irda: Fix lockdep annotations in hashbin_delete().

A nested lock depth was added to the hasbin_delete() code but it
doesn't actually work some well and results in tons of lockdep splats.

Fix the code instead to properly drop the lock around the operation
and just keep peeking the head of the hashbin queue.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/irda/irqueue.c b/net/irda/irqueue.c
index acbe61c7e6831205ca1d725f65263c849ef092e4..160dc89335e207e593401f43c0637a766bdb9b68 100644 (file)
--- a/net/irda/irqueue.c
+++ b/net/irda/irqueue.c
@@ -383,9 +383,6 @@ EXPORT_SYMBOL(hashbin_new);
  *    for deallocating this structure if it's complex. If not the user can
  *    just supply kfree, which should take care of the job.
  */
-#ifdef CONFIG_LOCKDEP
-static int hashbin_lock_depth = 0;
-#endif
 int hashbin_delete( hashbin_t* hashbin, FREE_FUNC free_func)
 {
        irda_queue_t* queue;
@@ -396,22 +393,27 @@ int hashbin_delete( hashbin_t* hashbin, FREE_FUNC free_func)
        IRDA_ASSERT(hashbin->magic == HB_MAGIC, return -1;);
 
        /* Synchronize */
-       if ( hashbin->hb_type & HB_LOCK ) {
-               spin_lock_irqsave_nested(&hashbin->hb_spinlock, flags,
-                                        hashbin_lock_depth++);
-       }
+       if (hashbin->hb_type & HB_LOCK)
+               spin_lock_irqsave(&hashbin->hb_spinlock, flags);
 
        /*
         *  Free the entries in the hashbin, TODO: use hashbin_clear when
         *  it has been shown to work
         */
        for (i = 0; i < HASHBIN_SIZE; i ++ ) {
-               queue = dequeue_first((irda_queue_t**) &hashbin->hb_queue[i]);
-               while (queue ) {
-                       if (free_func)
-                               (*free_func)(queue);
-                       queue = dequeue_first(
-                               (irda_queue_t**) &hashbin->hb_queue[i]);
+               while (1) {
+                       queue = dequeue_first((irda_queue_t**) &hashbin->hb_queue[i]);
+
+                       if (!queue)
+                               break;
+
+                       if (free_func) {
+                               if (hashbin->hb_type & HB_LOCK)
+                                       spin_unlock_irqrestore(&hashbin->hb_spinlock, flags);
+                               free_func(queue);
+                               if (hashbin->hb_type & HB_LOCK)
+                                       spin_lock_irqsave(&hashbin->hb_spinlock, flags);
+                       }
                }
        }
 
@@ -420,12 +422,8 @@ int hashbin_delete( hashbin_t* hashbin, FREE_FUNC free_func)
        hashbin->magic = ~HB_MAGIC;
 
        /* Release lock */
-       if ( hashbin->hb_type & HB_LOCK) {
+       if (hashbin->hb_type & HB_LOCK)
                spin_unlock_irqrestore(&hashbin->hb_spinlock, flags);
-#ifdef CONFIG_LOCKDEP
-               hashbin_lock_depth--;
-#endif
-       }
 
        /*
         *  Free the hashbin structure