linux-kernel - [PATCH] pwm: omap-dmtimer: Add missing put_device() call in pwm_omap_dmtimer

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Message-ID: <fd7a56e4-2a35-a6c4-e5bd-1e53a6c48687@web.de>
Date:   Sat, 9 Nov 2019 13:26:50 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     linux-pwm@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Keerthy <j-keerthy@...com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Grant Erickson <marathon96@...il.com>,
        Joachim Eastwood <manabian@...il.com>,
        Neil Brown <neilb@...e.de>, Wen Yang <wen.yang99@....com.cn>
Subject: [PATCH] pwm: omap-dmtimer: Add missing put_device() call in
 pwm_omap_dmtimer_probe()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 9 Nov 2019 13:09:42 +0100

A coccicheck run provided information like the following.

drivers/pwm/pwm-omap-dmtimer.c:304:2-8: ERROR: missing put_device;
call of_find_device_by_node on line 255, but without a corresponding
object release within this function.

Generated by: scripts/coccinelle/free/put_device.cocci

Thus add jump targets to fix the exception handling for this
function implementation.

Fixes: b7290cf6ff7869ec12070aa146c370728cab62c2 ("pwm: pwm-omap-dmtimer: Adapt driver to utilize dmtimer pdata ops")
Fixes: 6604c6556db9e41c85f2839f66bd9d617bcf9f87 ("pwm: Add PWM driver for OMAP using dual-mode timers")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/pwm/pwm-omap-dmtimer.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index 00772fc53490..958854213786 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -301,12 +301,13 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 put:
 	of_node_put(timer);
 	if (ret < 0)
-		return ret;
+		goto check_timer_pdev;

 	omap = devm_kzalloc(&pdev->dev, sizeof(*omap), GFP_KERNEL);
 	if (!omap) {
 		pdata->free(dm_timer);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto put_device;
 	}

 	omap->pdata = pdata;
@@ -340,12 +341,19 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register PWM\n");
 		omap->pdata->free(omap->dm_timer);
-		return ret;
+		goto put_device;
 	}

 	platform_set_drvdata(pdev, omap);

 	return 0;
+
+check_timer_pdev:
+	if (timer_pdev)
+put_device:
+		put_device(&timer_pdev->dev);
+
+	return ret;
 }

 static int pwm_omap_dmtimer_remove(struct platform_device *pdev)
--
2.24.0