linux-kernel - Re: [PATCH v1 1/1] tty: serial: add missing spin_lock

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Date:   Wed, 13 May 2020 08:59:38 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     sagar.kadam@...ive.com, linux-serial@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, Atish Patra <Atish.Patra@....com>,
        Anup Patel <Anup.Patel@....com>
Subject: Re: [PATCH v1 1/1] tty: serial: add missing spin_lock_init for
 SiFive serial console

On Tue, May 12, 2020 at 04:00:23PM -0700, Palmer Dabbelt wrote:
> On Sat, 09 May 2020 03:24:12 PDT (-0700), sagar.kadam@...ive.com wrote:
> > An uninitialised spin lock for sifive serial console raises a bad
> > magic spin_lock error as reported and discussed here [1].
> > Initialising the spin lock resolves the issue.
> > 
> > The fix is tested on HiFive Unleashed A00 board with Linux 5.7-rc4
> > and OpenSBI v0.7
> > 
> > [1] https://lore.kernel.org/linux-riscv/b9fe49483a903f404e7acc15a6efbef756db28ae.camel@wdc.com
> > 
> > Fixes: 45c054d0815b ("tty: serial: add driver for the SiFive UART")
> > Reported-by: Atish Patra <Atish.Patra@....com>
> > Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@...ive.com>
> > ---
> >  drivers/tty/serial/sifive.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
> > index 13eadcb..0b5110d 100644
> > --- a/drivers/tty/serial/sifive.c
> > +++ b/drivers/tty/serial/sifive.c
> > @@ -883,6 +883,7 @@ console_initcall(sifive_console_init);
> > 
> >  static void __ssp_add_console_port(struct sifive_serial_port *ssp)
> >  {
> > +	spin_lock_init(&ssp->port.lock);
> >  	sifive_serial_console_ports[ssp->port.line] = ssp;
> >  }
> 
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> 
> I'm assuming it's going in through Greg's tree.

Sure, I'll be glad to take it.

greg k-h