[PATCH] usb: host: xhci-plat: use devm_functions

[Himangi Saraogi <himangi774@gmail.com>]

This patch introduces the use of managed interface devm_ioremap_resource
for ioremap_nocache and request_mem_region and removes the corresponding
free functions in the probe and remove functions.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
---
 drivers/usb/host/xhci-plat.c | 25 +++++--------------------
 1 file changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 29d8adb..31d14a5 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -140,18 +140,11 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);
 
-	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
-				driver->description)) {
-		dev_dbg(&pdev->dev, "controller already in use\n");
-		ret = -EBUSY;
-		goto put_hcd;
-	}
-
-	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
-	if (!hcd->regs) {
+	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hcd->regs)) {
 		dev_dbg(&pdev->dev, "error mapping memory\n");
-		ret = -EFAULT;
-		goto release_mem_region;
+		ret = PTR_ERR(hcd->regs);
+		goto put_hcd;
 	}
 
 	/*
@@ -162,7 +155,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (!IS_ERR(clk)) {
 		ret = clk_prepare_enable(clk);
 		if (ret)
-			goto unmap_registers;
+			goto put_hcd;
 	}
 
 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
@@ -207,12 +200,6 @@ disable_clk:
 	if (!IS_ERR(clk))
 		clk_disable_unprepare(clk);
 
-unmap_registers:
-	iounmap(hcd->regs);
-
-release_mem_region:
-	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
-
 put_hcd:
 	usb_put_hcd(hcd);
 
@@ -231,8 +218,6 @@ static int xhci_plat_remove(struct platform_device *dev)
 	usb_remove_hcd(hcd);
 	if (!IS_ERR(clk))
 		clk_disable_unprepare(clk);
-	iounmap(hcd->regs);
-	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);
 	kfree(xhci);
 
-- 
1.9.1