diff --git a/drivers/ata/intf_platform_ide.c b/drivers/ata/intf_platform_ide.c
index db4c356..851f8f5 100644
--- a/drivers/ata/intf_platform_ide.c
+++ b/drivers/ata/intf_platform_ide.c
@@ -97,8 +97,8 @@
 		alt_base = dev_request_mem_region(dev, 1);
 	} else {
 		reg = dev_get_resource(dev, IORESOURCE_IO, 0);
-		if (!reg)
-			return -ENODEV;
+		if (IS_ERR(reg))
+			return PTR_ERR(reg);
 
 		reg = request_ioport_region(dev_name(dev), reg->start,
 					    reg->end);
@@ -108,7 +108,7 @@
 		reg_base = (void __force __iomem *) reg->start;
 
 		alt = dev_get_resource(dev, IORESOURCE_IO, 1);
-		if (alt) {
+		if (!IS_ERR(alt)) {
 			alt = request_ioport_region(dev_name(dev),
 						    alt->start,
 						    alt->end);
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index d90da42..524ed1c 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -256,7 +256,7 @@
 		}
 	}
 
-	return NULL;
+	return ERR_PTR(-ENOENT);
 }
 
 void *dev_get_mem_region(struct device_d *dev, int num)
@@ -264,7 +264,7 @@
 	struct resource *res;
 
 	res = dev_get_resource(dev, IORESOURCE_MEM, num);
-	if (!res)
+	if (IS_ERR(res))
 		return NULL;
 
 	return (void __force *)res->start;
@@ -323,7 +323,7 @@
 	struct resource *res;
 
 	res = dev_get_resource(dev, IORESOURCE_MEM, num);
-	if (!res)
+	if (IS_ERR(res))
 		return NULL;
 
 	res = request_iomem_region(dev_name(dev), res->start, res->end);
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 231f4fe..9589a03 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -71,9 +71,9 @@
 		return -ENOMEM;
 
 	res = dev_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!res) {
+	if (IS_ERR(res)) {
 		free(syscon);
-		return -ENOENT;
+		return PTR_ERR(res);
 	}
 
 	res = request_iomem_region(dev_name(dev), res->start, res->end);
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 0466a15..c89fe87 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -48,6 +48,8 @@
 			cdev_find_free_index("sram"));
 
 	res = dev_get_resource(dev, IORESOURCE_MEM, 0);
+	if (IS_ERR(res))
+		return PTR_ERR(res);
 
 	sram->cdev.size = (unsigned long)resource_size(res);
 	sram->cdev.ops = &memops;
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 09e6a6a..dd0986c 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -317,8 +317,8 @@
 	int width;
 
 	res = dev_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
+	if (IS_ERR(res))
+		return PTR_ERR(res);
 
 	priv->mmiobase = dev_request_mem_region(dev, 0);
 
@@ -347,8 +347,8 @@
 	int width;
 
 	res = dev_get_resource(dev, IORESOURCE_IO, 0);
-	if (!res)
-		return -ENODEV;
+	if (IS_ERR(res))
+		return PTR_ERR(res);
 
 	res = request_ioport_region(dev_name(dev), res->start, res->end);
 	if (!res)