linux-kernel - Re: [PATCH RFC] tty, serial, 8250: remove __init from function serial8250_console

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Date:	Tue, 25 Nov 2014 23:18:33 +0100
From:	Arianna Avanzini <avanzini.arianna@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	jslaby@...e.cz, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH RFC] tty, serial, 8250: remove __init from function
 serial8250_console_setup()

On Tue, Nov 25, 2014 at 09:51:21AM -0800, Greg KH wrote:
> On Thu, Nov 20, 2014 at 07:00:56PM +0100, Arianna Avanzini wrote:
> > Some RS232 adapters handled by this driver are hotpluggable. The function
> > serial8250_console_setup() is called during device init and is defined with
> > the __init macro. In case the driver is built-in, hotplugging the device after
> > the initialization phase has been completed (and the related memory has been
> > freed) results in a kernel crash.
> > This commit fixes the issue by removing __init from the function definition.
> > 
> > Signed-off-by: Arianna Avanzini <avanzini.arianna@...il.com>
> > ---
> >  drivers/tty/serial/8250/8250_core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> > index ca5cfdc..ca8108d 100644
> > --- a/drivers/tty/serial/8250/8250_core.c
> > +++ b/drivers/tty/serial/8250/8250_core.c
> > @@ -3237,7 +3237,7 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
> >  	serial8250_rpm_put(up);
> >  }
> >  
> > -static int __init serial8250_console_setup(struct console *co, char *options)
> > +static int serial8250_console_setup(struct console *co, char *options)
> >  {
> >  	struct uart_port *port;
> >  	int baud = 9600;
> > -- 
> > 2.1.3
> 
> I don't apply "RFC" patches as it implies you don't even know if this
> works or not.

I was not aware of the fact that the "RFC" tag had such an implication; thank
you for pointing that out. As I have already tested the patch and it appears to
be effective, I'll resend it and drop the "RFC" tag.

Thank you,
Arianna


--
/*
 * Arianna Avanzini
 * avanzini.arianna@...il.com
 * http://ava.webhop.me
 */
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