ACPI fixes for 5.9-rc3

- Avoid redundant rounding to the page size in acpi_os_map_iomem()
    to address a recently introduced issue with the EFI memory map
    permission check on ARM64 (Ard Biesheuvel).
 
  - Fix acpi_release_memory() to wait until the memory mappings
    released by it have been really unmapped (Rafael Wysocki).
 
  - Make the ACPI driver for AMD SoCs (APD) check the return value
    of acpi_dev_get_property() to avoid failures in the cases when the
    device property under inspection is missing (Furquan Shaikh).
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Merge tag 'acpi-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix two recent issues in the ACPI memory mappings management
  code and tighten up error handling in the ACPI driver for AMD SoCs
  (APD).

  Specifics:

   - Avoid redundant rounding to the page size in acpi_os_map_iomem() to
     address a recently introduced issue with the EFI memory map
     permission check on ARM64 (Ard Biesheuvel).

   - Fix acpi_release_memory() to wait until the memory mappings
     released by it have been really unmapped (Rafael Wysocki).

   - Make the ACPI driver for AMD SoCs (APD) check the return value of
     acpi_dev_get_property() to avoid failures in the cases when the
     device property under inspection is missing (Furquan Shaikh)"

* tag 'acpi-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: OSL: Prevent acpi_release_memory() from returning too early
  ACPI: ioremap: avoid redundant rounding to OS page size
  ACPI: SoC: APD: Check return value of acpi_dev_get_property()

drivers/acpi/acpi_apd.c

@@ -99,8 +99,8 @@ static int fch_misc_setup(struct apd_private_data *pdata)
 	if (ret < 0)
 		return -ENOENT;
 
-	acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj);
-	clk_data->is_rv = obj->integer.value;
+	if (!acpi_dev_get_property(adev, "is-rv", ACPI_TYPE_INTEGER, &obj))
+		clk_data->is_rv = obj->integer.value;
 
 	list_for_each_entry(rentry, &resource_list, node) {
 		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,

drivers/acpi/osl.c

@@ -350,7 +350,7 @@ void __iomem __ref
 
 	pg_off = round_down(phys, PAGE_SIZE);
 	pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
-	virt = acpi_map(pg_off, pg_sz);
+	virt = acpi_map(phys, size);
 	if (!virt) {
 		mutex_unlock(&acpi_ioremap_lock);
 		kfree(map);
@@ -358,7 +358,7 @@ void __iomem __ref
 	}
 
 	INIT_LIST_HEAD(&map->list);
-	map->virt = virt;
+	map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
 	map->phys = pg_off;
 	map->size = pg_sz;
 	map->track.refcount = 1;
@@ -1575,11 +1575,26 @@ static acpi_status acpi_deactivate_mem_region(acpi_handle handle, u32 level,
 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res,
 				u32 level)
 {
+	acpi_status status;
+
 	if (!(res->flags & IORESOURCE_MEM))
 		return AE_TYPE;
 
-	return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
-				   acpi_deactivate_mem_region, NULL, res, NULL);
+	status = acpi_walk_namespace(ACPI_TYPE_REGION, handle, level,
+				     acpi_deactivate_mem_region, NULL,
+				     res, NULL);
+	if (ACPI_FAILURE(status))
+		return status;
+
+	/*
+	 * Wait for all of the mappings queued up for removal by
+	 * acpi_deactivate_mem_region() to actually go away.
+	 */
+	synchronize_rcu();
+	rcu_barrier();
+	flush_scheduled_work();
+
+	return AE_OK;
 }
 EXPORT_SYMBOL_GPL(acpi_release_memory);