[PATCH] ARM: orion: provide C-style interrupt handler for MULTI_IRQ_HANDLER

[Ian Campbell]

On Thu, 2014-01-16 at 11:48 -0500, Jason Cooper wrote:
> Sebastian,
> 
> On Thu, Jan 16, 2014 at 09:10:31AM +0100, Sebastian Hesselbarth wrote:
> > DT-enabled Marvell Kirkwood and Dove SoCs make use of an irqchip
> > driver. As expected for irqchip drivers, it uses a C-style
> > interrupt handler and therefore selects MULTI_IRQ_HANDLER.
> > 
> > Now, compiling a kernel with both non-DT and DT support enabled,
> > selecting MULTI_IRQ_HANDLER will break ASM irq handler used by
> > non-DT boards.
> > 
> > Therefore, we provide a C-style irq handler even for non-DT boards,
> > if MULTI_IRQ_HANDLER is set. By installing the C-style irq handler
> > in orion_irq_init this is transparent to all non-DT board files.
> > 
> > While the regression report was filed on Marvell Kirkwood, also
> > Marvell Dove non-DT boards are affected and fixed by this patch.
> > 
> > Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
> > Tested-by: Ian Campbell <ijc at hellion.org.uk>
> > Reported-by: Ian Campbell <ijc at hellion.org.uk>
> > Fixes: 2326f04321a9 ("ARM: kirkwood: convert to DT irqchip and clocksource")
> > Fixes: f07d73e33d0e ("ARM: dove: convert to DT irqchip and clocksource")
> > ---
> > Compared to the two patch version sent on Ian's regression report,
> > I cooked this down to a single patch only touching plat-orion/irq.c.
> > I also dropped Orion5x and MV78x00, as they not yet select MULTI_IRQ_HANDLER
> > at all. Instead I added a comment about taking care of them, as soon as
> > they move over to an irqchip driver themselves.
> > 
> > I have not yet Cc'ed this patch to -stable to get some discussion and
> > an Acked-by from Jason or Andrew, too.
> > 
> > Cc: Jason Cooper <jason at lakedaemon.net>
> > Cc: Andrew Lunn <andrew at lunn.ch>
> > Cc: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
> > Cc: Russell King <linux at arm.linux.org.uk>
> > Cc: Ian Campbell <ijc at hellion.org.uk>
> > Cc: linux-arm-kernel at lists.infradead.org
> > Cc: linux-kernel at vger.kernel.org
> > ---
> >  arch/arm/plat-orion/irq.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 47 insertions(+)
> 
> Applied to mvebu/fixes with Andrew's Ack.  It's too late for v3.13, so
> it'll be the first thing sent for v3.14.

Please can it also be tagged for stable backport to 3.12+3.13.

Thanks,
Ian.