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a3e4949998
The interrupt controller in the internal GPIO peripheral will sometimes generate spurious interrupts. If these are not properly acknowledged, the system will be held busy until reboot. These spurious interrupts are identified by the fact that there is no system IRQ number associated, since the interrupt line was never allocated. Although most prevalent on RTL839x, RTL838x SoCs have also displayed this behaviour. Reported-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> # DGS-1210-52 Reported-by: Birger Koblitz <mail@birger-koblitz.de> # Netgear GS724TP v2 Reported-by: Jan Hoffmann <jan@3e8.eu> # HPE 1920-16G Signed-off-by: Sander Vanheule <sander@svanheule.net>
31 lines
1.2 KiB
Diff
31 lines
1.2 KiB
Diff
realtek: clear spurious GPIO interrupts
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The interrupt controller in the internal GPIO peripheral will sometimes
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generate spurious interrupts. If these are not properly acknowledged, the
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system will be held busy until reboot. These spurious interrupts are identified
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by the fact that there is no system IRQ number associated, since the interrupt
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line was never allocated. Although most prevalent on RTL839x, RTL838x SoCs have
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also displayed this behaviour.
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Reported-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> # DGS-1210-52
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Reported-by: Birger Koblitz <mail@birger-koblitz.de> # Netgear GS724TP v2
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Reported-by: Jan Hoffmann <jan@3e8.eu> # HPE 1920-16G
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Signed-off-by: Sander Vanheule <sander@svanheule.net>
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---
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drivers/gpio/gpio-realtek-otto.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/drivers/gpio/gpio-realtek-otto.c
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+++ b/drivers/gpio/gpio-realtek-otto.c
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@@ -251,6 +251,10 @@ static void realtek_gpio_irq_handler(str
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port_pin_count = min(gc->ngpio - lines_done, 8U);
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for_each_set_bit(offset, &status, port_pin_count) {
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irq = irq_find_mapping(gc->irq.domain, offset + lines_done);
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+ if (unlikely(!irq)) {
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+ realtek_gpio_clear_isr(ctrl, lines_done / 8, BIT(offset));
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+ continue;
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+ }
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generic_handle_irq(irq);
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}
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}
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