Hi Everyone, After https://patchwork.kernel.org/project/linux-acpi/patch/5745568.DvuYhMxLoT@kreacher/ the SCI interrupt handler is threaded, so ACPICA spin locks can be used without disabling interrupts, because they cannot be acquired from a hardirq handler running on the same CPU as any code already holding the spin lock. This patch [1/3] removes disabling interrupts from acpi_os_acquire_lock() and updates acpi_os_release_lock() accordingly. Patch [2/2] uses the observation that if acpi_handle_interrupt() can run in a threaded interrupt handler in the GPE case, it can also run in a threaded interrupt handler in the dedicated IRQ case, so it makes the EC driver use a threaded handler for the dedicated EC interrupt. Patch [3/3], in analogy with patch [1/3], uses the observation that after patch [2/2] all of the EC code runs in thread context, so it need not disable interrupts on the local CPU before acquiring a spin lock, so the EC driver is updated to operate its spin lock without disabling interrupts. Thanks!
