linux-kernel - [PATCH 1/2 v2] misc: aspeed-lpc-snoop: Fix platform_get

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Message-Id: <6e238a28aa79c581c90329060805c0b07e2187a7.1510995185.git.arvind.yadav.cs@gmail.com>
Date:   Sat, 18 Nov 2017 14:40:12 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     arnd@...db.de, gregkh@...uxfoundation.org, joel@....id.au,
        nicolas.ferre@...rochip.com, alexandre.belloni@...e-electrons.com,
        linux@...linux.org.uk
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 1/2 v2] misc: aspeed-lpc-snoop: 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 :
              Add failure case '<= 0' instead of '< 0'. IRQ 0 is not valid.

 drivers/misc/aspeed-lpc-snoop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/aspeed-lpc-snoop.c b/drivers/misc/aspeed-lpc-snoop.c
index cb78c98..14c3c90 100644
--- a/drivers/misc/aspeed-lpc-snoop.c
+++ b/drivers/misc/aspeed-lpc-snoop.c
@@ -115,8 +115,8 @@ static int aspeed_lpc_snoop_config_irq(struct aspeed_lpc_snoop *lpc_snoop,
 	int rc;
 
 	lpc_snoop->irq = platform_get_irq(pdev, 0);
-	if (!lpc_snoop->irq)
-		return -ENODEV;
+	if (lpc_snoop->irq <= 0)
+		return lpc_snoop->irq;
 
 	rc = devm_request_irq(dev, lpc_snoop->irq,
 			      aspeed_lpc_snoop_irq, IRQF_SHARED,
-- 
2.7.4