From patchwork Sat Mar 11 14:40:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 13170888 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C284C6FD1C for ; Sat, 11 Mar 2023 15:19:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229791AbjCKPTX (ORCPT ); Sat, 11 Mar 2023 10:19:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230001AbjCKPTW (ORCPT ); Sat, 11 Mar 2023 10:19:22 -0500 Received: from mailout1.hostsharing.net (mailout1.hostsharing.net [83.223.95.204]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6733D5F6FD; Sat, 11 Mar 2023 07:19:20 -0800 (PST) Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL Global TLS RSA4096 SHA256 2022 CA1" (verified OK)) by mailout1.hostsharing.net (Postfix) with ESMTPS id 8FB3710190FD0; Sat, 11 Mar 2023 16:19:18 +0100 (CET) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 6A9DC601663B; Sat, 11 Mar 2023 16:19:18 +0100 (CET) X-Mailbox-Line: From 7a5c7104fb6a3016dbaec1c5d0ed34619ea11a0c Mon Sep 17 00:00:00 2001 Message-Id: <7a5c7104fb6a3016dbaec1c5d0ed34619ea11a0c.1678543498.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Sat, 11 Mar 2023 15:40:16 +0100 Subject: [PATCH v4 16/17] cxl/pci: Simplify CDAT retrieval error path To: Bjorn Helgaas , Dan Williams , linux-pci@vger.kernel.org, linux-cxl@vger.kernel.org Cc: Gregory Price , Ira Weiny , Jonathan Cameron , Alison Schofield , Vishal Verma , Dave Jiang , "Li, Ming" , Hillf Danton , Ben Widawsky , Alexey Kardashevskiy , Davidlohr Bueso , linuxarm@huawei.com Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Dave Jiang The cdat.table and cdat.length fields in struct cxl_port are set before CDAT retrieval and must therefore be unset on failure. Simplify by setting only on success. Suggested-by: Jonathan Cameron Link: https://lore.kernel.org/linux-cxl/20230209113422.00007017@Huawei.com/ Signed-off-by: Dave Jiang [lukas: rebase and rephrase commit message] Signed-off-by: Lukas Wunner Reviewed-by: Ira Weiny Reviewed-by: Jonathan Cameron --- Changes v3 -> v4: * Newly added patch in v4 on popular request (Jonathan, Dave) drivers/cxl/core/pci.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index c868f4a2f1de..0609bd629073 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -475,10 +475,10 @@ static int cxl_cdat_get_length(struct device *dev, static int cxl_cdat_read_table(struct device *dev, struct pci_doe_mb *cdat_doe, - struct cxl_cdat *cdat) + void *cdat_table, size_t *cdat_length) { - size_t length = cdat->length; - __le32 *data = cdat->table; + size_t length = *cdat_length; + __le32 *data = cdat_table; int entry_handle = 0; do { @@ -522,7 +522,7 @@ static int cxl_cdat_read_table(struct device *dev, } while (entry_handle != CXL_DOE_TABLE_ACCESS_LAST_ENTRY); /* Length in CDAT header may exceed concatenation of CDAT entries */ - cdat->length -= length; + *cdat_length -= length; return 0; } @@ -542,6 +542,7 @@ void read_cdat_data(struct cxl_port *port) struct cxl_dev_state *cxlds = cxlmd->cxlds; struct pci_dev *pdev = to_pci_dev(cxlds->dev); size_t cdat_length; + void *cdat_table; int rc; cdat_doe = pci_find_doe_mailbox(pdev, PCI_DVSEC_VENDOR_ID_CXL, @@ -558,19 +559,19 @@ void read_cdat_data(struct cxl_port *port) return; } - port->cdat.table = devm_kzalloc(dev, cdat_length, GFP_KERNEL); - if (!port->cdat.table) + cdat_table = devm_kzalloc(dev, cdat_length, GFP_KERNEL); + if (!cdat_table) return; - port->cdat.length = cdat_length; - rc = cxl_cdat_read_table(dev, cdat_doe, &port->cdat); + rc = cxl_cdat_read_table(dev, cdat_doe, cdat_table, &cdat_length); if (rc) { /* Don't leave table data allocated on error */ - devm_kfree(dev, port->cdat.table); - port->cdat.table = NULL; - port->cdat.length = 0; + devm_kfree(dev, cdat_table); dev_err(dev, "CDAT data read error\n"); } + + port->cdat.table = cdat_table; + port->cdat.length = cdat_length; } EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL);