Merge tag 'pci-v4.12-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...

[karo-tx-linux.git] / drivers / acpi / acpica / tbutils.c

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 5a968a78652bd23d269fbc871957a4488fb03af6..0d2e98920069cf97ee323c8f9c3df543f8d6407a 100644 (file)
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -416,13 +416,18 @@ acpi_tb_get_table(struct acpi_table_desc *table_desc,
                }
        }
 
-       table_desc->validation_count++;
-       if (table_desc->validation_count == 0) {
-               ACPI_ERROR((AE_INFO,
-                           "Table %p, Validation count is zero after increment\n",
-                           table_desc));
-               table_desc->validation_count--;
-               return_ACPI_STATUS(AE_LIMIT);
+       if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+               table_desc->validation_count++;
+
+               /*
+                * Detect validation_count overflows to ensure that the warning
+                * message will only be printed once.
+                */
+               if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+                       ACPI_WARNING((AE_INFO,
+                                     "Table %p, Validation count overflows\n",
+                                     table_desc));
+               }
        }
 
        *out_table = table_desc->pointer;
@@ -449,13 +454,20 @@ void acpi_tb_put_table(struct acpi_table_desc *table_desc)
 
        ACPI_FUNCTION_TRACE(acpi_tb_put_table);
 
-       if (table_desc->validation_count == 0) {
-               ACPI_WARNING((AE_INFO,
-                             "Table %p, Validation count is zero before decrement\n",
-                             table_desc));
-               return_VOID;
+       if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
+               table_desc->validation_count--;
+
+               /*
+                * Detect validation_count underflows to ensure that the warning
+                * message will only be printed once.
+                */
+               if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
+                       ACPI_WARNING((AE_INFO,
+                                     "Table %p, Validation count underflows\n",
+                                     table_desc));
+                       return_VOID;
+               }
        }
-       table_desc->validation_count--;
 
        if (table_desc->validation_count == 0) {