linux-kernel - [PATCH] fotg210-udc: Use platform_get

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Date:   Tue, 15 Mar 2022 02:31:08 +0000
From:   cgel.zte@...il.com
To:     balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, fabian@...ter-vogt.de,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] fotg210-udc: Use platform_get_irq() to get the interrupt

From: Minghao Chi <chi.minghao@....com.cn>

It is not recommened to use platform_get_resource(pdev, IORESOURCE_IRQ)
for requesting IRQ's resources any more, as they can be not ready yet in
case of DT-booting.

platform_get_irq() instead is a recommended way for getting IRQ even if
it was not retrieved earlier.

It also makes code simpler because we're getting "int" value right away
and no conversion from resource to int is required.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
---
 drivers/usb/gadget/udc/fotg210-udc.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c
index fdca28e72a3b..f8501ed4886a 100644
--- a/drivers/usb/gadget/udc/fotg210-udc.c
+++ b/drivers/usb/gadget/udc/fotg210-udc.c
@@ -1087,11 +1087,12 @@ static int fotg210_udc_remove(struct platform_device *pdev)
 
 static int fotg210_udc_probe(struct platform_device *pdev)
 {
-	struct resource *res, *ires;
+	struct resource *res;
 	struct fotg210_udc *fotg210 = NULL;
 	struct fotg210_ep *_ep[FOTG210_MAX_NUM_EP];
 	int ret = 0;
 	int i;
+	int irq;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -1099,11 +1100,9 @@ static int fotg210_udc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!ires) {
-		pr_err("platform_get_resource IORESOURCE_IRQ error.\n");
-		return -ENODEV;
-	}
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	ret = -ENOMEM;
 
@@ -1176,7 +1175,7 @@ static int fotg210_udc_probe(struct platform_device *pdev)
 
 	fotg210_disable_unplug(fotg210);
 
-	ret = request_irq(ires->start, fotg210_irq, IRQF_SHARED,
+	ret = request_irq(irq, fotg210_irq, IRQF_SHARED,
 			  udc_name, fotg210);
 	if (ret < 0) {
 		pr_err("request_irq error (%d)\n", ret);
@@ -1192,7 +1191,7 @@ static int fotg210_udc_probe(struct platform_device *pdev)
 	return 0;
 
 err_add_udc:
-	free_irq(ires->start, fotg210);
+	free_irq(irq, fotg210);
 
 err_req:
 	fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
-- 
2.25.1