On 2 January 2016 at 03:10, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki
>
> Add kerneldoc comments to acpi_os_map_iomem() and acpi_os_unmap_iomem()
> and explain why the latter needs the __ref annotation in one of them
> (as suggested by Mathias Krause).
>
> Signed-off-by: Rafael J. Wysocki
> ---
> drivers/acpi/osl.c | 27 +++
> 1 file changed, 27 insertions(+)
>
> Index: linux-pm/drivers/acpi/osl.c
> ===
> --- linux-pm.orig/drivers/acpi/osl.c
> +++ linux-pm/drivers/acpi/osl.c
> @@ -366,6 +366,19 @@ static void acpi_unmap(acpi_physical_add
> iounmap(vaddr);
> }
>
> +/**
> + * acpi_os_map_iomem - Get a virtual address for a given physical address
> range.
> + * @phys: Start of the physical address range to map.
> + * @size: Size of the physical address range to map.
> + *
> + * Look up the given physical address range in the list of existing ACPI
> memory
> + * mappings. If found, get a reference to it and return a pointer to it (its
> + * virtual address). If not found, map it, add it to that list and return a
> + * pointer to it.
> + *
> + * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
> + * routine simply calls __acpi_map_table() to get the job done.
> + */
> void __iomem *__init_refok
> acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
> {
> @@ -441,6 +454,20 @@ static void acpi_os_map_cleanup(struct a
> }
> }
>
> +/**
> + * acpi_os_unmap_iomem - Drop a memory mapping reference.
> + * @virt: Start of the address range to drop a reference to.
> + * @size: Size of the address range to drop a reference to.
> + *
> + * Look up the given virtual address range in the list of existing ACPI
> memory
> + * mappings, drop a reference to it and unmap it if there are no more active
> + * references to it.
> + *
> + * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
> + * routine simply calls __acpi_unmap_table() to get the job done. Since
> + * __acpi_unmap_table() is an __init function, the __ref annotation is needed
> + * here.
> + */
> void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
> {
> struct acpi_ioremap *map;
>
Looks much better than my two-liner comment!
Acked-by: Mathias Krause
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