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| author |   Yinghai Lu <yhlu.kernel@gmail.com> | 2009-02-07 15:39:41 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-02-09 13:35:07 +0100 |
| commit | 7d97277b754d3ee098a5ec69b6aaafb00c94e2f2 (patch) | |
| tree | 457ff6256a2da2f39f93500453a6a643ab29ef2b /drivers/acpi/osl.c | |
| parent | acpi: remove final __acpi_map_table mapping before setting acpi_gbl_permanent_mmap (diff) | |
| download | linux-dev-7d97277b754d3ee098a5ec69b6aaafb00c94e2f2.tar.xz linux-dev-7d97277b754d3ee098a5ec69b6aaafb00c94e2f2.zip | |
acpi/x86: introduce __apci_map_table, v4
to prevent wrongly overwriting fixmap that still want to use.
ACPI used to rely on low mappings being all linearly mapped and
grew a habit: it never really unmapped certain kinds of tables
after use.
This can cause problems - for example the hypothetical case
when some spurious access still references it.
v2: remove prev_map and prev_size in __apci_map_table
v3: let acpi_os_unmap_memory() call early_iounmap too, so remove extral calling to
early_acpi_os_unmap_memory
v4: fix typo in one acpi_get_table_with_size calling
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index b3193ec0a2ef..d1dd5160daa9 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -274,12 +274,19 @@ EXPORT_SYMBOL_GPL(acpi_os_map_memory); void acpi_os_unmap_memory(void __iomem * virt, acpi_size size) { - if (acpi_gbl_permanent_mmap) { + if (acpi_gbl_permanent_mmap) iounmap(virt); - } + else + __acpi_unmap_table(virt, size); } EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); +void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size) +{ + if (!acpi_gbl_permanent_mmap) + __acpi_unmap_table(virt, size); +} + #ifdef ACPI_FUTURE_USAGE acpi_status acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) |