From patchwork Mon Sep 21 11:20:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Neukum X-Patchwork-Id: 258485 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 0A530C43465 for ; Mon, 21 Sep 2020 11:21:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BEEBC21531 for ; Mon, 21 Sep 2020 11:21:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="IalD1rie" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726648AbgIULVR (ORCPT ); Mon, 21 Sep 2020 07:21:17 -0400 Received: from mx2.suse.de ([195.135.220.15]:58110 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726593AbgIULVQ (ORCPT ); Mon, 21 Sep 2020 07:21:16 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1600687275; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=6sv+MNNsiVmYiUMnZzQlm95iIxK3Jn1uonWRbwxA3U0=; b=IalD1rie1RRHB6Jm/i5sjNLebzxbcPMJ+Vwx0eZORie0rAGRFEGmAUb1h89xAC7PaNiLkH +TaTKgWedsvuMmt7sVCMJ1sQ69WQ1SQLsvpg4Vyvy8O5LZUak4RLt7bzqq6dcZTgNomncH n5E4xyBSOjTZdSM9jchX/1E3B+Hulec= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 5462DB202; Mon, 21 Sep 2020 11:21:51 +0000 (UTC) From: Oliver Neukum To: penguin-kernel@i-love.sakura.ne.jp, bjorn@mork.no, linux-usb@vger.kernel.org Cc: Oliver Neukum Subject: [RFC 4/8] CDC-WDM: remove use of intf->dev after potential disconnect Date: Mon, 21 Sep 2020 13:20:48 +0200 Message-Id: <20200921112052.27943-5-oneukum@suse.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200921112052.27943-1-oneukum@suse.com> References: <20200921112052.27943-1-oneukum@suse.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org After a disconnect intf->dev is not a valid pointer any longer as flush() uses it only for logging purposes logging is not worth it. Remove the dev_err() Reported-by: Tetsuo Handa Signed-off-by: Oliver Neukum --- drivers/usb/class/cdc-wdm.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index eee19532e67e..40661b9f6775 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -603,7 +603,11 @@ static int wdm_flush(struct file *file, fl_owner_t id) test_bit(WDM_DISCONNECTING, &desc->flags), WDM_FLUSH_TIMEOUT); - /* cannot dereference desc->intf if WDM_DISCONNECTING */ + /* + * to report the correct error. + * This is best effort + * We are inevitably racing with the hardware. + */ if (test_bit(WDM_DISCONNECTING, &desc->flags)) return -ENODEV; if (!rv) @@ -611,9 +615,7 @@ static int wdm_flush(struct file *file, fl_owner_t id) if (rv < 0) return -EINTR; rv = desc->werr; - if (rv < 0) - dev_err(&desc->intf->dev, "Error in flush path: %d\n", - rv); + desc->werr = 0; return usb_translate_errors(rv); }