PM / hibernate: Check the success of generating md5 digest before hibernation

Currently if get_e820_md5() fails, then it will hibernate nevertheless.
Actually the error code should be propagated to upper caller so that
the hibernation could be aware of the result and terminates the process
if md5 digest fails.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
index f8e3b668d20b9b2cde3ff31ed6131efbf7273b4a..e0de959ad02dbf959157cb5b5f9927993a269bf5 100644 (file)
--- a/arch/x86/power/hibernate_64.c
+++ b/arch/x86/power/hibernate_64.c
@@ -265,9 +265,9 @@ free_tfm:
        return ret;
 }
 
-static void hibernation_e820_save(void *buf)
+static int hibernation_e820_save(void *buf)
 {
-       get_e820_md5(e820_table_firmware, buf);
+       return get_e820_md5(e820_table_firmware, buf);
 }
 
 static bool hibernation_e820_mismatch(void *buf)
@@ -287,8 +287,9 @@ static bool hibernation_e820_mismatch(void *buf)
        return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
 }
 #else
-static void hibernation_e820_save(void *buf)
+static int hibernation_e820_save(void *buf)
 {
+       return 0;
 }
 
 static bool hibernation_e820_mismatch(void *buf)
@@ -333,9 +334,7 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
 
        rdr->magic = RESTORE_MAGIC;
 
-       hibernation_e820_save(rdr->e820_digest);
-
-       return 0;
+       return hibernation_e820_save(rdr->e820_digest);
 }
 
 /**