linux-kernel - [PATCH] irqchip: imx-mu-msi: fix platform_get

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Date:   Fri, 12 Aug 2022 09:23:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Frank Li <Frank.Li@....com>
Cc:     Marc Zyngier <maz@...nel.org>, 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>,
        Jon Mason <jdmason@...zu.us>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] irqchip: imx-mu-msi: fix platform_get_irq() error checking

The platform_get_irq() function returns negative error codes on error
so "gic_irq" needs to be signed to handle this correctly.  Also change
the "<= 0" check to "< 0" and preserve the error code as the
documentation for platform_get_irq() shows.

Fixes: 893ae515ff8d ("irqchip: imx mu worked as msi controller")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/irqchip/irq-imx-mu-msi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-imx-mu-msi.c b/drivers/irqchip/irq-imx-mu-msi.c
index f7193a6c1245..97f3cdab8f58 100644
--- a/drivers/irqchip/irq-imx-mu-msi.c
+++ b/drivers/irqchip/irq-imx-mu-msi.c
@@ -80,7 +80,7 @@ struct imx_mu_msi {
 	struct imx_mu_msir	*msir;
 	u32			irqs_num;
 	unsigned long		used;
-	u32			gic_irq;
+	int			gic_irq;
 	struct clk              *clk;
 	struct device		*pd_a;
 	struct device		*pd_b;
@@ -355,8 +355,8 @@ static int imx_mu_msi_probe(struct platform_device *pdev)
 	msi_data->irqs_num = IMX_MU_CHANS;
 
 	msi_data->gic_irq = platform_get_irq(msi_data->pdev, 0);
-	if (msi_data->gic_irq <= 0)
-		return -ENODEV;
+	if (msi_data->gic_irq < 0)
+		return msi_data->gic_irq;
 
 	platform_set_drvdata(pdev, msi_data);
 
-- 
2.35.1