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Wed, 28 Feb 2018 04:59:19 -0500 Received: from fllnx210.ext.ti.com ([198.47.19.17]:60781 "EHLO fllnx210.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752066AbeB1J7S (ORCPT ); Wed, 28 Feb 2018 04:59:18 -0500 Subject: Re: [PATCH] usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume To: Felipe Balbi CC: , References: <1519730526-22274-1-git-send-email-rogerq@ti.com> <87sh9l5z4l.fsf@linux.intel.com> From: Roger Quadros Message-ID: <94cd6377-1327-2309-8d69-6ab0de2bdfd4@ti.com> Date: Wed, 28 Feb 2018 11:59:14 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <87sh9l5z4l.fsf@linux.intel.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-GB Content-Transfer-Encoding: 8bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-usb-owner@vger.kernel.org X-Mailing-List: linux-usb@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Felipe, On 28/02/18 09:53, Felipe Balbi wrote: > > Hi, > > Roger Quadros writes: >> In the following test we get stuck by sleeping forever in _dwc3_set_mode() >> after which dual-role switching doesn't work. >> >> On dra7-evm's dual-role port, >> - Load g_zero gadget driver and enumerate to host >> - suspend to mem >> - disconnect USB cable to host and connect otg cable with Pen drive in it. >> - resume system >> - we sleep indefinitely in _dwc3_set_mode due to. >> dwc3_gadget_exit()->usb_del_gadget_udc()->udc_stop()-> >> dwc3_gadget_stop()->wait_event_lock_irq() >> >> Let's clear the DWC3_EP_END_TRANSFER_PENDING flag on all endpoints >> so we don't wait in dwc3_gadget_stop(). >> >> Signed-off-by: Roger Quadros >> --- >> drivers/usb/dwc3/gadget.c | 14 ++++++++++++++ >> 1 file changed, 14 insertions(+) >> >> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c >> index 2bda4eb..0a360da 100644 >> --- a/drivers/usb/dwc3/gadget.c >> +++ b/drivers/usb/dwc3/gadget.c >> @@ -3273,6 +3273,20 @@ int dwc3_gadget_init(struct dwc3 *dwc) >> >> void dwc3_gadget_exit(struct dwc3 *dwc) >> { >> + int epnum; >> + unsigned long flags; >> + >> + spin_lock_irqsave(&dwc->lock, flags); >> + for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) { >> + struct dwc3_ep *dep = dwc->eps[epnum]; >> + >> + if (!dep) >> + continue; >> + >> + dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING; >> + } >> + spin_unlock_irqrestore(&dwc->lock, flags); >> + >> usb_del_gadget_udc(&dwc->gadget); >> dwc3_gadget_free_endpoints(dwc); > > free endpoints is a better place for this. It's already going to free > the memory anyway. Might as well clear all flags to 0 there. > But it won't solve the deadlock issue. Since dwc3_gadget_free_endpoints() is called after usb_del_gadget_udc() and the deadlock happens when usb_del_gadget_udc()->udc_stop()->dwc3_gadget_stop()->wait_event_lock_irq() and DWC3_EP_END_TRANSFER_PENDING flag is set. -- cheers, -roger Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume From: Roger Quadros Message-Id: <94cd6377-1327-2309-8d69-6ab0de2bdfd4@ti.com> Date: Wed, 28 Feb 2018 11:59:14 +0200 To: Felipe Balbi Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org List-ID: RmVsaXBlLAoKT24gMjgvMDIvMTggMDk6NTMsIEZlbGlwZSBCYWxiaSB3cm90ZToKPiAKPiBIaSwK PiAKPiBSb2dlciBRdWFkcm9zIDxyb2dlcnFAdGkuY29tPiB3cml0ZXM6Cj4+IEluIHRoZSBmb2xs b3dpbmcgdGVzdCB3ZSBnZXQgc3R1Y2sgYnkgc2xlZXBpbmcgZm9yZXZlciBpbiBfZHdjM19zZXRf bW9kZSgpCj4+IGFmdGVyIHdoaWNoIGR1YWwtcm9sZSBzd2l0Y2hpbmcgZG9lc24ndCB3b3JrLgo+ Pgo+PiBPbiBkcmE3LWV2bSdzIGR1YWwtcm9sZSBwb3J0LAo+PiAtIExvYWQgZ196ZXJvIGdhZGdl dCBkcml2ZXIgYW5kIGVudW1lcmF0ZSB0byBob3N0Cj4+IC0gc3VzcGVuZCB0byBtZW0KPj4gLSBk aXNjb25uZWN0IFVTQiBjYWJsZSB0byBob3N0IGFuZCBjb25uZWN0IG90ZyBjYWJsZSB3aXRoIFBl biBkcml2ZSBpbiBpdC4KPj4gLSByZXN1bWUgc3lzdGVtCj4+IC0gd2Ugc2xlZXAgaW5kZWZpbml0 ZWx5IGluIF9kd2MzX3NldF9tb2RlIGR1ZSB0by4KPj4gICBkd2MzX2dhZGdldF9leGl0KCktPnVz Yl9kZWxfZ2FkZ2V0X3VkYygpLT51ZGNfc3RvcCgpLT4KPj4gCWR3YzNfZ2FkZ2V0X3N0b3AoKS0+ d2FpdF9ldmVudF9sb2NrX2lycSgpCj4+Cj4+IExldCdzIGNsZWFyIHRoZSBEV0MzX0VQX0VORF9U UkFOU0ZFUl9QRU5ESU5HIGZsYWcgb24gYWxsIGVuZHBvaW50cwo+PiBzbyB3ZSBkb24ndCB3YWl0 IGluIGR3YzNfZ2FkZ2V0X3N0b3AoKS4KPj4KPj4gU2lnbmVkLW9mZi1ieTogUm9nZXIgUXVhZHJv cyA8cm9nZXJxQHRpLmNvbT4KPj4gLS0tCj4+ICBkcml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jIHwg MTQgKysrKysrKysrKysrKysKPj4gIDEgZmlsZSBjaGFuZ2VkLCAxNCBpbnNlcnRpb25zKCspCj4+ Cj4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jIGIvZHJpdmVycy91c2Iv ZHdjMy9nYWRnZXQuYwo+PiBpbmRleCAyYmRhNGViLi4wYTM2MGRhIDEwMDY0NAo+PiAtLS0gYS9k cml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jCj4+ICsrKyBiL2RyaXZlcnMvdXNiL2R3YzMvZ2FkZ2V0 LmMKPj4gQEAgLTMyNzMsNiArMzI3MywyMCBAQCBpbnQgZHdjM19nYWRnZXRfaW5pdChzdHJ1Y3Qg ZHdjMyAqZHdjKQo+PiAgCj4+ICB2b2lkIGR3YzNfZ2FkZ2V0X2V4aXQoc3RydWN0IGR3YzMgKmR3 YykKPj4gIHsKPj4gKwlpbnQgZXBudW07Cj4+ICsJdW5zaWduZWQgbG9uZyBmbGFnczsKPj4gKwo+ PiArCXNwaW5fbG9ja19pcnFzYXZlKCZkd2MtPmxvY2ssIGZsYWdzKTsKPj4gKwlmb3IgKGVwbnVt ID0gMjsgZXBudW0gPCBEV0MzX0VORFBPSU5UU19OVU07IGVwbnVtKyspIHsKPj4gKwkJc3RydWN0 IGR3YzNfZXAgICpkZXAgPSBkd2MtPmVwc1tlcG51bV07Cj4+ICsKPj4gKwkJaWYgKCFkZXApCj4+ ICsJCQljb250aW51ZTsKPj4gKwo+PiArCQlkZXAtPmZsYWdzICY9IH5EV0MzX0VQX0VORF9UUkFO U0ZFUl9QRU5ESU5HOwo+PiArCX0KPj4gKwlzcGluX3VubG9ja19pcnFyZXN0b3JlKCZkd2MtPmxv Y2ssIGZsYWdzKTsKPj4gKwo+PiAgCXVzYl9kZWxfZ2FkZ2V0X3VkYygmZHdjLT5nYWRnZXQpOwo+ PiAgCWR3YzNfZ2FkZ2V0X2ZyZWVfZW5kcG9pbnRzKGR3Yyk7Cj4gCj4gZnJlZSBlbmRwb2ludHMg aXMgYSBiZXR0ZXIgcGxhY2UgZm9yIHRoaXMuIEl0J3MgYWxyZWFkeSBnb2luZyB0byBmcmVlCj4g dGhlIG1lbW9yeSBhbnl3YXkuIE1pZ2h0IGFzIHdlbGwgY2xlYXIgYWxsIGZsYWdzIHRvIDAgdGhl cmUuCj4gCgpCdXQgaXQgd29uJ3Qgc29sdmUgdGhlIGRlYWRsb2NrIGlzc3VlLiBTaW5jZSBkd2Mz X2dhZGdldF9mcmVlX2VuZHBvaW50cygpCmlzIGNhbGxlZCBhZnRlciB1c2JfZGVsX2dhZGdldF91 ZGMoKSBhbmQgdGhlIGRlYWRsb2NrIGhhcHBlbnMgd2hlbgoKdXNiX2RlbF9nYWRnZXRfdWRjKCkt PnVkY19zdG9wKCktPmR3YzNfZ2FkZ2V0X3N0b3AoKS0+d2FpdF9ldmVudF9sb2NrX2lycSgpCgph bmQgRFdDM19FUF9FTkRfVFJBTlNGRVJfUEVORElORyBmbGFnIGlzIHNldC4K