[PATCH] swsusp: do not panic on bad signature with noresume

From:  Pavel Machek <pavel@ucw.cz>

  This patch makes kernel ignore bad signature on suspend device when
  "noresume" is given, and cleans things up a little bit. Please apply,

kernel/suspend.c

@@ -1084,12 +1084,12 @@ static int __read_suspend_image(struct block_device *bdev, union diskpage *cur,
 	else if (!memcmp("S2",cur->swh.magic.magic,2))
 		memcpy(cur->swh.magic.magic,"SWAPSPACE2",10);
 	else {
+		if (noresume)
+			return -EINVAL;
 		panic("%sUnable to find suspended-data signature (%.10s - misspelled?\n", 
 			name_resume, cur->swh.magic.magic);
-		/* We want to panic even with noresume -- we certainly don't want to add
-		   out signature into your ext2 filesystem ;-) */
 	}
-	if(noresume) {
+	if (noresume) {
 		/* We don't do a sanity check here: we want to restore the swap
 		   whatever version of kernel made the suspend image;
 		   We need to write swap, but swap is *not* enabled so
@@ -1207,11 +1207,11 @@ void software_resume(void)
 	/* We enable the possibility of machine suspend */
 	software_suspend_enabled = 1;
 #endif
-	if(!resume_status)
+	if (!resume_status)
 		return;
 
 	printk( "%s", name_resume );
-	if(resume_status == NORESUME) {
+	if (resume_status == NORESUME) {
 		if(resume_file[0])
 			read_suspend_image(resume_file, 1);
 		printk( "disabled\n" );
@@ -1240,7 +1240,7 @@ void software_resume(void)
 
 static int __init resume_setup(char *str)
 {
-	if(resume_status)
+	if (resume_status == NORESUME)
 		return 1;
 
 	strncpy( resume_file, str, 255 );
@@ -1249,16 +1249,13 @@ static int __init resume_setup(char *str)
 	return 1;
 }
 
-static int __init software_noresume(char *str)
+static int __init noresume_setup(char *str)
 {
-	if(!resume_status)
-		printk(KERN_WARNING "noresume option lacks a resume= option\n");
 	resume_status = NORESUME;
-	
 	return 1;
 }
 
-__setup("noresume", software_noresume);
+__setup("noresume", noresume_setup);
 __setup("resume=", resume_setup);
 
 EXPORT_SYMBOL(software_suspend);