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authorAlan Stern <stern@rowland.harvard.edu>2005-11-17 17:10:32 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-04 13:48:34 -0800
commit9ad3d6ccf5eee285e233dbaf186369b8d477a666 (patch)
tree4ad43518e01f1b2c6513e79b318d974979041b99 /include/linux/usb.h
parent75318d2d7cab77b14c5d3dbd5e69f2680a769e16 (diff)
downloadop-kernel-dev-9ad3d6ccf5eee285e233dbaf186369b8d477a666.zip
op-kernel-dev-9ad3d6ccf5eee285e233dbaf186369b8d477a666.tar.gz
[PATCH] USB: Remove USB private semaphore
This patch (as605) removes the private udev->serialize semaphore, relying instead on the locking provided by the embedded struct device's semaphore. The changes are confined to the core, except that the usb_trylock_device routine now uses the return convention of down_trylock rather than down_read_trylock (they return opposite values for no good reason). A couple of other associated changes are included as well: Now that we aren't concerned about HCDs that avoid using the hcd glue layer, usb_disconnect no longer needs to acquire the usb_bus_lock -- that can be done by usb_remove_hcd where it belongs. Devices aren't locked over the same scope of code in usb_new_device and hub_port_connect_change as they used to be. This shouldn't cause any trouble. Along with the preceding driver core patch, this needs a lot of testing. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r--include/linux/usb.h9
1 files changed, 4 insertions, 5 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 2714814..46dc042 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -329,8 +329,6 @@ struct usb_device {
struct usb_tt *tt; /* low/full speed dev, highspeed hub */
int ttport; /* device port on that tt hub */
- struct semaphore serialize;
-
unsigned int toggle[2]; /* one bit for each endpoint
* ([0] = IN, [1] = OUT) */
@@ -377,11 +375,12 @@ struct usb_device {
extern struct usb_device *usb_get_dev(struct usb_device *dev);
extern void usb_put_dev(struct usb_device *dev);
-extern void usb_lock_device(struct usb_device *udev);
-extern int usb_trylock_device(struct usb_device *udev);
+/* USB device locking */
+#define usb_lock_device(udev) down(&(udev)->dev.sem)
+#define usb_unlock_device(udev) up(&(udev)->dev.sem)
+#define usb_trylock_device(udev) down_trylock(&(udev)->dev.sem)
extern int usb_lock_device_for_reset(struct usb_device *udev,
struct usb_interface *iface);
-extern void usb_unlock_device(struct usb_device *udev);
/* USB port reset for device reinitialization */
extern int usb_reset_device(struct usb_device *dev);
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