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usbfs: simplify the lookup-by-minor routines

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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>
This commit is contained in:
Alan Stern 2008-06-24 14:47:12 -04:00 committed by Greg Kroah-Hartman
parent cd9f03759d
commit 61ad04a89f
1 changed files with 6 additions and 9 deletions
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15
drivers/usb/core/devio.c
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@ -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)