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authorAdrian Huang <adrian.huang@hp.com>2012-12-15 03:30:07 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-01-03 16:10:20 +0400
commit6780aa683d4d83ed887dd07b7987947d339d76f1 (patch)
treeaacc6936e42d2cd73a98439987c3b7efa361eed4 /drivers/acpi/apei
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff)
downloadlinux-6780aa683d4d83ed887dd07b7987947d339d76f1.tar.xz
ACPI / APEI: Fix the returned value in erst_dbg_read
If the persistent store is empty initially, the function 'erst_dbg_read' returns a nonzero value. The better way is to return a zero indicating the read operation reaches EOF. Tested on two different servers. Signed-off-by: Adrian Huang <adrian.huang@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/apei')
-rw-r--r--drivers/acpi/apei/erst-dbg.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
index 903549df809b..04ab5c9d3ced 100644
--- a/drivers/acpi/apei/erst-dbg.c
+++ b/drivers/acpi/apei/erst-dbg.c
@@ -111,8 +111,17 @@ retry_next:
if (rc)
goto out;
/* no more record */
- if (id == APEI_ERST_INVALID_RECORD_ID)
+ if (id == APEI_ERST_INVALID_RECORD_ID) {
+ /*
+ * If the persistent store is empty initially, the function
+ * 'erst_read' below will return "-ENOENT" value. This causes
+ * 'retry_next' label is entered again. The returned value
+ * should be zero indicating the read operation is EOF.
+ */
+ len = 0;
+
goto out;
+ }
retry:
rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len);
/* The record may be cleared by others, try read next record */