target/linux/realtek/patches-5.10/317-gpio-realtek-otto-clear-spurious-interrups.patch

   1 realtek: clear spurious GPIO interrupts
   2
   3 The interrupt controller in the internal GPIO peripheral will sometimes
   4 generate spurious interrupts. If these are not properly acknowledged, the
   5 system will be held busy until reboot. These spurious interrupts are identified
   6 by the fact that there is no system IRQ number associated, since the interrupt
   7 line was never allocated. Although most prevalent on RTL839x, RTL838x SoCs have
   8 also displayed this behaviour.
   9
  10 Reported-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> # DGS-1210-52
  11 Reported-by: Birger Koblitz <mail@birger-koblitz.de> # Netgear GS724TP v2
  12 Reported-by: Jan Hoffmann <jan@3e8.eu> # HPE 1920-16G
  13 Signed-off-by: Sander Vanheule <sander@svanheule.net>
  14 ---
  15  drivers/gpio/gpio-realtek-otto.c |    4 ++++
  16  1 file changed, 4 insertions(+)
  17
  18 --- a/drivers/gpio/gpio-realtek-otto.c
  19 +++ b/drivers/gpio/gpio-realtek-otto.c
  20 @@ -251,6 +251,10 @@ static void realtek_gpio_irq_handler(str
  21                 port_pin_count = min(gc->ngpio - lines_done, 8U);
  22                 for_each_set_bit(offset, &status, port_pin_count) {
  23                         irq = irq_find_mapping(gc->irq.domain, offset + lines_done);
  24 +                       if (unlikely(!irq)) {
  25 +                               realtek_gpio_clear_isr(ctrl, lines_done / 8, BIT(offset));
  26 +                               continue;
  27 +                       }
  28                         generic_handle_irq(irq);
  29                 }
  30         }