linux-kernel - [PATCH 31/32] USB: EHCI: make ehci-platform use devm_{ioremap,request_mem

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Date:	Fri,  5 Oct 2012 18:21:03 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	stern@...land.harvard.edu
Cc:	linux-usb@...r.kernel.org, Florian Fainelli <florian@...nwrt.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 31/32] USB: EHCI: make ehci-platform use devm_{ioremap,request_mem_region} helpers

This patch changes the ehci-platform driver to use the device managed helper
functions for requesting memory region and ioremapping memory resources.
As a result the error path in the probe function is simplified, and the
platform driver remove callback does not longer need to release and iounmap
memory resources.

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
---
 drivers/usb/host/ehci-platform.c |   16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 3cb0b1b..ebe92cf 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -123,29 +123,27 @@ static int __devinit ehci_platform_probe(struct platform_device *dev)
 	hcd->rsrc_start = res_mem->start;
 	hcd->rsrc_len = resource_size(res_mem);
 
-	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+	if (!devm_request_mem_region(&dev->dev, hcd->rsrc_start,
+					hcd->rsrc_len, hcd_name)) {
 		dev_err(&dev->dev, "controller already in use");
 		err = -EBUSY;
 		goto err_put_hcd;
 	}
 
-	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+	hcd->regs = devm_ioremap_nocache(&dev->dev, hcd->rsrc_start,
+						hcd->rsrc_len);
 	if (!hcd->regs) {
 		err = -ENOMEM;
-		goto err_release_region;
+		goto err_put_hcd;
 	}
 	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (err)
-		goto err_iounmap;
+		goto err_put_hcd;
 
 	platform_set_drvdata(dev, hcd);
 
 	return err;
 
-err_iounmap:
-	iounmap(hcd->regs);
-err_release_region:
-	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 err_put_hcd:
 	usb_put_hcd(hcd);
 err_power:
@@ -161,8 +159,6 @@ static int __devexit ehci_platform_remove(struct platform_device *dev)
 	struct usb_ehci_pdata *pdata = dev->dev.platform_data;
 
 	usb_remove_hcd(hcd);
-	iounmap(hcd->regs);
-	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);
 	platform_set_drvdata(dev, NULL);
 
-- 
1.7.9.5

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