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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6

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* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6:
  USB: Close usb_find_interface race v3
  Revert "USB: Close usb_find_interface race"
This commit is contained in:
Linus Torvalds 2009-12-15 08:58:13 -08:00
commit 7f6cd5408a
1 changed files with 16 additions and 7 deletions
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23
drivers/usb/core/usb.c
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@ -167,18 +167,23 @@ struct usb_host_interface *usb_altnum_to_altsetting(
} }
EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting);
struct find_interface_arg {
int minor;
struct device_driver *drv;
};
static int __find_interface(struct device *dev, void *data) static int __find_interface(struct device *dev, void *data)
{ {
int *minor = data; struct find_interface_arg *arg = data;
struct usb_interface *intf; struct usb_interface *intf;
if (!is_usb_interface(dev)) if (!is_usb_interface(dev))
return 0; return 0;
if (dev->driver != arg->drv)
return 0;
intf = to_usb_interface(dev); intf = to_usb_interface(dev);
if (intf->minor != -1 && intf->minor == *minor) return intf->minor == arg->minor;
return 1;
return 0;
} }
/** /**
@ -187,14 +192,18 @@ static int __find_interface(struct device *dev, void *data)
* @minor: the minor number of the desired device * @minor: the minor number of the desired device
* *
* This walks the bus device list and returns a pointer to the interface * This walks the bus device list and returns a pointer to the interface
* with the matching minor. Note, this only works for devices that share the * with the matching minor and driver. Note, this only works for devices
* USB major number. * that share the USB major number.
*/ */
struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
{ {
struct find_interface_arg argb;
struct device *dev; struct device *dev;
dev = bus_find_device(&usb_bus_type, NULL, &minor, __find_interface); argb.minor = minor;
argb.drv = &drv->drvwrap.driver;
dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface);
/* Drop reference count from bus_find_device */ /* Drop reference count from bus_find_device */
put_device(dev); put_device(dev);