[PATCH] watchdog: s3c2410: Fix getting the optional clock

[Sam Protsenko]

"watchdog_src" clock is optional and may not be present for some SoCs
supported by this driver. Nevertheless, in case the clock is provided
but some error happens during its getting, that error should be handled
properly. Use devm_clk_get_optional() API for that. Also report possible
errors using dev_err_probe() to handle properly -EPROBE_DEFER error (if
clock provider is not ready by the time WDT probe function is executed).

Fixes: a4f3dc8d5fbc ("watchdog: s3c2410: Support separate source clock")
Reported-by: kernel test robot <lkp at intel.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Suggested-by: Guenter Roeck <linux at roeck-us.net>
Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
---
 drivers/watchdog/s3c2410_wdt.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index bb374b9fc163..71c280d3e1a2 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -713,16 +713,18 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	 * "watchdog_src" clock is optional; if it's not present -- just skip it
 	 * and use "watchdog" clock as both bus and source clock.
 	 */
-	wdt->src_clk = devm_clk_get(dev, "watchdog_src");
-	if (!IS_ERR(wdt->src_clk)) {
-		ret = clk_prepare_enable(wdt->src_clk);
-		if (ret < 0) {
-			dev_err(dev, "failed to enable source clock\n");
-			ret = PTR_ERR(wdt->src_clk);
-			goto err_bus_clk;
-		}
-	} else {
-		wdt->src_clk = NULL;
+	wdt->src_clk = devm_clk_get_optional(dev, "watchdog_src");
+	if (IS_ERR(wdt->src_clk)) {
+		dev_err_probe(dev, PTR_ERR(wdt->src_clk),
+			      "failed to get source clock\n");
+		ret = PTR_ERR(wdt->src_clk);
+		goto err_bus_clk;
+	}
+
+	ret = clk_prepare_enable(wdt->src_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable source clock\n");
+		goto err_bus_clk;
 	}
 
 	wdt->wdt_device.min_timeout = 1;
-- 
2.30.2