Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH v1 0/3] ACPI: OSL/EC: Use spin locks without disabling interrupts | Date | Fri, 15 Dec 2023 12:23:54 +0100 |
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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!
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