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spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=0 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=ti.com header.result=pass header_is_org_domain=yes Authentication-Results: mx4.messagingengine.com; arc=none (no signatures found); dkim=fail (body has been altered; 1024-bit rsa key sha256) header.d=ti.com header.i=@ti.com header.b=AxyuKTy4 x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=ti-com-17Q1; dmarc=fail (p=quarantine,has-list-id=yes,d=quarantine) header.from=ti.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=0 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=ti.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753368AbeCPKeP (ORCPT ); Fri, 16 Mar 2018 06:34:15 -0400 Received: from lelnx194.ext.ti.com ([198.47.27.80]:29732 "EHLO lelnx194.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753352AbeCPKeO (ORCPT ); Fri, 16 Mar 2018 06:34:14 -0400 Subject: Re: [PATCH v2] usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume To: CC: , References: <1519730526-22274-1-git-send-email-rogerq@ti.com> From: Roger Quadros Message-ID: <69517684-bd39-e945-0c9e-ccd52b8050d5@ti.com> Date: Fri, 16 Mar 2018 12:34:10 +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: 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: Hi Felipe, On 09/03/18 14:47, Roger Quadros wrote: > 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() > > To fix this instead of waiting indefinitely with wait_event_lock_irq() > we use wait_event_interruptible_lock_irq_timeout() and print > and error message if there was a timeout. > > Signed-off-by: Roger Quadros Thanks for picking this for -next. Is it better to have this in v4.16-rc fixes? and also stable? v4.12+ > --- > > Changelog: > > v2: > - use wait_event_interruptible_lock_irq_timeout() instead of wait_event_lock_irq() > > drivers/usb/dwc3/gadget.c | 23 ++++++++++++++++++++--- > 1 file changed, 20 insertions(+), 3 deletions(-) > > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c > index 2bda4eb..7c3a6e4 100644 > --- a/drivers/usb/dwc3/gadget.c > +++ b/drivers/usb/dwc3/gadget.c > @@ -1950,6 +1950,7 @@ static int dwc3_gadget_stop(struct usb_gadget *g) > struct dwc3 *dwc = gadget_to_dwc(g); > unsigned long flags; > int epnum; > + u32 tmo_eps = 0; > > spin_lock_irqsave(&dwc->lock, flags); > > @@ -1960,6 +1961,7 @@ static int dwc3_gadget_stop(struct usb_gadget *g) > > for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) { > struct dwc3_ep *dep = dwc->eps[epnum]; > + int ret; > > if (!dep) > continue; > @@ -1967,9 +1969,24 @@ static int dwc3_gadget_stop(struct usb_gadget *g) > if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING)) > continue; > > - wait_event_lock_irq(dep->wait_end_transfer, > - !(dep->flags & DWC3_EP_END_TRANSFER_PENDING), > - dwc->lock); > + ret = wait_event_interruptible_lock_irq_timeout(dep->wait_end_transfer, > + !(dep->flags & DWC3_EP_END_TRANSFER_PENDING), > + dwc->lock, msecs_to_jiffies(5)); > + > + if (ret <= 0) { > + /* Timed out or interrupted! There's nothing much > + * we can do so we just log here and print which > + * endpoints timed out at the end. > + */ > + tmo_eps |= 1 << epnum; > + dep->flags &= DWC3_EP_END_TRANSFER_PENDING; > + } > + } > + > + if (tmo_eps) { > + dev_err(dwc->dev, > + "end transfer timed out on endpoints 0x%x [bitmap]\n", > + tmo_eps); > } > > out: > -- 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: [v2] usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume From: Roger Quadros Message-Id: <69517684-bd39-e945-0c9e-ccd52b8050d5@ti.com> Date: Fri, 16 Mar 2018 12:34:10 +0200 To: balbi@kernel.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org List-ID: SGkgRmVsaXBlLAoKT24gMDkvMDMvMTggMTQ6NDcsIFJvZ2VyIFF1YWRyb3Mgd3JvdGU6Cj4gSW4g dGhlIGZvbGxvd2luZyB0ZXN0IHdlIGdldCBzdHVjayBieSBzbGVlcGluZyBmb3JldmVyIGluIF9k d2MzX3NldF9tb2RlKCkKPiBhZnRlciB3aGljaCBkdWFsLXJvbGUgc3dpdGNoaW5nIGRvZXNuJ3Qg d29yay4KPiAKPiBPbiBkcmE3LWV2bSdzIGR1YWwtcm9sZSBwb3J0LAo+IC0gTG9hZCBnX3plcm8g Z2FkZ2V0IGRyaXZlciBhbmQgZW51bWVyYXRlIHRvIGhvc3QKPiAtIHN1c3BlbmQgdG8gbWVtCj4g LSBkaXNjb25uZWN0IFVTQiBjYWJsZSB0byBob3N0IGFuZCBjb25uZWN0IG90ZyBjYWJsZSB3aXRo IFBlbiBkcml2ZSBpbiBpdC4KPiAtIHJlc3VtZSBzeXN0ZW0KPiAtIHdlIHNsZWVwIGluZGVmaW5p dGVseSBpbiBfZHdjM19zZXRfbW9kZSBkdWUgdG8uCj4gICBkd2MzX2dhZGdldF9leGl0KCktPnVz Yl9kZWxfZ2FkZ2V0X3VkYygpLT51ZGNfc3RvcCgpLT4KPiAJZHdjM19nYWRnZXRfc3RvcCgpLT53 YWl0X2V2ZW50X2xvY2tfaXJxKCkKPiAKPiBUbyBmaXggdGhpcyBpbnN0ZWFkIG9mIHdhaXRpbmcg aW5kZWZpbml0ZWx5IHdpdGggd2FpdF9ldmVudF9sb2NrX2lycSgpCj4gd2UgdXNlIHdhaXRfZXZl bnRfaW50ZXJydXB0aWJsZV9sb2NrX2lycV90aW1lb3V0KCkgYW5kIHByaW50Cj4gYW5kIGVycm9y IG1lc3NhZ2UgaWYgdGhlcmUgd2FzIGEgdGltZW91dC4KPiAKPiBTaWduZWQtb2ZmLWJ5OiBSb2dl ciBRdWFkcm9zIDxyb2dlcnFAdGkuY29tPgoKVGhhbmtzIGZvciBwaWNraW5nIHRoaXMgZm9yIC1u ZXh0LgpJcyBpdCBiZXR0ZXIgdG8gaGF2ZSB0aGlzIGluIHY0LjE2LXJjIGZpeGVzPwphbmQgYWxz byBzdGFibGU/IHY0LjEyKwoKPiAtLS0KPiAKPiBDaGFuZ2Vsb2c6Cj4gCj4gdjI6Cj4gLSB1c2Ug d2FpdF9ldmVudF9pbnRlcnJ1cHRpYmxlX2xvY2tfaXJxX3RpbWVvdXQoKSBpbnN0ZWFkIG9mIHdh aXRfZXZlbnRfbG9ja19pcnEoKQo+IAo+ICBkcml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jIHwgMjMg KysrKysrKysrKysrKysrKysrKystLS0KPiAgMSBmaWxlIGNoYW5nZWQsIDIwIGluc2VydGlvbnMo KyksIDMgZGVsZXRpb25zKC0pCj4gCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvdXNiL2R3YzMvZ2Fk Z2V0LmMgYi9kcml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jCj4gaW5kZXggMmJkYTRlYi4uN2MzYTZl NCAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3VzYi9kd2MzL2dhZGdldC5jCj4gKysrIGIvZHJpdmVy cy91c2IvZHdjMy9nYWRnZXQuYwo+IEBAIC0xOTUwLDYgKzE5NTAsNyBAQCBzdGF0aWMgaW50IGR3 YzNfZ2FkZ2V0X3N0b3Aoc3RydWN0IHVzYl9nYWRnZXQgKmcpCj4gIAlzdHJ1Y3QgZHdjMwkJKmR3 YyA9IGdhZGdldF90b19kd2MoZyk7Cj4gIAl1bnNpZ25lZCBsb25nCQlmbGFnczsKPiAgCWludAkJ CWVwbnVtOwo+ICsJdTMyCQkJdG1vX2VwcyA9IDA7Cj4gIAo+ICAJc3Bpbl9sb2NrX2lycXNhdmUo JmR3Yy0+bG9jaywgZmxhZ3MpOwo+ICAKPiBAQCAtMTk2MCw2ICsxOTYxLDcgQEAgc3RhdGljIGlu dCBkd2MzX2dhZGdldF9zdG9wKHN0cnVjdCB1c2JfZ2FkZ2V0ICpnKQo+ICAKPiAgCWZvciAoZXBu dW0gPSAyOyBlcG51bSA8IERXQzNfRU5EUE9JTlRTX05VTTsgZXBudW0rKykgewo+ICAJCXN0cnVj dCBkd2MzX2VwICAqZGVwID0gZHdjLT5lcHNbZXBudW1dOwo+ICsJCWludCByZXQ7Cj4gIAo+ICAJ CWlmICghZGVwKQo+ICAJCQljb250aW51ZTsKPiBAQCAtMTk2Nyw5ICsxOTY5LDI0IEBAIHN0YXRp YyBpbnQgZHdjM19nYWRnZXRfc3RvcChzdHJ1Y3QgdXNiX2dhZGdldCAqZykKPiAgCQlpZiAoIShk ZXAtPmZsYWdzICYgRFdDM19FUF9FTkRfVFJBTlNGRVJfUEVORElORykpCj4gIAkJCWNvbnRpbnVl Owo+ICAKPiAtCQl3YWl0X2V2ZW50X2xvY2tfaXJxKGRlcC0+d2FpdF9lbmRfdHJhbnNmZXIsCj4g LQkJCQkgICAgIShkZXAtPmZsYWdzICYgRFdDM19FUF9FTkRfVFJBTlNGRVJfUEVORElORyksCj4g LQkJCQkgICAgZHdjLT5sb2NrKTsKPiArCQlyZXQgPSB3YWl0X2V2ZW50X2ludGVycnVwdGlibGVf bG9ja19pcnFfdGltZW91dChkZXAtPndhaXRfZW5kX3RyYW5zZmVyLAo+ICsJCQkgICAgIShkZXAt PmZsYWdzICYgRFdDM19FUF9FTkRfVFJBTlNGRVJfUEVORElORyksCj4gKwkJCSAgICBkd2MtPmxv Y2ssIG1zZWNzX3RvX2ppZmZpZXMoNSkpOwo+ICsKPiArCQlpZiAocmV0IDw9IDApIHsKPiArCQkJ LyogVGltZWQgb3V0IG9yIGludGVycnVwdGVkISBUaGVyZSdzIG5vdGhpbmcgbXVjaAo+ICsJCQkg KiB3ZSBjYW4gZG8gc28gd2UganVzdCBsb2cgaGVyZSBhbmQgcHJpbnQgd2hpY2gKPiArCQkJICog ZW5kcG9pbnRzIHRpbWVkIG91dCBhdCB0aGUgZW5kLgo+ICsJCQkgKi8KPiArCQkJdG1vX2VwcyB8 PSAxIDw8IGVwbnVtOwo+ICsJCQlkZXAtPmZsYWdzICY9IERXQzNfRVBfRU5EX1RSQU5TRkVSX1BF TkRJTkc7Cj4gKwkJfQo+ICsJfQo+ICsKPiArCWlmICh0bW9fZXBzKSB7Cj4gKwkJZGV2X2Vycihk d2MtPmRldiwKPiArCQkJImVuZCB0cmFuc2ZlciB0aW1lZCBvdXQgb24gZW5kcG9pbnRzIDB4JXgg W2JpdG1hcF1cbiIsCj4gKwkJCXRtb19lcHMpOwo+ICAJfQo+ICAKPiAgb3V0Ogo+Cg==