linux-kernel - [PATCH 3/5] clocksource/drivers/timer-of: Checking for IS

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Date:   Fri, 11 Aug 2017 16:17:39 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de, mingo@...nel.org
Cc:     dingtianhong@...wei.com, matt.redfearn@...tec.com,
        dan.carpenter@...cle.com, garsilva@...eddedor.com,
        mka@...omium.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] clocksource/drivers/timer-of: Checking for IS_ERR() instead of NULL

From: Dan Carpenter <dan.carpenter@...cle.com>

The current code checks the return value of the of_io_request_and_map()
function as it was returning a NULL pointer in case of error.

However, it returns an error code encoded in the pointer return value, not a
NULL value. Fix this by checking the returned pointer against IS_ERR() and
return the error with PTR_ERR().

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-of.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index d509b50..4d7aef9 100644
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -128,9 +128,9 @@ static __init int timer_base_init(struct device_node *np,
 	const char *name = of_base->name ? of_base->name : np->full_name;
 
 	of_base->base = of_io_request_and_map(np, of_base->index, name);
-	if (!of_base->base) {
+	if (IS_ERR(of_base->base)) {
 		pr_err("Failed to iomap (%s)\n", name);
-		return -ENXIO;
+		return PTR_ERR(of_base->base);
 	}
 
 	return 0;
-- 
2.7.4