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: [V8,1/4] USB: serial: f81232: clear overrun flag From: Johan Hovold Message-Id: <20190426062312.GB12280@localhost> Date: Fri, 26 Apr 2019 08:23:12 +0200 To: "Ji-Ze Hong \(Peter Hong\)" Cc: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Ji-Ze Hong \(Peter Hong\)" , Oliver Neukum List-ID: T24gRnJpLCBBcHIgMTksIDIwMTkgYXQgMTA6NDU6MzBBTSArMDgwMCwgSmktWmUgSG9uZyAoUGV0 ZXIgSG9uZykgd3JvdGU6Cj4gVGhlIEY4MTIzMiB3aWxsIHJlcG9ydCBkYXRhIGFuZCBMU1Igd2l0 aCBidWxrIGxpa2UgZm9sbG93aW5nIGZvcm1hdDoKPiBidWxrLWluIGRhdGE6IFtMU1IoMUJ5dGUp K0RBVEEoMUJ5dGUpXVtMU1IoMUJ5dGUpK0RBVEEoMUJ5dGUpXS4uLgo+IAo+IExTUiB3aWxsIGF1 dG8gY2xlYXIgZnJhbWUvcGFyaXR5L2JyZWFrIGVycm9yIGZsYWcgd2hlbiByZWFkaW5nIGJ5IEgv VywKPiBidXQgb3ZlcnJydW4gd2lsbCBvbmx5IGNsZWFyZWQgd2hlbiByZWFkaW5nIExTUi4gU28g dGhpcyBwYXRjaCBhZGQgYQo+IHdvcmtlciB0byByZWFkIExTUiB3aGVuIG92ZXJydW4gYW5kIGZs dXNoIHRoZSB3b3JrZXIgb24gY2xvc2UoKSAmCj4gc3VzcGVuZCgpLgo+IAo+IENjOiBPbGl2ZXIg TmV1a3VtIDxvbmV1a3VtQHN1c2UuY29tPgo+IFNpZ25lZC1vZmYtYnk6IEppLVplIEhvbmcgKFBl dGVyIEhvbmcpIDxocGV0ZXIrbGludXhfa2VybmVsQGdtYWlsLmNvbT4KPiAtLS0KPiB2ODoKPiAJ MTogRml4IHVzYl9zdWJtaXRfdXJiKCkgaW4gZjgxMjMyX3Jlc3VtZSgpIHdpdGggR0ZQX05PSU8s IG5vdAo+IAkgICBHRlBfS0VSTkVMLgo+IAo+IHY3Ogo+IAkxOiBSZW1vdmUgc2VyaWFsLT5zdXNw ZW5kaW5nIGNoZWNrCj4gCTI6IEFkZCBwb3J0IHByaXYgaXNfcG9ydF9vcGVuIHRvIHNhdmUgcG9y dCBvcGVuIHN0YXRlLiBXZSdsbAo+IAkgICByZWdpc3RlciBpbnRlcnJ1cHQtaW4gdXJiIGluIGY4 MTIzMl9yZXN1bWUoKSB3aGVuIHBvcnQgaXMKPiAJICAgb3BlbmVkLgo+IAkzOiBVc2luZyB1c2Jf a2lsbF91cmIgZm9yIHJlYWQvaW50ZXJydXB0IHVyYiB0byBlbnN1cmUgdXJiCj4gCSAgIHN0b3Bw ZWQuCgo+ICBkcml2ZXJzL3VzYi9zZXJpYWwvZjgxMjMyLmMgfCA5NyArKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKy0tLS0KPiAgMSBmaWxlIGNoYW5nZWQsIDg5IGluc2Vy dGlvbnMoKyksIDggZGVsZXRpb25zKC0pCj4gCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvdXNiL3Nl cmlhbC9mODEyMzIuYyBiL2RyaXZlcnMvdXNiL3NlcmlhbC9mODEyMzIuYwo+IGluZGV4IDBkY2Rj YjRiMmNkZS4uMWYwZGQ0MDg3ZDc5IDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMvdXNiL3NlcmlhbC9m ODEyMzIuYwo+ICsrKyBiL2RyaXZlcnMvdXNiL3NlcmlhbC9mODEyMzIuYwo+IEBAIC00MSwxMiAr NDEsMTUgQEAgTU9EVUxFX0RFVklDRV9UQUJMRSh1c2IsIGlkX3RhYmxlKTsKPiAgI2RlZmluZSBG SUZPX0NPTlRST0xfUkVHSVNURVIJCSgweDAyICsgU0VSSUFMX0JBU0VfQUREUkVTUykKPiAgI2Rl ZmluZSBMSU5FX0NPTlRST0xfUkVHSVNURVIJCSgweDAzICsgU0VSSUFMX0JBU0VfQUREUkVTUykK PiAgI2RlZmluZSBNT0RFTV9DT05UUk9MX1JFR0lTVEVSCQkoMHgwNCArIFNFUklBTF9CQVNFX0FE RFJFU1MpCj4gKyNkZWZpbmUgTElORV9TVEFUVVNfUkVHSVNURVIJCSgweDA1ICsgU0VSSUFMX0JB U0VfQUREUkVTUykKPiAgI2RlZmluZSBNT0RFTV9TVEFUVVNfUkVHSVNURVIJCSgweDA2ICsgU0VS SUFMX0JBU0VfQUREUkVTUykKPiAgCj4gIHN0cnVjdCBmODEyMzJfcHJpdmF0ZSB7Cj4gIAlzdHJ1 Y3QgbXV0ZXggbG9jazsKPiAgCXU4IG1vZGVtX2NvbnRyb2w7Cj4gIAl1OCBtb2RlbV9zdGF0dXM7 Cj4gKwlib29sIGlzX3BvcnRfb3BlbjsKClRoaXMgcGF0Y2ggY2FuIGJlIHNpbXBsaWZpZWQgYnkg dXNpbmcgdGhlIHR0eV9wb3J0X2luaXRpYWxpemVkKCkgbWFjcm8KaW4gcmVzdW1lIGluc3RlYWQg b2YgYWRkaW5nIGEgbmV3IG9wZW4gZmxhZy4gVGhpcyBpcyB0aGUgY29tbW9uIHdheSBVU0IKc2Vy aWFsIGRyaXZlcnMgZGVhbCB3aXRoIHRoaXMgYW5kIHdpbGwgYWxsb3cgYSBsb3QgdGhlIG5ldyBs b2NraW5nIHRvIGdvCmF3YXkuCgo+ICtzdGF0aWMgaW50IGY4MTIzMl9yZXN1bWUoc3RydWN0IHVz Yl9zZXJpYWwgKnNlcmlhbCkKPiArewo+ICsJc3RydWN0IHVzYl9zZXJpYWxfcG9ydCAqcG9ydCA9 IHNlcmlhbC0+cG9ydFswXTsKPiArCXN0cnVjdCBmODEyMzJfcHJpdmF0ZSAqcG9ydF9wcml2ID0g dXNiX2dldF9zZXJpYWxfcG9ydF9kYXRhKHBvcnQpOwo+ICsJaW50IHJlc3VsdCA9IDA7Cj4gKwo+ ICsJbXV0ZXhfbG9jaygmcG9ydF9wcml2LT5sb2NrKTsKPiArCj4gKwlpZiAocG9ydF9wcml2ICYm IHBvcnRfcHJpdi0+aXNfcG9ydF9vcGVuKSB7Cj4gKwkJcmVzdWx0ID0gdXNiX3N1Ym1pdF91cmIo cG9ydC0+aW50ZXJydXB0X2luX3VyYiwgR0ZQX05PSU8pOwo+ICsJCWlmIChyZXN1bHQpIHsKPiAr CQkJZGV2X2VycigmcG9ydC0+ZGV2LAo+ICsJCQkJCSIlczogc3VibWl0IGludGVycnVwdCB1cmIg ZmFpbGVkOiAlZCIsCj4gKwkJCQkJX19mdW5jX18sIHJlc3VsdCk7CgpNaXNzaW5nICdcbicsIGFs c28gcGxlYXNlIGRyb3AgdGhlIGZ1bmN0aW9uIHByZWZpeC4KCkpvaGFuCg== From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_MUTT 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 84B76C43219 for ; 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[85.230.190.116]) by smtp.gmail.com with ESMTPSA id p76sm6085456ljb.63.2019.04.25.23.23.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 23:23:13 -0700 (PDT) Received: from johan by xi.terra with local (Exim 4.91) (envelope-from ) id 1hJuGO-0003kw-IX; Fri, 26 Apr 2019 08:23:12 +0200 Date: Fri, 26 Apr 2019 08:23:12 +0200 From: Johan Hovold To: "Ji-Ze Hong (Peter Hong)" Cc: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" , Oliver Neukum Subject: Re: [PATCH V8 1/4] USB: serial: f81232: clear overrun flag Message-ID: <20190426062312.GB12280@localhost> References: <1555641933-19336-1-git-send-email-hpeter+linux_kernel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline In-Reply-To: <1555641933-19336-1-git-send-email-hpeter+linux_kernel@gmail.com> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Message-ID: <20190426062312.HG8mNehyFRe7H0IoGIaPWmUU4uOFUvCIr4NEu2VXZiM@z> On Fri, Apr 19, 2019 at 10:45:30AM +0800, Ji-Ze Hong (Peter Hong) wrote: > The F81232 will report data and LSR with bulk like following format: > bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... > > LSR will auto clear frame/parity/break error flag when reading by H/W, > but overrrun will only cleared when reading LSR. So this patch add a > worker to read LSR when overrun and flush the worker on close() & > suspend(). > > Cc: Oliver Neukum > Signed-off-by: Ji-Ze Hong (Peter Hong) > --- > v8: > 1: Fix usb_submit_urb() in f81232_resume() with GFP_NOIO, not > GFP_KERNEL. > > v7: > 1: Remove serial->suspending check > 2: Add port priv is_port_open to save port open state. We'll > register interrupt-in urb in f81232_resume() when port is > opened. > 3: Using usb_kill_urb for read/interrupt urb to ensure urb > stopped. > drivers/usb/serial/f81232.c | 97 +++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 89 insertions(+), 8 deletions(-) > > diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c > index 0dcdcb4b2cde..1f0dd4087d79 100644 > --- a/drivers/usb/serial/f81232.c > +++ b/drivers/usb/serial/f81232.c > @@ -41,12 +41,15 @@ MODULE_DEVICE_TABLE(usb, id_table); > #define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS) > #define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS) > #define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS) > +#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS) > #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS) > > struct f81232_private { > struct mutex lock; > u8 modem_control; > u8 modem_status; > + bool is_port_open; This patch can be simplified by using the tty_port_initialized() macro in resume instead of adding a new open flag. This is the common way USB serial drivers deal with this and will allow a lot the new locking to go away. > +static int f81232_resume(struct usb_serial *serial) > +{ > + struct usb_serial_port *port = serial->port[0]; > + struct f81232_private *port_priv = usb_get_serial_port_data(port); > + int result = 0; > + > + mutex_lock(&port_priv->lock); > + > + if (port_priv && port_priv->is_port_open) { > + result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); > + if (result) { > + dev_err(&port->dev, > + "%s: submit interrupt urb failed: %d", > + __func__, result); Missing '\n', also please drop the function prefix. Johan