From patchwork Wed Jan 22 09:29:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 233378 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=-5.7 required=3.0 tests=DATE_IN_PAST_03_06, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 D54CDC3F68F for ; Wed, 22 Jan 2020 13:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AC1FC205F4 for ; Wed, 22 Jan 2020 13:29:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579699753; bh=0s1L4NZLSb/p28c3fPgPLD6XN3jAQhqpj9KMFVolbOw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vteN4RwBVvT+d+RwAoiKD8e7ArUvpc7avtKSR3Cr3i/w/q9eA++hg3z62MqlquhVT P7M6I2NJJwZrOOVdUtsFvVxZ/XuapgOc5dQzHLeDpypLC3N7apz6ze4vtga/JYO2NF n3SqRhzA8ocbN3JAWdi002Els5atZbAZr5hESOWk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731796AbgAVN1s (ORCPT ); Wed, 22 Jan 2020 08:27:48 -0500 Received: from mail.kernel.org ([198.145.29.99]:49390 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726103AbgAVN1q (ORCPT ); Wed, 22 Jan 2020 08:27:46 -0500 Received: from localhost (unknown [84.241.205.26]) (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 891182467B; Wed, 22 Jan 2020 13:27:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579699665; bh=0s1L4NZLSb/p28c3fPgPLD6XN3jAQhqpj9KMFVolbOw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qHB9tReNBFPnhQgP9YoY5q+3yyu2TsfAIEjexiF60RN6KCIf8X65fkTM0zU4YAALh Tm5KFBh7DpnRPL5IvbEgjrCNpf+JNThBBF96NczI5iGtbAFRDJXWTeIDebU0lw6KKp pPeKLngI5dgZOClc5H1dzf6b2cUA9PpYGfTx4hiw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dick Kennedy , James Smart , "Martin K. Petersen" Subject: [PATCH 5.4 212/222] scsi: lpfc: Fix hdwq sgl locks and irq handling Date: Wed, 22 Jan 2020 10:29:58 +0100 Message-Id: <20200122092848.874374835@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200122092833.339495161@linuxfoundation.org> References: <20200122092833.339495161@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: James Smart commit a4c21acca2be6729ecbe72eda9b08092725b0a77 upstream. Many of the sgl-per-hdwq paths are locking with spin_lock_irq() and spin_unlock_irq() and may unwittingly raising irq when it shouldn't. Hard deadlocks were seen around lpfc_scsi_prep_cmnd(). Fix by converting the locks to irqsave/irqrestore. Fixes: d79c9e9d4b3d ("scsi: lpfc: Support dynamic unbounded SGL lists on G7 hardware.") Link: https://lore.kernel.org/r/20190922035906.10977-16-jsmart2021@gmail.com Signed-off-by: Dick Kennedy Signed-off-by: James Smart Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/lpfc/lpfc_sli.c | 38 ++++++++++++++++++++++---------------- 1 file changed, 22 insertions(+), 16 deletions(-) --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -20414,8 +20414,9 @@ lpfc_get_sgl_per_hdwq(struct lpfc_hba *p struct sli4_hybrid_sgl *allocated_sgl = NULL; struct lpfc_sli4_hdw_queue *hdwq = lpfc_buf->hdwq; struct list_head *buf_list = &hdwq->sgl_list; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); if (likely(!list_empty(buf_list))) { /* break off 1 chunk from the sgl_list */ @@ -20427,7 +20428,7 @@ lpfc_get_sgl_per_hdwq(struct lpfc_hba *p } } else { /* allocate more */ - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); tmp = kmalloc_node(sizeof(*tmp), GFP_ATOMIC, cpu_to_node(smp_processor_id())); if (!tmp) { @@ -20449,7 +20450,7 @@ lpfc_get_sgl_per_hdwq(struct lpfc_hba *p return NULL; } - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); list_add_tail(&tmp->list_node, &lpfc_buf->dma_sgl_xtra_list); } @@ -20457,7 +20458,7 @@ lpfc_get_sgl_per_hdwq(struct lpfc_hba *p struct sli4_hybrid_sgl, list_node); - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); return allocated_sgl; } @@ -20481,8 +20482,9 @@ lpfc_put_sgl_per_hdwq(struct lpfc_hba *p struct sli4_hybrid_sgl *tmp = NULL; struct lpfc_sli4_hdw_queue *hdwq = lpfc_buf->hdwq; struct list_head *buf_list = &hdwq->sgl_list; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); if (likely(!list_empty(&lpfc_buf->dma_sgl_xtra_list))) { list_for_each_entry_safe(list_entry, tmp, @@ -20495,7 +20497,7 @@ lpfc_put_sgl_per_hdwq(struct lpfc_hba *p rc = -EINVAL; } - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); return rc; } @@ -20516,8 +20518,9 @@ lpfc_free_sgl_per_hdwq(struct lpfc_hba * struct list_head *buf_list = &hdwq->sgl_list; struct sli4_hybrid_sgl *list_entry = NULL; struct sli4_hybrid_sgl *tmp = NULL; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); /* Free sgl pool */ list_for_each_entry_safe(list_entry, tmp, @@ -20529,7 +20532,7 @@ lpfc_free_sgl_per_hdwq(struct lpfc_hba * kfree(list_entry); } - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); } /** @@ -20553,8 +20556,9 @@ lpfc_get_cmd_rsp_buf_per_hdwq(struct lpf struct fcp_cmd_rsp_buf *allocated_buf = NULL; struct lpfc_sli4_hdw_queue *hdwq = lpfc_buf->hdwq; struct list_head *buf_list = &hdwq->cmd_rsp_buf_list; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); if (likely(!list_empty(buf_list))) { /* break off 1 chunk from the list */ @@ -20567,7 +20571,7 @@ lpfc_get_cmd_rsp_buf_per_hdwq(struct lpf } } else { /* allocate more */ - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); tmp = kmalloc_node(sizeof(*tmp), GFP_ATOMIC, cpu_to_node(smp_processor_id())); if (!tmp) { @@ -20594,7 +20598,7 @@ lpfc_get_cmd_rsp_buf_per_hdwq(struct lpf tmp->fcp_rsp = (struct fcp_rsp *)((uint8_t *)tmp->fcp_cmnd + sizeof(struct fcp_cmnd)); - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); list_add_tail(&tmp->list_node, &lpfc_buf->dma_cmd_rsp_list); } @@ -20602,7 +20606,7 @@ lpfc_get_cmd_rsp_buf_per_hdwq(struct lpf struct fcp_cmd_rsp_buf, list_node); - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); return allocated_buf; } @@ -20627,8 +20631,9 @@ lpfc_put_cmd_rsp_buf_per_hdwq(struct lpf struct fcp_cmd_rsp_buf *tmp = NULL; struct lpfc_sli4_hdw_queue *hdwq = lpfc_buf->hdwq; struct list_head *buf_list = &hdwq->cmd_rsp_buf_list; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); if (likely(!list_empty(&lpfc_buf->dma_cmd_rsp_list))) { list_for_each_entry_safe(list_entry, tmp, @@ -20641,7 +20646,7 @@ lpfc_put_cmd_rsp_buf_per_hdwq(struct lpf rc = -EINVAL; } - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); return rc; } @@ -20662,8 +20667,9 @@ lpfc_free_cmd_rsp_buf_per_hdwq(struct lp struct list_head *buf_list = &hdwq->cmd_rsp_buf_list; struct fcp_cmd_rsp_buf *list_entry = NULL; struct fcp_cmd_rsp_buf *tmp = NULL; + unsigned long iflags; - spin_lock_irq(&hdwq->hdwq_lock); + spin_lock_irqsave(&hdwq->hdwq_lock, iflags); /* Free cmd_rsp buf pool */ list_for_each_entry_safe(list_entry, tmp, @@ -20676,5 +20682,5 @@ lpfc_free_cmd_rsp_buf_per_hdwq(struct lp kfree(list_entry); } - spin_unlock_irq(&hdwq->hdwq_lock); + spin_unlock_irqrestore(&hdwq->hdwq_lock, iflags); }