[PATCH] PM/sleep: fix return value of __setup handler

[Randy Dunlap]

If an invalid option is given for "test_suspend=<option>", the entire
string is added to init's environment, so return 1 instead of 0 from
the __setup handler.

  Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc5
    test_suspend=invalid"

and

 Run /sbin/init as init process
   with arguments:
     /sbin/init
   with environment:
     HOME=/
     TERM=linux
     BOOT_IMAGE=/boot/bzImage-517rc5
     test_suspend=invalid

Fixes: 2ce986892faf ("PM / sleep: Enhance test_suspend option with repeat capability")
Fixes: 27ddcc6596e5 ("PM / sleep: Add state field to pm_states[] entries")
Fixes: a9d7052363a6 ("PM: Separate suspend to RAM functionality from core")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: Igor Zhbanov <i.zhbanov@xxxxxxxxxxxx>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@xxxxxxxxxxxx
Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
---
Would someone like warning messages added in case of bad option strings?

 kernel/power/suspend_test.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- linux-next-20220228.orig/kernel/power/suspend_test.c
+++ linux-next-20220228/kernel/power/suspend_test.c
@@ -157,22 +157,22 @@ static int __init setup_test_suspend(cha
 	value++;
 	suspend_type = strsep(&value, ",");
 	if (!suspend_type)
-		return 0;
+		return 1;
 
 	repeat = strsep(&value, ",");
 	if (repeat) {
 		if (kstrtou32(repeat, 0, &test_repeat_count_max))
-			return 0;
+			return 1;
 	}
 
 	for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
 		if (!strcmp(pm_labels[i], suspend_type)) {
 			test_state_label = pm_labels[i];
-			return 0;
+			return 1;
 		}
 
 	printk(warn_bad_state, suspend_type);
-	return 0;
+	return 1;
 }
 __setup("test_suspend", setup_test_suspend);