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Subject[PATCH v3 03/12] watchdog: s3c2410: Fail probe if can't find valid timeout
Date
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>
---
Changes in v3:
- Added R-b tag by Krzysztof Kozlowski

Changes in v2:
- (none): it's a new patch

drivers/watchdog/s3c2410_wdt.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 2395f353e52d..00421cf22556 100644
--- 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 */
--
2.30.2
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