watchdog: diag288: Stop re-using watchdog core internal flags

A watchdog driver should not use watchdog subsystem internal flags.
Use a driver variable and flag instead to maintain the watchdog state
and to determine if a suspend operation is possible or not.

Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/diag288_wdt.c

···
 	return __diag288(func, timeout, action, 0);
 }
 
+static unsigned long wdt_status;
+
+#define DIAG_WDOG_BUSY	0
+
 static int wdt_start(struct watchdog_device *dev)
 {
 	char *ebc_cmd;
···
 	int ret;
 	unsigned int func;
 
+	if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status))
+		return -EBUSY;
+
 	ret = -ENODEV;
 
 	if (MACHINE_IS_VM) {
 		ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
-		if (!ebc_cmd)
+		if (!ebc_cmd) {
+			clear_bit(DIAG_WDOG_BUSY, &wdt_status);
 			return -ENOMEM;
+		}
 		len = strlcpy(ebc_cmd, wdt_cmd, MAX_CMDLEN);
 		ASCEBC(ebc_cmd, MAX_CMDLEN);
 		EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
···
 
 	if (ret) {
 		pr_err("The watchdog cannot be activated\n");
+		clear_bit(DIAG_WDOG_BUSY, &wdt_status);
 		return ret;
 	}
 	return 0;
···
 
 	diag_stat_inc(DIAG_STAT_X288);
 	ret = __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
+
+	clear_bit(DIAG_WDOG_BUSY, &wdt_status);
+
 	return ret;
 }
 
···
  * It makes no sense to go into suspend while the watchdog is running.
  * Depending on the memory size, the watchdog might trigger, while we
  * are still saving the memory.
- * We reuse the open flag to ensure that suspend and watchdog open are
- * exclusive operations
  */
 static int wdt_suspend(void)
 {
-	if (test_and_set_bit(WDOG_DEV_OPEN, &wdt_dev.status)) {
-		pr_err("Linux cannot be suspended while the watchdog is in use\n");
-		return notifier_from_errno(-EBUSY);
-	}
-	if (test_bit(WDOG_ACTIVE, &wdt_dev.status)) {
-		clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
+	if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status)) {
 		pr_err("Linux cannot be suspended while the watchdog is in use\n");
 		return notifier_from_errno(-EBUSY);
 	}
···
 
 static int wdt_resume(void)
 {
-	clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
+	clear_bit(DIAG_WDOG_BUSY, &wdt_status);
 	return NOTIFY_DONE;
 }