Author: hselasky
Date: Wed Dec 21 08:46:08 2011
New Revision: 228758
URL: http://svn.freebsd.org/changeset/base/228758
Log:
Fix for race against user-space applications trying to change the
configuration on USB HUBs.
PR: kern/163091
MFC after: 1 week
Modified:
head/sys/dev/usb/usb_hub.c
Modified: head/sys/dev/usb/usb_hub.c
==============================================================================
--- head/sys/dev/usb/usb_hub.c Wed Dec 21 02:45:51 2011 (r228757)
+++ head/sys/dev/usb/usb_hub.c Wed Dec 21 08:46:08 2011 (r228758)
@@ -707,6 +707,13 @@ uhub_explore(struct usb_device *udev)
DPRINTF("Device is suspended!\n");
return (0);
}
+
+ /*
+ * Make sure we don't race against user-space applications
+ * like LibUSB:
+ */
+ usbd_enum_lock(udev);
+
for (x = 0; x != hub->nports; x++) {
up = hub->ports + x;
portno = x + 1;
@@ -784,6 +791,8 @@ uhub_explore(struct usb_device *udev)
up->restartcnt = 0;
}
+ usbd_enum_unlock(udev);
+
/* initial status checked */
sc->sc_flags |= UHUB_FLAG_DID_EXPLORE;
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