Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Mon, 10 Jul 2023 09:03:19 +0200 | Subject | Re: [PATCH] [RFT] sh: mach-r2d: Handle virq offset in cascaded IRL demux |
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Hi Günter,
On Mon, Jul 10, 2023 at 3:13 AM Guenter Roeck <linux@roeck-us.net> wrote: > On 7/9/23 04:15, Geert Uytterhoeven wrote: > > When booting rts7751r2dplus_defconfig on QEMU, the system hangs due to > > an interrupt storm on IRQ 20. IRQ 20 aka event 0x280 is a cascaded IRL > > interrupt, which maps to IRQ_VOYAGER, the interrupt used by the Silicon > > Motion SM501 multimedia companion chip. As rts7751r2d_irq_demux() does > > not take into account the new virq offset, the interrupt is no longer > > translated, leading to an unhandled interrupt. > > > > Fix this by taking into account the virq offset when translating > > cascaded IRL interrupts. > > > > Fixes: a8ac2961148e8c72 ("sh: Avoid using IRQ0 on SH3 and SH4") > > Reported-by: Guenter Roeck <linux@roeck-us.net> > > Closes: https://lore.kernel.org/r/fbfea3ad-d327-4ad5-ac9c-648c7ca3fe1f@roeck-us.net > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > > --- > > Highlander and Dreamcast probably have the same issue. > > I'll send patches for these later... > > dreamcast doesn't build in linux-next, just in case you didn't notice.
Indeed, I hadn't tested that. My current tree isn't based on linux-next, but did have a build failure in the cdrom code, for which I had found your fix (thanks!) in linux-next...
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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