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| author | Jesse Buhagiar <jooster669@gmail.com> | 2021-01-03 16:01:52 +1100 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2021-01-09 13:48:15 +0100 |
| commit | ff4afe17beee74d9130b5eae6fe407559fc5c90b (patch) | |
| tree | ad2575d8c4814d44de2387a88de9161ded7bb727 /Kernel/Devices/USB | |
| parent | 770a729e597702c0a32855b73dfc11fd8469316e (diff) | |
| download | serenity-ff4afe17beee74d9130b5eae6fe407559fc5c90b.zip | |
Kernel/USB: Ignore shared IRQs
According the USB spec/UHCI datasheet (as well as the Linux and
BSD source code), if we receive an IRQ and USBSTS is 0, then
the IRQ does not belong to us and we should immediately jump
out of the handler.
Diffstat (limited to 'Kernel/Devices/USB')
| -rw-r--r-- | Kernel/Devices/USB/UHCIController.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Kernel/Devices/USB/UHCIController.cpp b/Kernel/Devices/USB/UHCIController.cpp index 0d82f7e702..dd6a95ab6c 100644 --- a/Kernel/Devices/USB/UHCIController.cpp +++ b/Kernel/Devices/USB/UHCIController.cpp @@ -395,6 +395,10 @@ void UHCIController::spawn_port_proc() void UHCIController::handle_irq(const RegisterState&) { + // Shared IRQ. Not ours! + if(!read_usbsts()) + return; + klog() << "UHCI: Interrupt happened!"; klog() << "Value of USBSTS: " << read_usbsts(); } |