From patchwork Thu Jan 31 14:53:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Pietrasiewicz X-Patchwork-Id: 10790733 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 645DD184E for ; Thu, 31 Jan 2019 14:53:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 59D7231019 for ; Thu, 31 Jan 2019 14:53:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 583913112A; Thu, 31 Jan 2019 14:53:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 00941310FB for ; Thu, 31 Jan 2019 14:53:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732019AbfAaOxx (ORCPT ); Thu, 31 Jan 2019 09:53:53 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:44400 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732001AbfAaOxw (ORCPT ); Thu, 31 Jan 2019 09:53:52 -0500 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: andrzej.p) with ESMTPSA id 0AC9A27FEF9 From: Andrzej Pietrasiewicz To: linux-usb@vger.kernel.org Cc: Felipe Balbi , Michal Nazarewicz , kernel@collabora.com Subject: [PATCH 2/2] usb: gadget: f_fs: preserve wMaxPacketSize across usb_ep_autoconfig() call Date: Thu, 31 Jan 2019 15:53:40 +0100 Message-Id: <20190131145340.9820-3-andrzej.p@collabora.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190131145340.9820-1-andrzej.p@collabora.com> References: <20190131145340.9820-1-andrzej.p@collabora.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP usb_ep_autoconfig() treats the passed descriptor as if it were an fs descriptor. In particular, for bulk endpoints, it clips wMaxPacketSize to 64. This patch preserves the original value. Signed-off-by: Andrzej Pietrasiewicz --- drivers/usb/gadget/function/f_fs.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 1e5430438703..66a2c165b4b7 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -2843,12 +2843,18 @@ static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, struct usb_request *req; struct usb_ep *ep; u8 bEndpointAddress; + u16 wMaxPacketSize; /* * We back up bEndpointAddress because autoconfig overwrites * it with physical endpoint address. */ bEndpointAddress = ds->bEndpointAddress; + /* + * We back up wMaxPacketSize because autoconfig treats + * endpoint descriptors as if they were full speed. + */ + wMaxPacketSize = ds->wMaxPacketSize; pr_vdebug("autoconfig\n"); ep = usb_ep_autoconfig(func->gadget, ds); if (unlikely(!ep)) @@ -2869,6 +2875,11 @@ static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, */ if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) ds->bEndpointAddress = bEndpointAddress; + /* + * Restore wMaxPacketSize which was potentially + * overwritten by autoconfig. + */ + ds->wMaxPacketSize = wMaxPacketSize; } ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength);