ACPI, APEI, EINJ Allow empty Trigger Error Action Table

According to the ACPI spec [1] section 18.6.4 the TRIGGER_ERROR action
table can consists of zero elements.

[1] Advanced Configuration and Power Interface Specification
    Revision 5.0, December 6, 2011
	http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf

Signed-off-by: Niklas Söderlund <niklas.soderlund@ericsson.com>
Acked-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 5b898d4dda99..bb20b03ddc39 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -276,7 +276,7 @@ static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
         if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
                 return -EINVAL;
         if (trigger_tab->table_size > PAGE_SIZE ||
-            trigger_tab->table_size <= trigger_tab->header_size)
+            trigger_tab->table_size < trigger_tab->header_size)
                 return -EINVAL;
         if (trigger_tab->entry_count !=
             (trigger_tab->table_size - trigger_tab->header_size) /
@@ -340,6 +340,11 @@ static int __einj_error_trigger(u64 trigger_paddr, u32 type,
                            "The trigger error action table is invalid\n");
                 goto out_rel_header;
         }
+
+        /* No action structures in the TRIGGER_ERROR table, nothing to do */
+        if (!trigger_tab->entry_count)
+                goto out_rel_header;
+
         rc = -EIO;
         table_size = trigger_tab->table_size;
         r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),