From patchwork Tue Sep 7 01:09:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linyu Yuan X-Patchwork-Id: 507768 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, 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 1E430C433EF for ; Tue, 7 Sep 2021 01:09:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EDB3260EFD for ; Tue, 7 Sep 2021 01:09:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234495AbhIGBKy (ORCPT ); Mon, 6 Sep 2021 21:10:54 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:40848 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229975AbhIGBKy (ORCPT ); Mon, 6 Sep 2021 21:10:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1630976989; x=1662512989; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WxBQfNZtaHmSdhkF9eYwr9Ln0YRcG+x8n+X0Sk5I3m8=; b=OwHXrTRWWjFhQlKy4uHqsfvgYQkZWcLCXOHkej1zaiEuD+oHEauFIFEF a5cXUmprIYhx/0DwDKFwluMCMTAhScb2rQkBygw4lF2Y2fFXObFXVziKF tDHO0meqmRtc3wyvbXUcCcK6WNEhUWiHHXFmjIj6AlNLMln/VplMY0t/5 s=; Received: from ironmsg07-lv.qualcomm.com ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 06 Sep 2021 18:09:49 -0700 X-QCInternal: smtphost Received: from nalasex01b.na.qualcomm.com ([10.47.209.197]) by ironmsg07-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2021 18:09:48 -0700 Received: from linyyuan-gv.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.7; Mon, 6 Sep 2021 18:09:46 -0700 From: Linyu Yuan To: Felipe Balbi , Greg Kroah-Hartman CC: , Linyu Yuan Subject: [PATCH v5 1/3] usb: gadget: configfs: avoid list move operation of usb_function Date: Tue, 7 Sep 2021 09:09:35 +0800 Message-ID: <1630976977-13938-2-git-send-email-quic_linyyuan@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1630976977-13938-1-git-send-email-quic_linyyuan@quicinc.com> References: <1630976977-13938-1-git-send-email-quic_linyyuan@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org add a new list which link all usb_function at configfs layers, it means that after link a function a configuration, from configfs layer, we can still found all functions, it will allow trace all functions from configfs. Reported-by: kernel test robot Signed-off-by: Linyu Yuan --- v2: fix unused cfg variable warning v3: add struct inside configfs.c v4: no change v5: lost v2 fix, add it again drivers/usb/gadget/configfs.c | 55 ++++++++++++++++++++++++------------------- 1 file changed, 31 insertions(+), 24 deletions(-) diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c index 477e72a..5b2e6f9 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -58,6 +58,11 @@ static inline struct gadget_info *to_gadget_info(struct config_item *item) return container_of(to_config_group(item), struct gadget_info, group); } +struct config_usb_function { + struct list_head list; + struct usb_function *f; +}; + struct config_usb_cfg { struct config_group group; struct config_group strings_group; @@ -420,7 +425,7 @@ static int config_usb_cfg_link( struct usb_function_instance *fi = container_of(group, struct usb_function_instance, group); struct usb_function_instance *a_fi; - struct usb_function *f; + struct config_usb_function *cf; int ret; mutex_lock(&gi->lock); @@ -438,21 +443,29 @@ static int config_usb_cfg_link( goto out; } - list_for_each_entry(f, &cfg->func_list, list) { - if (f->fi == fi) { + list_for_each_entry(cf, &cfg->func_list, list) { + if (cf->f->fi == fi) { ret = -EEXIST; goto out; } } - f = usb_get_function(fi); - if (IS_ERR(f)) { - ret = PTR_ERR(f); + cf = kzalloc(sizeof(*cf), GFP_KERNEL); + if (!cf) { + ret = -ENOMEM; + goto out; + } + INIT_LIST_HEAD(&cf->list); + + cf->f = usb_get_function(fi); + if (IS_ERR(cf->f)) { + ret = PTR_ERR(cf->f); + kfree(cf); goto out; } /* stash the function until we bind it to the gadget */ - list_add_tail(&f->list, &cfg->func_list); + list_add_tail(&cf->list, &cfg->func_list); ret = 0; out: mutex_unlock(&gi->lock); @@ -470,7 +483,7 @@ static void config_usb_cfg_unlink( struct config_group *group = to_config_group(usb_func_ci); struct usb_function_instance *fi = container_of(group, struct usb_function_instance, group); - struct usb_function *f; + struct config_usb_function *cf; /* * ideally I would like to forbid to unlink functions while a gadget is @@ -483,10 +496,11 @@ static void config_usb_cfg_unlink( unregister_gadget(gi); WARN_ON(gi->composite.gadget_driver.udc_name); - list_for_each_entry(f, &cfg->func_list, list) { - if (f->fi == fi) { - list_del(&f->list); - usb_put_function(f); + list_for_each_entry(cf, &cfg->func_list, list) { + if (cf->f->fi == fi) { + list_del(&cf->list); + usb_put_function(cf->f); + kfree(cf); mutex_unlock(&gi->lock); return; } @@ -1257,13 +1271,10 @@ static void purge_configs_funcs(struct gadget_info *gi) list_for_each_entry(c, &gi->cdev.configs, list) { struct usb_function *f, *tmp; - struct config_usb_cfg *cfg; - - cfg = container_of(c, struct config_usb_cfg, c); list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { - list_move(&f->list, &cfg->func_list); + list_del(&f->list); if (f->unbind) { dev_dbg(&gi->cdev.gadget->dev, "unbind function '%s'/%p\n", @@ -1371,8 +1382,7 @@ static int configfs_composite_bind(struct usb_gadget *gadget, /* Go through all configs, attach all functions */ list_for_each_entry(c, &gi->cdev.configs, list) { struct config_usb_cfg *cfg; - struct usb_function *f; - struct usb_function *tmp; + struct config_usb_function *cf, *tmp; struct gadget_config_name *cn; if (gadget_is_otg(gadget)) @@ -1396,13 +1406,10 @@ static int configfs_composite_bind(struct usb_gadget *gadget, c->iConfiguration = s[0].id; } - list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { - list_del(&f->list); - ret = usb_add_function(c, f); - if (ret) { - list_add(&f->list, &cfg->func_list); + list_for_each_entry_safe(cf, tmp, &cfg->func_list, list) { + ret = usb_add_function(c, cf->f); + if (ret) goto err_purge_funcs; - } } ret = usb_gadget_check_config(cdev->gadget); if (ret)