From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59760 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933563AbbIZVSH (ORCPT ); Sat, 26 Sep 2015 17:18:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eli Cohen , Haggai Eran , Sagi Grimberg , Doug Ledford Subject: [PATCH 4.1 103/159] IB/mlx5: avoid destroying a NULL mr in reg_user_mr error flow Date: Sat, 26 Sep 2015 13:55:49 -0700 Message-Id: <20150926205319.717016182@linuxfoundation.org> In-Reply-To: <20150926205313.363686083@linuxfoundation.org> References: <20150926205313.363686083@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: stable-owner@vger.kernel.org List-ID: 4.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Haggai Eran commit 11d748045c6dadb279d1acdb6d2ea8f3f2ede85b upstream. The mlx5_ib_reg_user_mr() function will attempt to call clean_mr() in its error flow even though there is never a case where the error flow occurs with a valid MR pointer to destroy. Remove the clean_mr() call and the incorrect comment above it. Fixes: b4cfe447d47b ("IB/mlx5: Implement on demand paging by adding support for MMU notifiers") Cc: Eli Cohen Signed-off-by: Haggai Eran Reviewed-by: Sagi Grimberg Signed-off-by: Doug Ledford Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/mlx5/mr.c | 12 ------------ 1 file changed, 12 deletions(-) --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1119,19 +1119,7 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct return &mr->ibmr; error: - /* - * Destroy the umem *before* destroying the MR, to ensure we - * will not have any in-flight notifiers when destroying the - * MR. - * - * As the MR is completely invalid to begin with, and this - * error path is only taken if we can't push the mr entry into - * the pagefault tree, this is safe. - */ - ib_umem_release(umem); - /* Kill the MR, and return an error code. */ - clean_mr(mr); return ERR_PTR(err); }