NLM failover - deadlock

There is an existing NLM deadlock bug that can be easily triggered by patch 5-1 (but the bug exists with and without this patch set). We include the temporary workaround here for reference purpose. The real fix has been worked on:

http://sourceforge.net/mailarchive/forum.php?
thread_id=30052343&forum_id=4930

@@ -264,7 +264,9 @@ static void nlmsvc_free_block(struct kre
 
 	nlmsvc_freegrantargs(block->b_call);
 	nlm_release_call(block->b_call);
-	nlm_release_file(block->b_file);
+	down(&file->f_sema);
+	file->f_count--;
+	up(&file->f_sema);
 	kfree(block);
 }
 

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