From patchwork Tue Sep 26 19:37:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Kurapati X-Patchwork-Id: 13399635 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D3DAB4A3F for ; Tue, 26 Sep 2023 19:37:36 +0000 (UTC) Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73BA4FC; Tue, 26 Sep 2023 12:37:35 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38QIdAjH029558; Tue, 26 Sep 2023 19:37:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=AGrA3Vzkw7tm3/V6u26H5AwPjK+SczZwFde78qFLu6Y=; b=CZ0o6/QM1iM0BSmYrsgHygYZEYJpjziCmpOQwQIlN3ybAOop9iKZNuXlauNA7FzH8Y9i rPK1QPUvoyp+mLe7DwUBt9LyRsWl3cIwxnxZto+XXdaU19tnXKph6cS0/2jb/aQpkQPG 8e2hwyARqke4Fd5VT5PCPMadX6nHyxa1mBsr2H/OVG5hrVTbYM4zP40fDMKcWUdwJudB vd0AKGyEw4FLWHmgBF4yUfyGF03xQ+JwHDAFHjYN8lnUpNXEF+yMfakPeu9PqcO0ehwr OcukCOa/88FO001nct31Y6ES+6aVqkeioOSfO+aoi1aD1VE+J+GxYXF7w2g3XR1F4p03 XA== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tc179gtfe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 26 Sep 2023 19:37:24 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 38QJbNg8016845 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 26 Sep 2023 19:37:23 GMT Received: from hu-kriskura-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Tue, 26 Sep 2023 12:37:19 -0700 From: Krishna Kurapati To: Greg Kroah-Hartman , Alan Stern , Francesco Dolcini , Badhri Jagan Sridharan , Michael Grzeschik , Ivan Orlov CC: , , , , , Krishna Kurapati Subject: [PATCH v4] usb: gadget: udc: Handle gadget_connect failure during bind operation Date: Wed, 27 Sep 2023 01:07:08 +0530 Message-ID: <20230926193708.22405-1-quic_kriskura@quicinc.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 2wuu3E_Pl2tzHx7c1mh6kerPepCRBwQp X-Proofpoint-ORIG-GUID: 2wuu3E_Pl2tzHx7c1mh6kerPepCRBwQp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-26_13,2023-09-26_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=948 clxscore=1011 spamscore=0 bulkscore=0 priorityscore=1501 adultscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2309260167 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net In the event, gadget_connect call (which invokes pullup) fails, propagate the error to udc bind operation which inturn sends the error to configfs. The userspace can then retry enumeartion if it chooses to. Signed-off-by: Krishna Kurapati --- Changes in v4: Fixed mutex locking imbalance during connect_control failure Link to v3: https://lore.kernel.org/all/20230510075252.31023-3-quic_kriskura@quicinc.com/ drivers/usb/gadget/udc/core.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 7d49d8a0b00c..53af25a333a1 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1125,12 +1125,16 @@ EXPORT_SYMBOL_GPL(usb_gadget_set_state); /* ------------------------------------------------------------------------- */ /* Acquire connect_lock before calling this function. */ -static void usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc->connect_lock) +static int usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc->connect_lock) { + int ret; + if (udc->vbus) - usb_gadget_connect_locked(udc->gadget); + ret = usb_gadget_connect_locked(udc->gadget); else - usb_gadget_disconnect_locked(udc->gadget); + ret = usb_gadget_disconnect_locked(udc->gadget); + + return ret; } static void vbus_event_work(struct work_struct *work) @@ -1604,12 +1608,23 @@ static int gadget_bind_driver(struct device *dev) } usb_gadget_enable_async_callbacks(udc); udc->allow_connect = true; - usb_udc_connect_control_locked(udc); + ret = usb_udc_connect_control_locked(udc); + if (ret) { + mutex_unlock(&udc->connect_lock); + goto err_connect_control; + } + mutex_unlock(&udc->connect_lock); kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); return 0; + err_connect_control: + usb_gadget_disable_async_callbacks(udc); + if (gadget->irq) + synchronize_irq(gadget->irq); + usb_gadget_udc_stop_locked(udc); + err_start: driver->unbind(udc->gadget);