From patchwork Wed Jun 16 11:51:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linyu Yuan X-Patchwork-Id: 461828 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,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 8B7A2C48BE5 for ; Wed, 16 Jun 2021 11:52:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6907561164 for ; Wed, 16 Jun 2021 11:52:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232596AbhFPLyV (ORCPT ); Wed, 16 Jun 2021 07:54:21 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:56019 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232546AbhFPLyT (ORCPT ); Wed, 16 Jun 2021 07:54:19 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1623844333; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=x8YM41tIK2n4ialB5PxG4YvrBi5avZ4s6tNfI+y5Hf0=; b=O41fG28PoXhjtOMxDAw9raU7jnTGUUjvDhILfaTg+xj/ilYLk9OdjNMIU9vvo29eMXwBmdqN 3n/De4c4XkeZr8bXQIKN0vXJdTAb+HTkvW7Hpx71chZXY/Lq4Jql5GZcy0CuIck6S6PLSWYv JAoMvREAnmp+f3NyGRIpA5gRnJY= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n06.prod.us-east-1.postgun.com with SMTP id 60c9e5e7f726fa4188cae770 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 16 Jun 2021 11:52:07 GMT Sender: linyyuan=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 24C4EC4338A; Wed, 16 Jun 2021 11:52:06 +0000 (UTC) Received: from localhost.localdomain (unknown [101.87.142.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: linyyuan) by smtp.codeaurora.org (Postfix) with ESMTPSA id C961CC433F1; Wed, 16 Jun 2021 11:51:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C961CC433F1 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=linyyuan@codeaurora.org From: Linyu Yuan To: Felipe Balbi , Greg Kroah-Hartman , linux-usb@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Linyu Yuan Subject: [PATCH v3] usb: gadget: eem: fix echo command packet response issue Date: Wed, 16 Jun 2021 19:51:42 +0800 Message-Id: <20210616115142.34075-1-linyyuan@codeaurora.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Linyu Yuan when receive eem echo command, it will send a response, but queue this response to the usb request which allocate from gadget device endpoint zero, and transmit the request to IN endpoint of eem interface. on dwc3 gadget, it will trigger following warning in function __dwc3_gadget_ep_queue(), if (WARN(req->dep != dep, "request %pK belongs to '%s'\n", &req->request, req->dep->name)) return -EINVAL; fix it by allocating a usb request from IN endpoint of eem interface, and transmit the usb request to same IN endpoint of eem interface. Signed-off-by: Linyu Yuan --- v3: use exist goto label 'next' v2: fix mail format and expand commit message drivers/usb/gadget/function/f_eem.c | 43 ++++++++++++++++++++++++++--- 1 file changed, 39 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c index 2cd9942707b4..5d38f29bda72 100644 --- a/drivers/usb/gadget/function/f_eem.c +++ b/drivers/usb/gadget/function/f_eem.c @@ -30,6 +30,11 @@ struct f_eem { u8 ctrl_id; }; +struct in_context { + struct sk_buff *skb; + struct usb_ep *ep; +}; + static inline struct f_eem *func_to_eem(struct usb_function *f) { return container_of(f, struct f_eem, port.func); @@ -320,9 +325,12 @@ static int eem_bind(struct usb_configuration *c, struct usb_function *f) static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req) { - struct sk_buff *skb = (struct sk_buff *)req->context; + struct in_context *ctx = req->context; - dev_kfree_skb_any(skb); + dev_kfree_skb_any(ctx->skb); + kfree(req->buf); + usb_ep_free_request(ctx->ep, req); + kfree(ctx); } /* @@ -410,7 +418,9 @@ static int eem_unwrap(struct gether *port, * b15: bmType (0 == data, 1 == command) */ if (header & BIT(15)) { - struct usb_request *req = cdev->req; + struct usb_request *req; + struct in_context *ctx; + struct usb_ep *ep; u16 bmEEMCmd; /* EEM command packet format: @@ -439,11 +449,36 @@ static int eem_unwrap(struct gether *port, skb_trim(skb2, len); put_unaligned_le16(BIT(15) | BIT(11) | len, skb_push(skb2, 2)); + + ep = port->in_ep; + req = usb_ep_alloc_request(ep, GFP_ATOMIC); + if (!req) { + dev_kfree_skb_any(skb2); + goto next; + } + + req->buf = kmalloc(skb2->len, GFP_KERNEL); + if (!req->buf) { + usb_ep_free_request(ep, req); + dev_kfree_skb_any(skb2); + goto next; + } + + ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) { + kfree(req->buf); + usb_ep_free_request(ep, req); + dev_kfree_skb_any(skb2); + goto next; + } + ctx->skb = skb2; + ctx->ep = ep; + skb_copy_bits(skb2, 0, req->buf, skb2->len); req->length = skb2->len; req->complete = eem_cmd_complete; req->zero = 1; - req->context = skb2; + req->context = ctx; if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC)) DBG(cdev, "echo response queue fail\n"); break;