remove software_suspend()

Remove software_suspend() and all its users since
pm_suspend(PM_SUSPEND_DISK) should be equivalent and there's no point in
having two interfaces for the same thing.

The patch also changes the valid_state function to return 0 (false) for
PM_SUSPEND_DISK when SOFTWARE_SUSPEND is not configured instead of
accepting it and having the whole thing fail later.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 13 insertions, 26 deletions

diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 2d912b71e543..dcde9ddd105a 100644
--- a/drivers/acpi/sleep/proc.c
+++ b/drivers/acpi/sleep/proc.c
@@ -60,7 +60,7 @@ acpi_system_write_sleep(struct file *file,
         state = simple_strtoul(str, NULL, 0);
 #ifdef CONFIG_SOFTWARE_SUSPEND
         if (state == 4) {
-                error = software_suspend();
+                error = pm_suspend(PM_SUSPEND_DISK);
                 goto Done;
         }
 #endif
diff --git a/drivers/i2c/chips/tps65010.c b/drivers/i2c/chips/tps65010.c
index 214fbb1423c5..7ed92dc3d833 100644
--- a/drivers/i2c/chips/tps65010.c
+++ b/drivers/i2c/chips/tps65010.c
@@ -351,8 +351,10 @@ static void tps65010_interrupt(struct tps65010 *tps)
 #if 0
                         /* REVISIT:  this might need its own workqueue
                          * plus tweaks including deadlock avoidance ...
+                         * also needs to get error handling and probably
+                         * an #ifdef CONFIG_SOFTWARE_SUSPEND
                          */
-                        software_suspend();
+                        pm_suspend(PM_SUSPEND_DISK);
 #endif
                         poll = 1;
                 }
diff --git a/include/linux/init.h b/include/linux/init.h
index 9abf120ec9f8..dbbdbd1bec77 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -233,7 +233,7 @@ void __init parse_early_param(void);
 #define __obsolete_setup(str)                   /* nothing */
 #endif
 
-/* Data marked not to be saved by software_suspend() */
+/* Data marked not to be saved by software suspend */
 #define __nosavedata __attribute__ ((__section__ (".data.nosave")))
 
 /* This means "can be init if no module support, otherwise module load
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 3cc4d6394c07..3aecc96acc76 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -33,8 +33,6 @@ static inline void pm_restore_console(void) {}
 #endif
 
 #if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
-/* kernel/power/swsusp.c */
-extern int software_suspend(void);
 /* kernel/power/snapshot.c */
 extern void __init register_nosave_region(unsigned long, unsigned long);
 extern int swsusp_page_is_forbidden(struct page *);
@@ -42,12 +40,6 @@ extern void swsusp_set_page_free(struct page *);
 extern void swsusp_unset_page_free(struct page *);
 extern unsigned long get_safe_page(gfp_t gfp_mask);
 #else
-static inline int software_suspend(void)
-{
-        printk("Warning: fake suspend called\n");
-        return -ENOSYS;
-}
-
 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 static inline void swsusp_set_page_free(struct page *p) {}
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 5a779270cdbc..f6dda685e7e2 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -184,17 +184,21 @@ static void suspend_finish(suspend_state_t state)
 static const char * const pm_states[PM_SUSPEND_MAX] = {
         [PM_SUSPEND_STANDBY]    = "standby",
         [PM_SUSPEND_MEM]        = "mem",
-#ifdef CONFIG_SOFTWARE_SUSPEND
         [PM_SUSPEND_DISK]       = "disk",
-#endif
 };
 
 static inline int valid_state(suspend_state_t state)
 {
         /* Suspend-to-disk does not really need low-level support.
-         * It can work with reboot if needed. */
+         * It can work with shutdown/reboot if needed. If it isn't
+         * configured, then it cannot be supported.
+         */
         if (state == PM_SUSPEND_DISK)
+#ifdef CONFIG_SOFTWARE_SUSPEND
                 return 1;
+#else
+                return 0;
+#endif
 
         /* all other states need lowlevel support and need to be
          * valid to the lowlevel implementation, no valid callback
@@ -244,17 +248,6 @@ static int enter_state(suspend_state_t state)
         return error;
 }
 
-#ifdef CONFIG_SOFTWARE_SUSPEND
-/*
- * This is main interface to the outside world. It needs to be
- * called from process context.
- */
-int software_suspend(void)
-{
-        return enter_state(PM_SUSPEND_DISK);
-}
-#endif
-
 
 /**
  *      pm_suspend - Externally visible function for suspending system.
diff --git a/kernel/sys.c b/kernel/sys.c
index 123b165080e6..fe1f3ab20477 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -881,7 +881,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
 #ifdef CONFIG_SOFTWARE_SUSPEND
         case LINUX_REBOOT_CMD_SW_SUSPEND:
                 {
-                        int ret = software_suspend();
+                        int ret = pm_suspend(PM_SUSPEND_DISK);
                         unlock_kernel();
                         return ret;
                 }