[IA64] perfmon: fix async exit bug

Move the cleanup of the async queue to the close callback from the flush
callback. This avoids losing asynchronous overflow notifications when
the file descriptor is shared by multiple processes and one terminates.
Signed-off-by: NStephane Eranian <eranian@gmail.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/kernel/perfmon.c

@@ -1864,11 +1864,6 @@ pfm_flush(struct file *filp, fl_owner_t id)
 	 * invoked after, it will find an empty queue and no
 	 * signal will be sent. In both case, we are safe
 	 */
-	if (filp->f_flags & FASYNC) {
-		DPRINT(("cleaning up async_queue=%p\n", ctx->ctx_async_queue));
-		pfm_do_fasync (-1, filp, ctx, 0);
-	}
-
 	PROTECT_CTX(ctx, flags);
 
 	state     = ctx->ctx_state;
@@ -1999,6 +1994,11 @@ pfm_close(struct inode *inode, struct file *filp)
 		return -EBADF;
 	}
 
+	if (filp->f_flags & FASYNC) {
+		DPRINT(("cleaning up async_queue=%p\n", ctx->ctx_async_queue));
+		pfm_do_fasync(-1, filp, ctx, 0);
+	}
+
 	PROTECT_CTX(ctx, flags);
 
 	state     = ctx->ctx_state;