Author: hselasky
Date: Tue Jan 3 09:17:50 2012
New Revision: 229371
URL: http://svn.freebsd.org/changeset/base/229371
Log:
MFC r228758:
- Fix for race against user-space applications trying to change the
configuration on USB HUBs.
PR: kern/163091
Modified:
stable/8/sys/dev/usb/usb_hub.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/conf/ldscript.mips.octeon1.32 (props changed)
stable/8/sys/conf/ldscript.mips.octeon1.64 (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/dev/usb/usb_hub.c
==============================================================================
--- stable/8/sys/dev/usb/usb_hub.c Tue Jan 3 09:15:54 2012
(r229370)
+++ stable/8/sys/dev/usb/usb_hub.c Tue Jan 3 09:17:50 2012
(r229371)
@@ -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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