usb: Add a slice to usb host controllers

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/usb/core/usb.c

@@ -75,28 +75,30 @@ static int host_busnum = 1;
 
 static inline int usb_host_acquire(struct usb_host *host)
 {
-	if (host->sem)
+	if (slice_acquired(&host->slice))
 		return -EAGAIN;
-	host->sem++;
+
+	slice_acquire(&host->slice);
+
 	return 0;
 }
 
 static inline void usb_host_release(struct usb_host *host)
 {
-	if (host->sem > 0)
-		host->sem--;
+	slice_release(&host->slice);
 }
 
 int usb_register_host(struct usb_host *host)
 {
 	list_add_tail(&host->list, &host_list);
 	host->busnum = host_busnum++;
-	host->sem = 0;
+	slice_init(&host->slice, dev_name(host->hw_dev));
 	return 0;
 }
 
 void usb_unregister_host(struct usb_host *host)
 {
+	slice_exit(&host->slice);
 	list_del(&host->list);
 }
 

include/usb/usb.h

@@ -20,6 +20,7 @@
 #define _USB_H_
 
 #include <driver.h>
+#include <slice.h>
 #include <usb/ch9.h>
 #include <usb/ch11.h>
 #include <usb/usb_defs.h>
@@ -163,13 +164,18 @@ struct usb_host {
 	struct device_d *hw_dev;
 	int busnum;
 	struct usb_device *root_dev;
-	int sem;
 	struct usb_phy *usbphy;
+	struct slice slice;
 };
 
 int usb_register_host(struct usb_host *);
 void usb_unregister_host(struct usb_host *host);
 
+static inline struct slice *usb_device_slice(struct usb_device *udev)
+{
+	return &udev->host->slice;
+}
+
 int usb_host_detect(struct usb_host *host);
 
 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);