linux-kernel - Re: [PATCH RFC v2 04/11] tty: xuartps: Remove bogus comment and register write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e074f376-9565-422e-abee-fdaa031239a1@TX2EHSMHS043.ehs.local>
Date:	Fri, 7 Mar 2014 15:08:00 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
CC:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Arnd Bergmann <arnd@...db.de>,
	Michal Simek <michal.simek@...inx.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-serial@...r.kernel.org>
Subject: Re: [PATCH RFC v2 04/11] tty: xuartps: Remove bogus comment and
 register write

On Fri, 2014-03-07 at 09:28PM +0000, One Thousand Gnomes wrote:
> On Fri,  7 Mar 2014 11:13:27 -0800
> Soren Brinkmann <soren.brinkmann@...inx.com> wrote:
> 
> > Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> > ---
> >  drivers/tty/serial/xilinx_uartps.c | 6 +-----
> >  1 file changed, 1 insertion(+), 5 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> > index a4bd6242e72d..a39c2d290902 100644
> > --- a/drivers/tty/serial/xilinx_uartps.c
> > +++ b/drivers/tty/serial/xilinx_uartps.c
> > @@ -1082,11 +1082,7 @@ static void xuartps_console_write(struct console *co, const char *s,
> >  
> >  	xuartps_writel(ctrl, XUARTPS_CR_OFFSET);
> >  
> > -	/* restore interrupt state, it seems like there may be a h/w bug
> > -	 * in that the interrupt enable register should not need to be
> > -	 * written based on the data sheet
> > -	 */
> > -	xuartps_writel(~imr, XUARTPS_IDR_OFFSET);
> > +	/* restore interrupt state */
> 
> It would be appropriate for the changelog at least to explain why the
> note about the data sheet differing is going away !

I don't know why anybody ever thought things are broken. IMHO, the
comment does not make any sense. Why would it not be required to write
the enable register when you enable interrupts?
I think someone read the data sheet wrong.

	Sören


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/