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path: root/drivers/acpi/tables.c
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Diffstat (limited to 'drivers/acpi/tables.c')
-rw-r--r--drivers/acpi/tables.c76
1 files changed, 66 insertions, 10 deletions
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index d7bf936b1646..3b5d04fd5e3e 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -49,6 +49,16 @@ static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
static int acpi_apic_instance __initdata;
+enum acpi_subtable_type {
+ ACPI_SUBTABLE_COMMON,
+ ACPI_SUBTABLE_HMAT,
+};
+
+struct acpi_subtable_entry {
+ union acpi_subtable_headers *hdr;
+ enum acpi_subtable_type type;
+};
+
/*
* Disable table checksum verification for the early stage due to the size
* limitation of the current x86 early mapping implementation.
@@ -217,6 +227,50 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
}
}
+static unsigned long __init
+acpi_get_entry_type(struct acpi_subtable_entry *entry)
+{
+ switch (entry->type) {
+ case ACPI_SUBTABLE_COMMON:
+ return entry->hdr->common.type;
+ case ACPI_SUBTABLE_HMAT:
+ return entry->hdr->hmat.type;
+ }
+ return 0;
+}
+
+static unsigned long __init
+acpi_get_entry_length(struct acpi_subtable_entry *entry)
+{
+ switch (entry->type) {
+ case ACPI_SUBTABLE_COMMON:
+ return entry->hdr->common.length;
+ case ACPI_SUBTABLE_HMAT:
+ return entry->hdr->hmat.length;
+ }
+ return 0;
+}
+
+static unsigned long __init
+acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
+{
+ switch (entry->type) {
+ case ACPI_SUBTABLE_COMMON:
+ return sizeof(entry->hdr->common);
+ case ACPI_SUBTABLE_HMAT:
+ return sizeof(entry->hdr->hmat);
+ }
+ return 0;
+}
+
+static enum acpi_subtable_type __init
+acpi_get_subtable_type(char *id)
+{
+ if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
+ return ACPI_SUBTABLE_HMAT;
+ return ACPI_SUBTABLE_COMMON;
+}
+
/**
* acpi_parse_entries_array - for each proc_num find a suitable subtable
*
@@ -245,8 +299,8 @@ static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
struct acpi_subtable_proc *proc, int proc_num,
unsigned int max_entries)
{
- struct acpi_subtable_header *entry;
- unsigned long table_end;
+ struct acpi_subtable_entry entry;
+ unsigned long table_end, subtable_len, entry_len;
int count = 0;
int errs = 0;
int i;
@@ -269,19 +323,20 @@ static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
/* Parse all entries looking for a match. */
- entry = (struct acpi_subtable_header *)
+ entry.type = acpi_get_subtable_type(id);
+ entry.hdr = (union acpi_subtable_headers *)
((unsigned long)table_header + table_size);
+ subtable_len = acpi_get_subtable_header_length(&entry);
- while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
- table_end) {
+ while (((unsigned long)entry.hdr) + subtable_len < table_end) {
if (max_entries && count >= max_entries)
break;
for (i = 0; i < proc_num; i++) {
- if (entry->type != proc[i].id)
+ if (acpi_get_entry_type(&entry) != proc[i].id)
continue;
if (!proc[i].handler ||
- (!errs && proc[i].handler(entry, table_end))) {
+ (!errs && proc[i].handler(entry.hdr, table_end))) {
errs++;
continue;
}
@@ -296,13 +351,14 @@ static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
* If entry->length is 0, break from this loop to avoid
* infinite loop.
*/
- if (entry->length == 0) {
+ entry_len = acpi_get_entry_length(&entry);
+ if (entry_len == 0) {
pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
return -EINVAL;
}
- entry = (struct acpi_subtable_header *)
- ((unsigned long)entry + entry->length);
+ entry.hdr = (union acpi_subtable_headers *)
+ ((unsigned long)entry.hdr + entry_len);
}
if (max_entries && count > max_entries) {