[PATCH] watchdog: gef_wdt: Fix an error handling path in 'gef_wdt_probe()'

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: wim@linux-watchdog.org, linux@roeck-us.net, martyn.welch@gefanuc.com
Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] watchdog: gef_wdt:  Fix an error handling path in 'gef_wdt_probe()'
Date: Sun,  6 Jun 2021 16:49:18 +0200	[thread overview]
Message-ID: <3d775a5ac7e26fa5dd4c47f75fef6d5f336de1e3.1622990863.git.christophe.jaillet@wanadoo.fr> (raw)

If an error occurs after a successful 'of_iomap()' call, it must be undone
by a corresponding 'iounmap()' call, as already done in the remove
function.

Fixes: 3268b5618f38 ("[WATCHDOG] Basic support for GE Fanuc's FPGA based watchdog timer")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/watchdog/gef_wdt.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/gef_wdt.c b/drivers/watchdog/gef_wdt.c
index df5406aa7d25..52573176101f 100644
--- a/drivers/watchdog/gef_wdt.c
+++ b/drivers/watchdog/gef_wdt.c
@@ -264,6 +264,7 @@ static int gef_wdt_probe(struct platform_device *dev)
 {
 	int timeout = 10;
 	u32 freq;
+	int ret;
 
 	bus_clk = 133; /* in MHz */
 
@@ -280,7 +281,15 @@ static int gef_wdt_probe(struct platform_device *dev)
 
 	gef_wdt_handler_disable();	/* in case timer was already running */
 
-	return misc_register(&gef_wdt_miscdev);
+	ret = misc_register(&gef_wdt_miscdev);
+	if (ret)
+		goto iounmap_err;
+
+	return 0;
+
+iounmap_err:
+	iounmap(gef_wdt_regs);
+	return ret;
 }
 
 static int gef_wdt_remove(struct platform_device *dev)
-- 
2.30.2

