usbfs: simplify the lookup-by-minor routines
Alan Stern [Tue, 24 Jun 2008 18:47:12 +0000 (14:47 -0400)]
This patch (as1105) simplifies the lookup-by-minor-number code in
usbfs.  Instead of passing the minor number to the callback, which
must then reconstruct the entire dev_t value, the patch passes the
dev_t value directly.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/devio.c

index bbd029f..57bedce 100644 (file)
@@ -550,20 +550,16 @@ static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
        return ret;
 }
 
-static int __match_minor(struct device *dev, void *data)
+static int match_devt(struct device *dev, void *data)
 {
-       int minor = *((int *)data);
-
-       if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
-               return 1;
-       return 0;
+       return (dev->devt == (dev_t) data);
 }
 
-static struct usb_device *usbdev_lookup_by_minor(int minor)
+static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 {
        struct device *dev;
 
-       dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
+       dev = bus_find_device(&usb_bus_type, NULL, (void *) devt, match_devt);
        if (!dev)
                return NULL;
        put_device(dev);
@@ -589,9 +585,10 @@ static int usbdev_open(struct inode *inode, struct file *file)
                goto out;
 
        ret = -ENOENT;
+
        /* usbdev device-node */
        if (imajor(inode) == USB_DEVICE_MAJOR)
-               dev = usbdev_lookup_by_minor(iminor(inode));
+               dev = usbdev_lookup_by_devt(inode->i_rdev);
 #ifdef CONFIG_USB_DEVICEFS
        /* procfs file */
        if (!dev)