From patchwork Fri May 1 13:22:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 226544 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2919C47254 for ; Fri, 1 May 2020 13:53:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE14B2051A for ; Fri, 1 May 2020 13:53:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588341183; bh=qlK1Qsg9nh837m7uoLR3xqSQhl2zVHgNEkg9ggYtcJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=e7N1rAlfNkRiB/8dNI+Ze8qCZMz23yOhnLb+be91qN4xpALVGbTjDuTTu+FsNDgd8 ZDZtI+NtGExePIJEasYnAidKGKzruDdJKwFQZshKrzpaGHEE7ZDLxNmatyHXS3l4dW sWrUZNxHLoeYl+wQodPkSlY7pymgcr7OeMDzewnY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730910AbgEANgy (ORCPT ); Fri, 1 May 2020 09:36:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:35548 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730907AbgEANgx (ORCPT ); Fri, 1 May 2020 09:36:53 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5C65C216FD; Fri, 1 May 2020 13:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588340212; bh=qlK1Qsg9nh837m7uoLR3xqSQhl2zVHgNEkg9ggYtcJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y3FoyCuJDLTFWzVWczyMNXCssAQuvGDfWsqv1URxoy6q+MVPxpKEmVDVk7yCAi/tq DCbkbf2TA+DJSV5H9AWISilnpAcXICXgsbE91mBRItDHmNk/q3YzYHgGuVo8nhrBCZ RbNzjWfeecAHE9Nk14WRBeBaZv80HeyFVpy+8Ht0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Christie , Bodo Stroesser , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.19 34/46] scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN Date: Fri, 1 May 2020 15:22:59 +0200 Message-Id: <20200501131510.854207385@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131457.023036302@linuxfoundation.org> References: <20200501131457.023036302@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bodo Stroesser [ Upstream commit 066f79a5fd6d1b9a5cc57b5cd445b3e4bb68a5b2 ] In case command ring buffer becomes inconsistent, tcmu sets device flag TCMU_DEV_BIT_BROKEN. If the bit is set, tcmu rejects new commands from LIO core with TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, and no longer processes completions from the ring. The reset_ring attribute can be used to completely clean up the command ring, so after reset_ring the ring no longer is inconsistent. Therefore reset_ring also should reset bit TCMU_DEV_BIT_BROKEN to allow normal processing. Link: https://lore.kernel.org/r/20200409101026.17872-1-bstroesser@ts.fujitsu.com Acked-by: Mike Christie Signed-off-by: Bodo Stroesser Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/target_core_user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 7ee0a75ce4526..eff1e36ca03c2 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -2067,6 +2067,7 @@ static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) mb->cmd_tail = 0; mb->cmd_head = 0; tcmu_flush_dcache_range(mb, sizeof(*mb)); + clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); del_timer(&udev->cmd_timer);