x86: 32bit numa srat fix early_ioremap leak

on two node system (16g RAM) with numa config I got this crash:

get_memcfg_from_srat: assigning address to rsdp
RSD PTR  v0 [ACPIAM]
ACPI: Too big length in RSDT: 92
failed to get NUMA memory information from SRAT table
NUMA - single node, flat memory mode
Node: 0, start_pfn: 0, end_pfn: 153
 Setting physnode_map array to node 0 for pfns:
 0
...
Pid: 0, comm: swapper Not tainted 2.6.26-rc4 #4
 [<80b41289>] hlt_loop+0x0/0x3
 [<8011efa0>] ? alloc_remap+0x50/0x70
 [<8079e32e>] alloc_node_mem_map+0x5e/0xa0
 [<8012e77b>] ? printk+0x1b/0x20
 [<80b590f6>] free_area_init_node+0xc6/0x470
 [<80b588fc>] ? __alloc_bootmem_node+0x2c/0x50
 [<80b58ad8>] ? find_min_pfn_for_node+0x38/0x70
 [<8012e77b>] ? printk+0x1b/0x20
 [<80b597c4>] free_area_init_nodes+0x254/0x2d0
 [<80b544d7>] zone_sizes_init+0x97/0xa0
 [<80b48a03>] setup_arch+0x383/0x530
 [<8012e77b>] ? printk+0x1b/0x20
 [<80b41aa4>] start_kernel+0x64/0x350
 [<80b412d8>] i386_start_kernel+0x8/0x10
 =======================

this patch increases the acpi table limit to 32.
Also match early_ioremap() with early_iounmap().

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 26 insertions, 11 deletions

diff --git a/arch/x86/kernel/srat_32.c b/arch/x86/kernel/srat_32.c
index 70e4a374b4e8..88971ee166d4 100644
--- a/arch/x86/kernel/srat_32.c
+++ b/arch/x86/kernel/srat_32.c
@@ -261,7 +261,7 @@ out_fail:
 
 struct acpi_static_rsdt {
         struct acpi_table_rsdt table;
-        u32 padding[7]; /* Allow for 7 more table entries */
+        u32 padding[32]; /* Allow for 32 more table entries */
 };
 
 int __init get_memcfg_from_srat(void)
@@ -297,7 +297,7 @@ int __init get_memcfg_from_srat(void)
         }
 
         rsdt = (struct acpi_table_rsdt *)
-            early_ioremap(rsdp->rsdt_physical_address, sizeof(struct acpi_table_rsdt));
+            early_ioremap(rsdp->rsdt_physical_address, sizeof(saved_rsdt));
 
         if (!rsdt) {
                 printk(KERN_WARNING
@@ -310,6 +310,7 @@ int __init get_memcfg_from_srat(void)
 
         if (strncmp(header->signature, ACPI_SIG_RSDT, strlen(ACPI_SIG_RSDT))) {
                 printk(KERN_WARNING "ACPI: RSDT signature incorrect\n");
+                early_iounmap(rsdt, sizeof(saved_rsdt));
                 goto out_err;
         }
 
@@ -319,37 +320,51 @@ int __init get_memcfg_from_srat(void)
          * size of RSDT) divided by the size of each entry
          * (4-byte table pointers).
          */
-        tables = (header->length - sizeof(struct acpi_table_header)) / 4;
+        tables = (header->length - sizeof(struct acpi_table_header)) / sizeof(u32);
 
         if (!tables)
                 goto out_err;
 
         memcpy(&saved_rsdt, rsdt, sizeof(saved_rsdt));
-
+        early_iounmap(rsdt, sizeof(saved_rsdt));
         if (saved_rsdt.table.header.length > sizeof(saved_rsdt)) {
                 printk(KERN_WARNING "ACPI: Too big length in RSDT: %d\n",
                        saved_rsdt.table.header.length);
                 goto out_err;
         }
 
-        printk("Begin SRAT table scan....\n");
+        printk("Begin SRAT table scan....%d\n", tables);
 
-        for (i = 0; i < tables; i++) {
+        for (i = 0; i < tables; i++){
+                int result;
+                u32 length;
                 /* Map in header, then map in full table length. */
                 header = (struct acpi_table_header *)
                         early_ioremap(saved_rsdt.table.table_offset_entry[i], sizeof(struct acpi_table_header));
                 if (!header)
                         break;
+
+                printk(KERN_INFO "ACPI: %4.4s %08lX, %04X\n",
+                           header->signature,
+                   (unsigned long)saved_rsdt.table.table_offset_entry[i],
+                           header->length);
+
+                if (strncmp((char *) &header->signature, ACPI_SIG_SRAT, 4)) {
+                        early_iounmap(header, sizeof(struct acpi_table_header));
+                        continue;
+                }
+
+                length = header->length;
+                early_iounmap(header, sizeof(struct acpi_table_header));
                 header = (struct acpi_table_header *)
-                        early_ioremap(saved_rsdt.table.table_offset_entry[i], header->length);
+                        early_ioremap(saved_rsdt.table.table_offset_entry[i], length);
                 if (!header)
                         break;
 
-                if (strncmp((char *) &header->signature, ACPI_SIG_SRAT, 4))
-                        continue;
-
                 /* we've found the srat table. don't need to look at any more tables */
-                return acpi20_parse_srat((struct acpi_table_srat *)header);
+                result = acpi20_parse_srat((struct acpi_table_srat *)header);
+                early_iounmap(header, length);
+                return result;
         }
 out_err:
         remove_all_active_ranges();