driver: Fix return check of dev_request_mem_region

dev_request_mem_region returns an ERR_PTR, fix places which check for a
NULL pointer instead. This patch has been generated with this semantic
patch, written by me and improved by Andrey Smirnov:

// <smpl>
@@
expression e;
expression e1;
@@
e = dev_request_mem_region(...);
...
-if (!e)
-	return e1;
+if (IS_ERR(e))
+	return PTR_ERR(e);

@ rule1 @
expression e;
@@
e = dev_request_mem_region(...);

@@
expression rule1.e;
identifier ret, label;
constant errno;
@@
if (!e) {
	...
(
-	ret = -errno;
+	ret = PTR_ERR(e);
	...
	goto label;
|
-	return -errno;
+	return PTR_ERR(e);
)
}

@depends on rule1@
expression rule1.e;
@@
-	if (e == NULL)
+	if (IS_ERR(e))
{
...
}
// </smpl>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>

4 files changed, 8 insertions, 8 deletions

diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 3db3480cad..831fbde462 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1453,8 +1453,8 @@ static int __init pxa_udc_probe(struct device_d *dev)
 	int gpio, ret;
 
 	udc->regs = dev_request_mem_region(dev, 0);
-	if (!udc->regs)
-		return -ENXIO;
+	if (IS_ERR(udc->regs))
+		return PTR_ERR(udc->regs);
 
 	udc->dev = dev;
 	udc->mach = dev->platform_data;
diff --git a/drivers/usb/imx/imx-usb-misc.c b/drivers/usb/imx/imx-usb-misc.c
index af1a32110c..576dc9a2f9 100644
--- a/drivers/usb/imx/imx-usb-misc.c
+++ b/drivers/usb/imx/imx-usb-misc.c
@@ -553,8 +553,8 @@ static int imx_usbmisc_probe(struct device_d *dev)
 		return ret;
 
 	usbmisc_base = dev_request_mem_region(dev, 0);
-	if (!usbmisc_base)
-		return -ENOMEM;
+	if (IS_ERR(usbmisc_base))
+		return PTR_ERR(usbmisc_base);
 
 	imxusbmisc_data = devtype;
 
diff --git a/drivers/usb/imx/imx-usb-phy.c b/drivers/usb/imx/imx-usb-phy.c
index 837c1b5176..8ea08144d4 100644
--- a/drivers/usb/imx/imx-usb-phy.c
+++ b/drivers/usb/imx/imx-usb-phy.c
@@ -71,8 +71,8 @@ static int imx_usbphy_probe(struct device_d *dev)
 	imxphy = xzalloc(sizeof(*imxphy));
 
 	imxphy->base = dev_request_mem_region(dev, 0);
-	if (!imxphy->base) {
-		ret = -ENODEV;
+	if (IS_ERR(imxphy->base)) {
+		ret = PTR_ERR(imxphy->base);
 		goto err_free;
 	}
 
diff --git a/drivers/usb/musb/phy-am335x.c b/drivers/usb/musb/phy-am335x.c
index 2d58bbedb4..0a0b01dd27 100644
--- a/drivers/usb/musb/phy-am335x.c
+++ b/drivers/usb/musb/phy-am335x.c
@@ -37,8 +37,8 @@ static int am335x_phy_probe(struct device_d *dev)
 		return -ENOMEM;
 
 	am_usbphy->base = dev_request_mem_region(dev, 0);
-	if (!am_usbphy->base) {
-		ret = -ENODEV;
+	if (IS_ERR(am_usbphy->base)) {
+		ret = PTR_ERR(am_usbphy->base);
 		goto err_free;
 	}