linux-kernel - [PATCH] mfd: fsl-imx25: fix check for platform_get

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Date:   Thu, 11 Aug 2022 13:53:05 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Lee Jones <lee@...nel.org>, Martin Kaiser <martin@...ser.cx>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] mfd: fsl-imx25: fix check for platform_get_irq() errors

The mx25_tsadc_remove() function assumes all non-zero returns are success
but the platform_get_irq() function returns negative on error and
positive non-zero values on success.  It never returns zero, but if it
did then treat that as a success.

Fixes: 18f773937968 ("mfd: fsl-imx25: Clean up irq settings during removal")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/mfd/fsl-imx25-tsadc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
index 37e5e02a1d05..dfc6da9b4aec 100644
--- a/drivers/mfd/fsl-imx25-tsadc.c
+++ b/drivers/mfd/fsl-imx25-tsadc.c
@@ -69,7 +69,7 @@ static int mx25_tsadc_setup_irq(struct platform_device *pdev,
 	int irq;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0)
 		return irq;
 
 	tsadc->domain = irq_domain_add_simple(np, 2, 0, &mx25_tsadc_domain_ops,
@@ -179,7 +179,7 @@ static int mx25_tsadc_remove(struct platform_device *pdev)
 	struct mx25_tsadc *tsadc = platform_get_drvdata(pdev);
 	int irq = platform_get_irq(pdev, 0);
 
-	if (irq) {
+	if (irq >= 0) {
 		irq_set_chained_handler_and_data(irq, NULL, NULL);
 		irq_domain_remove(tsadc->domain);
 	}
-- 
2.35.1