watchdog: s3c2410: Fail probe if can't find valid timeout

Driver can't work properly if there no valid timeout was found in
s3c2410wdt_set_heartbeat(). Ideally, that function should be reworked in
a way that it's always able to find some valid timeout. As a temporary
solution let's for now just fail the driver probe in case the valid
timeout can't be found in s3c2410wdt_set_heartbeat() function.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211107202943.8859-4-semen.protsenko@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 2395f35..00421cf 100644 (file)
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -515,7 +515,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
        struct s3c2410_wdt *wdt;
        struct resource *wdt_irq;
        unsigned int wtcon;
-       int started = 0;
        int ret;
 
        wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
@@ -581,15 +580,15 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
        ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
                                        wdt->wdt_device.timeout);
        if (ret) {
-               started = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
-                                       S3C2410_WATCHDOG_DEFAULT_TIME);
-
-               if (started == 0)
-                       dev_info(dev,
-                                "tmr_margin value out of range, default %d used\n",
+               ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
+                                              S3C2410_WATCHDOG_DEFAULT_TIME);
+               if (ret == 0) {
+                       dev_warn(dev, "tmr_margin value out of range, default %d used\n",
                                 S3C2410_WATCHDOG_DEFAULT_TIME);
-               else
-                       dev_info(dev, "default timer value is out of range, cannot start\n");
+               } else {
+                       dev_err(dev, "failed to use default timeout\n");
+                       goto err_cpufreq;
+               }
        }
 
        ret = devm_request_irq(dev, wdt_irq->start, s3c2410wdt_irq, 0,
@@ -613,10 +612,10 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
        if (ret < 0)
                goto err_unregister;
 
-       if (tmr_atboot && started == 0) {
+       if (tmr_atboot) {
                dev_info(dev, "starting watchdog timer\n");
                s3c2410wdt_start(&wdt->wdt_device);
-       } else if (!tmr_atboot) {
+       } else {
                /* if we're not enabling the watchdog, then ensure it is
                 * disabled if it has been left running from the bootloader
                 * or other source */