PM: Fix oops in suspend/hibernate code related to failing ioremap()

When ioremap() fails (which might happen for some reason), we nicely
oops in suspend_nvs_save() due to NULL dereference by memcpy() in there.
Fail gracefully instead.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 26697514c5ec..acb7d911bb0c 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -262,7 +262,7 @@ static inline bool system_entering_hibernation(void) { return false; }
 extern int suspend_nvs_register(unsigned long start, unsigned long size);
 extern int suspend_nvs_alloc(void);
 extern void suspend_nvs_free(void);
-extern void suspend_nvs_save(void);
+extern int suspend_nvs_save(void);
 extern void suspend_nvs_restore(void);
 #else /* CONFIG_SUSPEND_NVS */
 static inline int suspend_nvs_register(unsigned long a, unsigned long b)
@@ -271,7 +271,7 @@ static inline int suspend_nvs_register(unsigned long a, unsigned long b)
 }
 static inline int suspend_nvs_alloc(void) { return 0; }
 static inline void suspend_nvs_free(void) {}
-static inline void suspend_nvs_save(void) {}
+static inline int suspend_nvs_save(void) {}
 static inline void suspend_nvs_restore(void) {}
 #endif /* CONFIG_SUSPEND_NVS */