsung.com>
Date:   Wed, 6 Apr 2022 20:19:32 +0900
From:   "Jaewon Kim" <jaewon02.kim@...sung.com>
To:     "'Jiri Slaby'" <jirislaby@...nel.org>,
        "'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>
Cc:     "'Krzysztof Kozlowski'" <krzk@...nel.org>,
        "'Alim Akhtar'" <alim.akhtar@...sung.com>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "'Chanho Park'" <chanho61.park@...sung.com>
Subject: RE: [PATCH 1/1] tty: serial: samsung: add spin_lock for interrupt
 and console_write


On 22. 4. 6. 18:48, Jiri Slaby wrote:> On 06. 04. 22, 10:39, Jaewon Kim wrote:
> > On 22. 4. 6. 17:21, Greg Kroah-Hartman wrote:
> >> On Wed, Apr 06, 2022 at 05:22:16PM +0900, Jaewon Kim wrote:
> >>> The console_write and IRQ handler can run concurrently.
> >>> Problems may occurs console_write is continuously executed while the
> >>> IRQ handler is running.
> >>>
> >>> Signed-off-by: Jaewon Kim <jaewon02.kim@...sung.com>
> >>> ---
> >>>   drivers/tty/serial/samsung_tty.c | 12 ++++++++++++
> >>>   1 file changed, 12 insertions(+)
> >>>
> >>> diff --git a/drivers/tty/serial/samsung_tty.c
> >>> b/drivers/tty/serial/samsung_tty.c
> >>> index e1585fbae909..9db479d728b5 100644
> >>> --- a/drivers/tty/serial/samsung_tty.c
> >>> +++ b/drivers/tty/serial/samsung_tty.c
> >>> @@ -2480,12 +2480,24 @@ s3c24xx_serial_console_write(struct console *co, const char *s,
> >>>   			     unsigned int count)
> >>>   {
> >>>   	unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
> >>> +	unsigned long flags;
> >>> +	bool locked = 1;
> >>
> >> "1" is not a boolean :)
> >
> > return value of spin_trylock() is 1 or 0.
> > It seems better to keep it as an int than to change it to bool.
> > I will return it to int.
> 
> Hi, no, do not that. Simply use bool/true/false.
> 

Okay, Thanks to review.
I will fix 1 to bool in next v3 patch.

> thanks,
> --
> js
> suse labs

Thanks
Jaewon Kim