From 4c40aed869a200a621b53bcb491c5ee8a34ef5f1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= Date: Mon, 9 Jan 2012 16:49:44 +0100 Subject: [PATCH] ACPI, APEI, EINJ Allow empty Trigger Error Action Table MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Acked-by: Huang Ying Signed-off-by: Len Brown --- drivers/acpi/apei/einj.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) 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),