one more BUSY

e85cb90c · Frans Kaashoek · 564a1cf0 · e85cb90c
--- a/memide.c
+++ b/memide.c
@@ -39,8 +39,8 @@ iderw(struct buf *b)
 {
  uchar *p;

-  if(!(b->flags & B_BUSY))
-    panic("iderw: buf not busy");
+  if(!holdingsleep(&b->lock))
+    panic("iderw: buf not locked");
  if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
    panic("iderw: nothing to do");
  if(b->dev != 1)