Author: hselasky
Date: Fri Jan 17 08:21:09 2014
New Revision: 260808
URL: http://svnweb.freebsd.org/changeset/base/260808
Log:
Close a minor deadlock.
MFC after: 1 week
Modified:
head/sys/dev/usb/usb_dev.c
Modified: head/sys/dev/usb/usb_dev.c
==============================================================================
--- head/sys/dev/usb/usb_dev.c Fri Jan 17 06:43:35 2014 (r260807)
+++ head/sys/dev/usb/usb_dev.c Fri Jan 17 08:21:09 2014 (r260808)
@@ -597,6 +597,13 @@ usb_fifo_free(struct usb_fifo *f)
mtx_unlock(f->priv_mtx);
mtx_lock(&usb_ref_lock);
+ /*
+ * Check if the "f->refcount" variable reached zero
+ * during the unlocked time before entering wait:
+ */
+ if (f->refcount == 0)
+ break;
+
/* wait for sync */
cv_wait(&f->cv_drain, &usb_ref_lock);
}
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "[email protected]"
