USB: EHCI: make ehci-platform use devm_request_and_ioremap helper

This patch changes the ehci-platform driver to use the device managed helper
function 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 no longer need to release and iounmap
memory resources. devm_request_and_ioremap() will use either the ioremap()
or ioremap_nocache() handler depending on the resource's CACHEABLE flag, so
we are good with this change.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 15 deletions

diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 3cb0b1bf9ac2..272728c48c9e 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -123,29 +123,19 @@ 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)) {
-                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_request_and_ioremap(&dev->dev, res_mem);
         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 +151,6 @@ 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);