From patchwork Tue May 25 12:24:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= X-Patchwork-Id: 12278639 X-Patchwork-Delegate: bhelgaas@google.com 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 857A8C2B9F8 for ; Tue, 25 May 2021 12:24:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 63C60613F5 for ; Tue, 25 May 2021 12:24:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232518AbhEYM0T (ORCPT ); Tue, 25 May 2021 08:26:19 -0400 Received: from mail-pg1-f172.google.com ([209.85.215.172]:41757 "EHLO mail-pg1-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232504AbhEYM0T (ORCPT ); Tue, 25 May 2021 08:26:19 -0400 Received: by mail-pg1-f172.google.com with SMTP id r1so7751181pgk.8 for ; Tue, 25 May 2021 05:24:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=F6bpNTp63J2JCwxOjLKFQTUbwufk/UzqLJ7gX6xEOkI=; b=tpkbywUqgcV1WCwhdg9KbYM+4TszPN4gBlmQN8xhnDS5M7t3Eu/DWrBr4J0P2VkVz6 fYRXL6C/7iIFEFiFdJMDn5apUQwR2pEX5wi7dmVOADkLx764bQV6dVAIpcrcY+vStz9h wVTUhGsysX2hgL3y/6ZrSpxmgrz+dh0JzHyOfOCvJaht+j6NpR6NN/aBBZwhe71p67FI WOt/y1c0qDGTXNE8mJkw//fVPbQO/AXFR7Ne9s4jZUTRWs0feRZGr7nhxbqtTkhgUBpz d+Ui72xtZd4guvDKGmoil+SB5k99jjUQ9B54C55AjVlcNf3xFPN72Mu0R3iKL6CO71+D Dg4Q== X-Gm-Message-State: AOAM532Aw70c3sPGIouOf++TiPjC4yujmfXDoztIzwIqh7tUIgvDGKTN 39bmKYMDVbfTZ7skVz6vmO0ovHhBTGgT4g== X-Google-Smtp-Source: ABdhPJyOgfBlKeuhzFjGqOxDN1Rj1C0L6TBW5Aojc3oqYI2dLxzJd9OxPjj+Rv5wRLA3mK3kKufosg== X-Received: by 2002:a05:6a00:1992:b029:2df:b93b:49a with SMTP id d18-20020a056a001992b02902dfb93b049amr29793945pfl.11.1621945488345; Tue, 25 May 2021 05:24:48 -0700 (PDT) Received: from workstation.lan ([95.155.85.46]) by smtp.gmail.com with ESMTPSA id u1sm14220258pfc.63.2021.05.25.05.24.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 05:24:48 -0700 (PDT) From: =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Logan Gunthorpe , Joe Perches , "Oliver O'Halloran" , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Tyrel Datwyler , Russell Currey , Kurt Schwemmer , Vidya Sagar , Xiongfeng Wang , linux-pci@vger.kernel.org Subject: [PATCH v4 5/5] PCI/sysfs: Only show value when driver_override is not NULL Date: Tue, 25 May 2021 12:24:01 +0000 Message-Id: <20210525122401.206136-5-kw@linux.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210525122401.206136-1-kw@linux.com> References: <20210525122401.206136-1-kw@linux.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Only expose the value of the "driver_override" variable through the corresponding sysfs object when a value is actually set. Signed-off-by: Krzysztof Wilczyński Reviewed-by: Logan Gunthorpe --- Changes in v2: None. Changes in v3: Added Logan Gunthorpe's "Reviewed-by". Changes in v4: None. drivers/pci/pci-sysfs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 5d63df7c1820..4e9f582ca10f 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -580,10 +580,11 @@ static ssize_t driver_override_show(struct device *dev, struct device_attribute *attr, char *buf) { struct pci_dev *pdev = to_pci_dev(dev); - ssize_t len; + ssize_t len = 0; device_lock(dev); - len = sysfs_emit(buf, "%s\n", pdev->driver_override); + if (pdev->driver_override) + len = sysfs_emit(buf, "%s\n", pdev->driver_override); device_unlock(dev); return len; }