Re: [PATCH, RESEND] serial-uartlite: un-constify uartlite_be/uartlite_le

[Sudip Mukherjee]

On Sunday 17 April 2016 06:09 AM, Greg Kroah-Hartman wrote:
> On Sun, Apr 17, 2016 at 02:12:47AM +0200, Arnd Bergmann wrote:
> > The patch to make uartlite_be/uartlite_le const was well-intended but
> > caused a new build warning:
> >
> > tty/serial/uartlite.c: In function 'ulite_request_port':
> > tty/serial/uartlite.c:348:21: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> > tty/serial/uartlite.c:354:22: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> >
> > It would be nice to allow passing const pointers through
> > port->private_data, but that would be way more work, so this
> > reverts part of the original commit for now.
> >
> > A possible alternative might be to pass a structure in the private_data
> > that contains a const pointer to the operations, which introduces a little
> > extra overhead, or we could just add a cast to a non-const pointer, I'll
> > leave that to the maintainer.
> >
> > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> > Fixes: 2905697a82ea ("serial-uartlite: Constify uartlite_be/uartlite_le")
> > ---
> >   drivers/tty/serial/uartlite.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > I sent this patch on March 10, but it never made it in.
> >
> > Greg, could you apply the patch as a bugfix for 4.6? The warning is
> > annoying as it shows up in several defconfig builds and allmodconfig.
>
> Ugh, sorry about this, will get to it soon...

A revert patch with the same effect posted on 11th April is also in 
waiting. http://www.spinics.net/lists/linux-serial/msg22287.html

regards
sudip