[NET]: In dst_ifdown(), synchronize_kernel() before dropping dev ref.

453a7051 · Alexey Kuznetsov · David S. Miller · a2b7d9e0 · 453a7051
Commit 453a7051 authored Jun 15, 2004 by Alexey Kuznetsov Committed by David S. Miller Jun 15, 2004
Hide whitespace changes
Inline Side-by-side

Showing with 6 additions and 0 deletions

net/core/dst.c net/core/dst.c +6 -0

No files found.
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -231,6 +231,12 @@ static void dst_ifdown(struct dst_entry *dst, int unregister)
 		if (unregister) {
 			dst->dev = &loopback_dev;
 			dev_hold(&loopback_dev);
+
+			/* Wait for at least one quiescent state after
+			 * detaching the stale device from dst.
+			 */
+			synchronize_kernel();
+
 			dev_put(dev);
 			if (dst->neighbour && dst->neighbour->dev == dev) {
 				dst->neighbour->dev = &loopback_dev;