backports: fix build errors for old kernel versions without PCI support

index b3597ea..169a555 100644
@@ -212,9 +212,13 @@ EXPORT_SYMBOL_GPL(sg_alloc_table);
  */
 int pci_enable_device_mem(struct pci_dev *dev)
 {
+#ifdef CONFIG_PCI
 	int bars = pci_select_bars(dev, IORESOURCE_MEM);
 
 	return pci_enable_device_bars(dev, bars);
+#else
+	return 0;
+#endif
 }
 EXPORT_SYMBOL_GPL(pci_enable_device_mem);
 

index e47626b..2ff6b1e 100644
@@ -12,6 +12,7 @@
 #include <linux/usb.h>
 #include <linux/tty.h>
 #include <linux/skbuff.h>
+#include <linux/pci.h>
 #include <asm/poll.h>
 
 /* 2.6.28 compat code goes here */

index 5c82fc4..b6617f0 100644
@@ -114,6 +114,13 @@ static inline int is_unicast_ether_addr(const u8 *addr)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
+#define eth_prepare_mac_addr_change LINUX_BACKPORT(eth_prepare_mac_addr_change)
+extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
+#define eth_commit_mac_addr_change LINUX_BACKPORT(eth_commit_mac_addr_change)
+extern void eth_commit_mac_addr_change(struct net_device *dev, void *p);
+#endif /* < 3.9 */
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 #define eth_mac_addr LINUX_BACKPORT(eth_mac_addr)
 extern int eth_mac_addr(struct net_device *dev, void *p);

index 7926082..8f85b83 100644
@@ -29,4 +29,8 @@
 #define IFF_TX_SKB_SHARING	0x10000
 #endif
 
+#ifndef IFF_LIVE_ADDR_CHANGE
+#define IFF_LIVE_ADDR_CHANGE 0x100000
+#endif
+
 #endif	/* _BACKPORT_LINUX_IF_H */

index 03f3af8..1ce2dad 100644
@@ -12,6 +12,9 @@
 #include <linux/scatterlist.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
 
 #ifdef __sg_page_iter_next
 

@@ -64,4 +67,34 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 }
 EXPORT_SYMBOL_GPL(devm_ioremap_resource);
 
+/**
+ * eth_prepare_mac_addr_change - prepare for mac change
+ * @dev: network device
+ * @p: socket address
+ */
+int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+
+	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
+		return -EBUSY;
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+	return 0;
+}
+EXPORT_SYMBOL(eth_prepare_mac_addr_change);
+
+/**
+ * eth_commit_mac_addr_change - commit mac change
+ * @dev: network device
+ * @p: socket address
+ */
+void eth_commit_mac_addr_change(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+
+	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+}
+EXPORT_SYMBOL(eth_commit_mac_addr_change);
+
 #endif /* __sg_page_iter_next */

index 70f3a21..d217c81 100644
@@ -2,6 +2,10 @@
 #define __BACKPORT_PM_H
 #include_next <linux/pm.h>
 
+#ifndef PM_EVENT_AUTO
+#define PM_EVENT_AUTO		0x0400
+#endif
+
 #ifndef PM_EVENT_SLEEP
 #define PM_EVENT_SLEEP  (PM_EVENT_SUSPEND)
 #endif

index 368da6c..49a5762 100644
@@ -145,4 +145,21 @@ extern void usb_unpoison_urb(struct urb *urb);
 extern int usb_anchor_empty(struct usb_anchor *anchor);
 #endif /* 2.6.23-2.6.27 */
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+#if defined(CONFIG_USB) || defined(CONFIG_USB_MODULE)
+static inline int usb_translate_errors(int error_code)
+{
+	switch (error_code) {
+	case 0:
+	case -ENOMEM:
+	case -ENODEV:
+	case -EOPNOTSUPP:
+		return error_code;
+	default:
+		return -EIO;
+	}
+}
+#endif /* CONFIG_USB */
+#endif /* < 2.6.39 */
+
 #endif /* __BACKPORT_USB_H */

new file mode 100644
index 0000000..252a6f1
@@ -0,0 +1,23 @@
+#ifndef __BACKPORT__LINUX_USB_CH9_H
+#define __BACKPORT__LINUX_USB_CH9_H
+
+#include_next <linux/usb/ch9.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
+#include <linux/types.h>    /* __u8 etc */
+#include <asm/byteorder.h>  /* le16_to_cpu */
+
+/**
+ * usb_endpoint_maxp - get endpoint's max packet size
+ * @epd: endpoint to be checked
+ *
+ * Returns @epd's max packet
+ */
+static inline int usb_endpoint_maxp(const struct usb_endpoint_descriptor *epd)
+{
+	return __le16_to_cpu(epd->wMaxPacketSize);
+}
+#endif /* < 3.2 */
+
+#endif /* __BACKPORT__LINUX_USB_CH9_H */

index 252a6f1..40d5d3f 100644
@@ -1,9 +1,31 @@
 #ifndef __BACKPORT__LINUX_USB_CH9_H
 #define __BACKPORT__LINUX_USB_CH9_H
 
-#include_next <linux/usb/ch9.h>
 #include <linux/version.h>
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
+#define usb_device_speed old_usb_device_speed
+#define USB_SPEED_UNKNOWN OLD_USB_SPEED_UNKNOWN
+#define USB_SPEED_LOW OLD_USB_SPEED_LOW
+#define USB_SPEED_FULL OLD_USB_SPEED_FULL
+#define USB_SPEED_HIGH OLD_USB_SPEED_HIGH
+#include_next <linux/usb/ch9.h>
+#undef usb_device_speed
+#undef USB_SPEED_UNKNOWN
+#undef USB_SPEED_LOW
+#undef USB_SPEED_FULL
+#undef USB_SPEED_HIGH
+enum usb_device_speed {
+	USB_SPEED_UNKNOWN = 0,          /* enumerating */
+	USB_SPEED_LOW, USB_SPEED_FULL,      /* usb 1.1 */
+	USB_SPEED_HIGH,             /* usb 2.0 */
+	USB_SPEED_WIRELESS,         /* wireless (usb 2.5) */
+	USB_SPEED_SUPER,            /* usb 3.0 */
+};
+#else
+#include_next <linux/usb/ch9.h>
+#endif /* < 2.6.30 */
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
 #include <linux/types.h>    /* __u8 etc */
 #include <asm/byteorder.h>  /* le16_to_cpu */

index 7f3a81b..775c2d3 100644
@@ -5,6 +5,9 @@
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25))
 #include_next <linux/math64.h>
+#else
+#include <linux/types.h>
+#include <asm/div64.h>
 #endif /* (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)) */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)

index 504a615..0aadc80 100644
@@ -4,7 +4,7 @@
 #include <linux/version.h>
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
-#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
+#if defined(CONFIG_X86) || defined(CONFIG_X86_64) || defined(CONFIG_ARM)
 
 #if defined(CONFIG_64BIT) || defined(CONFIG_X86_PAE) || defined(CONFIG_PHYS_64BIT)
 typedef u64 phys_addr_t;

@@ -12,7 +12,7 @@ typedef u64 phys_addr_t;
 typedef u32 phys_addr_t;
 #endif
 
-#endif /* x86 */
+#endif /* x86 || ARM */
 #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) /* < 2.6.25 */
 
 #if defined(CONFIG_X86) || defined(CONFIG_X86_64) || defined(CONFIG_PPC)