On Wed, May 20, 2020 at 6:41 AM Finn Thain <[email protected]> wrote: > On a Quadra 900/950, the ISM IOP IRQ output pin is connected to an > edge-triggered input on VIA2. It is theoretically possible that this > signal could fail to produce the expected VIA2 interrupt. > > The two IOP interrupt flags can be asserted in any order but the logic > in iop_ism_irq() does not allow for that. In particular, INT0 can be > asserted right after INT0 is checked and before INT1 is cleared. > > Such an interrupt would produce no new edge and VIA2 would detect no > further interrupts from the IOP. Avoid this by looping over the INT0/1 > handlers so an edge can be produced. > > Cc: Joshua Thompson <[email protected]> > Tested-by: Stan Johnson <[email protected]> > Signed-off-by: Finn Thain <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]> i.e. will queue in the m68k for-v5.8 branch. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected] 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
