From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936454AbaFIJ1s (ORCPT ); Mon, 9 Jun 2014 05:27:48 -0400 Received: from ip4-83-240-18-248.cust.nbox.cz ([83.240.18.248]:59137 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936439AbaFIJ1k (ORCPT ); Mon, 9 Jun 2014 05:27:40 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Andy Grover , Nicholas Bellinger , Jiri Slaby Subject: [PATCH 3.12 118/146] target: Don't allow setting WC emulation if device doesn't support Date: Mon, 9 Jun 2014 10:50:53 +0200 Message-Id: <86a063701078cb9b6037e0b627d448e5a53d1b7e.1402303821.git.jslaby@suse.cz> X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andy Grover 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 07b8dae38b09bcfede7e726f172e39b5ce8390d9 upstream. Just like for pSCSI, if the transport sets get_write_cache, then it is not valid to enable write cache emulation for it. Return an error. see https://bugzilla.redhat.com/show_bug.cgi?id=1082675 Reviewed-by: Chris Leech Signed-off-by: Andy Grover Signed-off-by: Nicholas Bellinger Signed-off-by: Jiri Slaby --- drivers/target/target_core_device.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index e5e39658034c..e31ec5cf0c36 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -799,10 +799,10 @@ int se_dev_set_emulate_write_cache(struct se_device *dev, int flag) pr_err("emulate_write_cache not supported for pSCSI\n"); return -EINVAL; } - if (dev->transport->get_write_cache) { - pr_warn("emulate_write_cache cannot be changed when underlying" - " HW reports WriteCacheEnabled, ignoring request\n"); - return 0; + if (flag && + dev->transport->get_write_cache) { + pr_err("emulate_write_cache not supported for this device\n"); + return -EINVAL; } dev->dev_attrib.emulate_write_cache = flag; -- 1.9.3