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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:58:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:58:13 -0800
commit7f6cd5408a8ace522ca7f15893243e94ccc913e0 (patch)
treeaa84ba9df6b7f9af26c84162a455f9010bd8d285 /drivers/usb/core
parente956e6b77054f91580deb81ba6389cc8c8ce67ef (diff)
parentc2d284ee04ab6f6718de2ddcf1b43160e046c41d (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
* 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"
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/usb.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 043fa833eec..2fb42043b30 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -167,18 +167,23 @@ struct usb_host_interface *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)
{
- int *minor = data;
+ struct find_interface_arg *arg = data;
struct usb_interface *intf;
if (!is_usb_interface(dev))
return 0;
+ if (dev->driver != arg->drv)
+ return 0;
intf = to_usb_interface(dev);
- if (intf->minor != -1 && intf->minor == *minor)
- return 1;
- return 0;
+ return intf->minor == arg->minor;
}
/**
@@ -187,14 +192,18 @@ static int __find_interface(struct device *dev, void *data)
* @minor: the minor number of the desired device
*
* 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
- * USB major number.
+ * with the matching minor and driver. Note, this only works for devices
+ * that share the USB major number.
*/
struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
{
+ struct find_interface_arg argb;
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 */
put_device(dev);