linux-kernel - [PATCH 01/10 v5] Input: ep93xx_keypad: Fix platform_get

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Message-Id: <49ba0386f1930f58edfd5ee0f5e65d2a02a46744.1511280261.git.arvind.yadav.cs@gmail.com>
Date:   Tue, 21 Nov 2017 21:41:51 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     dmitry.torokhov@...il.com, maxime.ripard@...e-electrons.com,
        wens@...e.org, mcuos.com@...il.com, linux@...ck-us.net,
        linux@...linux.org.uk, lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 01/10 v5] Input: ep93xx_keypad: Fix platform_get_irq's error checking

The platform_get_irq() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq() error checking
for zero is not correct.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
changes in v2 :
              Return keypad->irq insted of -ENXIO.
changes in v3 :
              Add failure case '<= 0' instead of '< 0'. IRQ0 is not valid.
changes in v4 :
              Return -ENXIO insted of keypad->irq. Which was not correct in v3.
changes in v5 :
              Remove changes of v3 and v4. go back to version v2. Which is correct.
              No need to check for IRQ0 and return keypad->irq insted of -ENXIO.

 drivers/input/keyboard/ep93xx_keypad.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/keyboard/ep93xx_keypad.c b/drivers/input/keyboard/ep93xx_keypad.c
index f77b295..01788a7 100644
--- a/drivers/input/keyboard/ep93xx_keypad.c
+++ b/drivers/input/keyboard/ep93xx_keypad.c
@@ -257,8 +257,8 @@ static int ep93xx_keypad_probe(struct platform_device *pdev)
 	}
 
 	keypad->irq = platform_get_irq(pdev, 0);
-	if (!keypad->irq) {
-		err = -ENXIO;
+	if (keypad->irq < 0) {
+		err = keypad->irq;
 		goto failed_free;
 	}
 
-- 
2.7.4