x86/amd-iommu: Report errors in acpi parsing functions upstream

Since acpi_table_parse ignores the return values of the
parsing function this patch introduces a workaround and
reports these errors upstream via a global variable.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 9dc91b4..feaf471 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -138,9 +138,9 @@ int amd_iommus_present;
 bool amd_iommu_np_cache __read_mostly;
 
 /*
- * Set to true if ACPI table parsing and hardware intialization went properly
+ * The ACPI table parsing functions set this variable on an error
  */
-static bool amd_iommu_initialized;
+static int __initdata amd_iommu_init_err;
 
 /*
  * List of protection domains - used during resume
@@ -391,9 +391,11 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table)
         */
        for (i = 0; i < table->length; ++i)
                checksum += p[i];
-       if (checksum != 0)
+       if (checksum != 0) {
                /* ACPI table corrupt */
-               return -ENODEV;
+               amd_iommu_init_err = -ENODEV;
+               return 0;
+       }
 
        p += IVRS_HEADER_LENGTH;
 
@@ -920,11 +922,16 @@ static int __init init_iommu_all(struct acpi_table_header *table)
                                    h->mmio_phys);
 
                        iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
-                       if (iommu == NULL)
-                               return -ENOMEM;
+                       if (iommu == NULL) {
+                               amd_iommu_init_err = -ENOMEM;
+                               return 0;
+                       }
+
                        ret = init_iommu_one(iommu, h);
-                       if (ret)
-                               return ret;
+                       if (ret) {
+                               amd_iommu_init_err = ret;
+                               return 0;
+                       }
                        break;
                default:
                        break;
@@ -934,8 +941,6 @@ static int __init init_iommu_all(struct acpi_table_header *table)
        }
        WARN_ON(p != end);
 
-       amd_iommu_initialized = true;
-
        return 0;
 }
 
@@ -1211,6 +1216,10 @@ static int __init amd_iommu_init(void)
        if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0)
                return -ENODEV;
 
+       ret = amd_iommu_init_err;
+       if (ret)
+               goto out;
+
        dev_table_size     = tbl_size(DEV_TABLE_ENTRY_SIZE);
        alias_table_size   = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
        rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
@@ -1270,12 +1279,19 @@ static int __init amd_iommu_init(void)
        if (acpi_table_parse("IVRS", init_iommu_all) != 0)
                goto free;
 
-       if (!amd_iommu_initialized)
+       if (amd_iommu_init_err) {
+               ret = amd_iommu_init_err;
                goto free;
+       }
 
        if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
                goto free;
 
+       if (amd_iommu_init_err) {
+               ret = amd_iommu_init_err;
+               goto free;
+       }
+
        ret = sysdev_class_register(&amd_iommu_sysdev_class);
        if (ret)
                goto free;