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[PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function

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From: Fu Wei <fu.wei@linaro.org>

This patch introduces acpi_unregister_irq function to free a
linux IRQ number<->GSI mapping by a given linux IRQ number.

Even we have successfully registered the GSI, when some error occurs, we
may need to unmap it for freeing the IRQ resource. But in some cases, we
only have IRQ, but not GSI.

This patch is the preparation for memory-mapped timer support in GTDT
driver.

Signed-off-by: Fu Wei <fu.wei@linaro.org>
---
 drivers/acpi/irq.c   | 10 ++++++++++
 include/linux/acpi.h |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
index 830299a..59de777 100644
--- a/drivers/acpi/irq.c
+++ b/drivers/acpi/irq.c
@@ -85,6 +85,16 @@ void acpi_unregister_gsi(u32 gsi)
 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 
 /**
+ * acpi_unregister_irq() - Free a linux IRQ number<->GSI mapping
+ * @irq: linux IRQ number
+ */
+void acpi_unregister_irq(int irq)
+{
+	irq_dispose_mapping(irq);
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_irq);
+
+/**
  * acpi_get_irq_source_fwhandle() - Retrieve fwhandle from IRQ resource source.
  * @source: acpi_resource_source to use for the lookup.
  *
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 4b5c146..728d1ed 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -336,6 +336,13 @@ extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
  */
 void acpi_unregister_gsi (u32 gsi);
 
+/*
+ * This function undoes the effect of one call to acpi_register_gsi().
+ * The irq should be the return value of acpi_register_gsi().
+ * If the irq is valid, free a linux IRQ number<->GSI mapping.
+ */
+void acpi_unregister_irq(int irq);
+
 struct pci_dev;
 
 int acpi_pci_irq_enable (struct pci_dev *dev);
-- 
2.9.3

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[PATCH v24 00/11] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function fu.wei@linaro.org - 2017-04-14 20:50 +0200
    Re: [PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function Mark Rutland <mark.rutland@arm.com> - 2017-04-18 18:00 +0200
      Re: [PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function Mark Rutland <mark.rutland@arm.com> - 2017-04-19 17:20 +0200
  [PATCH v24 02/11] clocksource: arm_arch_timer: refactor arch_timer_needs_probing fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 11/11] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei@linaro.org - 2017-04-14 20:50 +0200
    Re: [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-18 19:30 +0200
      Re: [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-19 17:10 +0200
        Re: [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-19 17:50 +0200
          Re: [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-19 18:00 +0200
  [PATCH v24 03/11] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 07/11] clocksource: arm_arch_timer: simplify ACPI support code. fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 05/11] clocksource: arm_arch_timer: split MMIO timer probing. fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 10/11] clocksource: arm_arch_timer: add GTDT support for memory-mapped timer fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 06/11] acpi/arm64: Add GTDT table parse driver fu.wei@linaro.org - 2017-04-14 20:50 +0200
  [PATCH v24 01/11] clocksource: arm_arch_timer: split dt-only rate handling fu.wei@linaro.org - 2017-04-14 20:50 +0200

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