Re: [PATCH v2 2/4] serial: sh-sci: Stop transfers in sci_shutdown()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Sat, Jun 25, 2016 at 09:09:39AM -0700, Greg Kroah-Hartman wrote:
> On Fri, Jun 24, 2016 at 04:59:14PM +0200, Geert Uytterhoeven wrote:
> > Make sure the transmitter and receiver are stopped when shutting down
> > the port, and related interrupts are disabled.
> > 
> > Without this:
> >   - New input data may be received into the RX FIFO, possibly
> >     triggering a new RX DMA completion,
> >   - Transfers will still be enabled on a subsequent startup of the UART,
> >     before the UART's FIFOs have been reset, causing reading of stale
> >     data.
> > 
> > Inspired by a patch in the BSP by Koji Matsuoka
> > <koji.matsuoka.xm@renesas.com>.
> > 
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> > ---
> > v2:
> >   - Do not clear clock source bits, since the serial console relies on
> >     them, as reported by Shimoda-san.
> > 
> > v1 was extracted from "[PATCH/RFC v3 0/4] serial: sh-sci: Add DT DMA
> > support".  The issues with the serial console seen before on
> > r8a7740/armadillo and sh73a0/kzm9g seem to be gone.  Changes after
> > resurrection:
> >   - Write zero to also disable related interrupts, as suggested by
> >     Laurent Pinchart,
> >   - Enhanced patch description.
> > ---
> >  drivers/tty/serial/sh-sci.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> 
> This patch does not apply to my tree :(

But I don't have access to my 2-factor token for about 24 hours, so my
tree will not be public until after then, sorry about that, I'll email
you when it gets synced up to kernel.org...

greg k-h