Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>,
        Martin Kaiser <martin@kaiser.cx>, Lee Jones <lee@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 161/255] mfd: fsl-imx25: Fix check for platform_get_irq() errors
Date:   Mon, 24 Oct 2022 13:31:11 +0200
Message-Id: <20221024113008.040133654@linuxfoundation.org>
In-Reply-To: <20221024113002.471093005@linuxfoundation.org>
References: <20221024113002.471093005@linuxfoundation.org>
User-Agent: quilt/0.67
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

[ Upstream commit 75db7907355ca5e2ff606e9dd3e86b6c3a455fe2 ]

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@oracle.com>
Reviewed-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/YvTfkbVQWYKMKS/t@kili
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 95103b2cc471..5f1f6f3a0696 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,
@@ -89,7 +89,7 @@ static int mx25_tsadc_unset_irq(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