linux-kernel - [PATCH v2] rtc: stmp3xxx: print message on error

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Date:	Sat, 30 Apr 2016 20:11:30 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH v2] rtc: stmp3xxx: print message on error

stmp3xxx_wdt_register() can fail as platform_device_alloc() or
platform_device_add() can fail. But when it fails it failed silently.
Lets print out an error message on failure so that user will atlest
know that there was some error.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---

v1 -  returned error while failing in the probe.

 drivers/rtc/rtc-stmp3xxx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-stmp3xxx.c b/drivers/rtc/rtc-stmp3xxx.c
index ca54d03..e6aaaa5 100644
--- a/drivers/rtc/rtc-stmp3xxx.c
+++ b/drivers/rtc/rtc-stmp3xxx.c
@@ -107,14 +107,19 @@ static struct stmp3xxx_wdt_pdata wdt_pdata = {
 
 static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev)
 {
+	int rc = -1;
 	struct platform_device *wdt_pdev =
 		platform_device_alloc("stmp3xxx_rtc_wdt", rtc_pdev->id);
 
 	if (wdt_pdev) {
 		wdt_pdev->dev.parent = &rtc_pdev->dev;
 		wdt_pdev->dev.platform_data = &wdt_pdata;
-		platform_device_add(wdt_pdev);
+		rc = platform_device_add(wdt_pdev);
 	}
+
+	if (rc)
+		dev_err(&rtc_pdev->dev,
+			"failed to register stmp3xxx_rtc_wdt\n");
 }
 #else
 static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev)
-- 
1.9.1