From mboxrd@z Thu Jan 1 00:00:00 1970 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 56F77C43603 for ; Mon, 16 Dec 2019 18:29:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F689206EC for ; Mon, 16 Dec 2019 18:29:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576520958; bh=dHp+0izUy3gUt9Z11uqVhXbKnF9n8E0PvImkKYAJD0E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JHqp1e6ntzX+j+sWO0kcg8IeDlbOZpe19XR+Pi79kIcQ3fMpuBoUMESfI//XDsVDn sEQN6064xoIYElG4JhN1tl43Pd8aGByY9qrB5EAuft6YkN4OyfXCnfMHSzNPJ486Qy l+6XVtfKxZImWCiq+x3pznV1IA83PIhD/LywNt4w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731416AbfLPS3J (ORCPT ); Mon, 16 Dec 2019 13:29:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:33098 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731060AbfLPSOK (ORCPT ); Mon, 16 Dec 2019 13:14:10 -0500 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 746F421775; Mon, 16 Dec 2019 18:14:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576520049; bh=dHp+0izUy3gUt9Z11uqVhXbKnF9n8E0PvImkKYAJD0E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g7bXluZmjPbJewGQrhX9MuURjX465otivkbYcT54hDiy17l1GgWgh3gy9Y7mV1j1J 0rg4grba4/l9N27W3JzyZyVnT6dmZdN/icH/Jyq9z8OFgCGIAkEgQV0/TWu7RxHJdE bM6o2K71nJNpQ0dwETePKqosL0XVQ9OU2WTkcqXQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Himanshu Madhani , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.3 159/180] scsi: qla2xxx: Fix a race condition between aborting and completing a SCSI command Date: Mon, 16 Dec 2019 18:49:59 +0100 Message-Id: <20191216174845.839026411@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191216174806.018988360@linuxfoundation.org> References: <20191216174806.018988360@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bart Van Assche [ Upstream commit 85cffefa09e448906a6f0bc20f422d75a18675bd ] Instead of allocating a struct srb dynamically from inside .queuecommand(), set qla2xxx_driver_template.cmd_size such that struct scsi_cmnd and struct srb are contiguous. Do not call QLA_QPAIR_MARK_BUSY() / QLA_QPAIR_MARK_NOT_BUSY() for SRBs associated with SCSI commands. That is safe because scsi_remove_host() is called before queue pairs are deleted and scsi_remove_host() waits for all outstanding SCSI commands to finish. Cc: Himanshu Madhani Signed-off-by: Bart Van Assche Tested-by: Himanshu Madhani Reviewed-by: Himanshu Madhani Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/qla2xxx/qla_def.h | 1 - drivers/scsi/qla2xxx/qla_os.c | 45 ++++++---------------------------- 2 files changed, 8 insertions(+), 38 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h index 0eb1d5a790b26..ea1728fe2c768 100644 --- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -562,7 +562,6 @@ typedef struct srb { } srb_t; #define GET_CMD_SP(sp) (sp->u.scmd.cmd) -#define SET_CMD_SP(sp, cmd) (sp->u.scmd.cmd = cmd) #define GET_CMD_CTX_SP(sp) (sp->u.scmd.ctx) #define GET_CMD_SENSE_LEN(sp) \ diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 484045e4d194f..3aa2dd43945bf 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -727,7 +727,6 @@ qla2x00_sp_compl(void *ptr, int res) cmd->scsi_done(cmd); if (comp) complete(comp); - qla2x00_rel_sp(sp); } void @@ -832,7 +831,6 @@ qla2xxx_qpair_sp_compl(void *ptr, int res) cmd->scsi_done(cmd); if (comp) complete(comp); - qla2xxx_rel_qpair_sp(sp->qpair, sp); } static int @@ -925,9 +923,8 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) else goto qc24_target_busy; - sp = qla2x00_get_sp(vha, fcport, GFP_ATOMIC); - if (!sp) - goto qc24_host_busy; + sp = scsi_cmd_priv(cmd); + qla2xxx_init_sp(sp, vha, vha->hw->base_qpair, fcport); sp->u.scmd.cmd = cmd; sp->type = SRB_SCSI_CMD; @@ -948,9 +945,6 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) qc24_host_busy_free_sp: sp->free(sp); -qc24_host_busy: - return SCSI_MLQUEUE_HOST_BUSY; - qc24_target_busy: return SCSI_MLQUEUE_TARGET_BUSY; @@ -1011,9 +1005,8 @@ qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd, else goto qc24_target_busy; - sp = qla2xxx_get_qpair_sp(vha, qpair, fcport, GFP_ATOMIC); - if (!sp) - goto qc24_host_busy; + sp = scsi_cmd_priv(cmd); + qla2xxx_init_sp(sp, vha, qpair, fcport); sp->u.scmd.cmd = cmd; sp->type = SRB_SCSI_CMD; @@ -1037,9 +1030,6 @@ qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd, qc24_host_busy_free_sp: sp->free(sp); -qc24_host_busy: - return SCSI_MLQUEUE_HOST_BUSY; - qc24_target_busy: return SCSI_MLQUEUE_TARGET_BUSY; @@ -1280,10 +1270,8 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd) int ret; unsigned int id; uint64_t lun; - unsigned long flags; int rval; struct qla_hw_data *ha = vha->hw; - struct qla_qpair *qpair; if (qla2x00_isp_reg_stat(ha)) { ql_log(ql_log_info, vha, 0x8042, @@ -1295,29 +1283,11 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd) if (ret != 0) return ret; - sp = (srb_t *) CMD_SP(cmd); - if (!sp) - return SUCCESS; + sp = scsi_cmd_priv(cmd); - qpair = sp->qpair; - if (!qpair) - return SUCCESS; - - spin_lock_irqsave(qpair->qp_lock_ptr, flags); - if (sp->type != SRB_SCSI_CMD || GET_CMD_SP(sp) != cmd) { - /* there's a chance an interrupt could clear - the ptr as part of done & free */ - spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); - return SUCCESS; - } - - /* Get a reference to the sp and drop the lock. */ - if (sp_get(sp)){ - /* ref_count is already 0 */ - spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); + /* Return if the command has already finished. */ + if (sp_get(sp)) return SUCCESS; - } - spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); id = cmd->device->id; lun = cmd->device->lun; @@ -7197,6 +7167,7 @@ struct scsi_host_template qla2xxx_driver_template = { .supported_mode = MODE_INITIATOR, .track_queue_depth = 1, + .cmd_size = sizeof(srb_t), }; static const struct pci_error_handlers qla2xxx_err_handler = { -- 2.20.1