1 files changed, 3 insertions, 2 deletions
diff --git a/ide.c b/ide.c
index 7fad55d..b3112b9 100644
--- a/ide.c
+++ b/ide.c
@@ -9,6 +9,7 @@
 #include "x86.h"
 #include "traps.h"
 #include "spinlock.h"
+#include "sleeplock.h"
 #include "fs.h"
 #include "buf.h"
 
@@ -139,8 +140,8 @@ iderw(struct buf *b)
 {
   struct buf **pp;
 
-  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 != 0 && !havedisk1)