From patchwork Tue Jan 14 11:01:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 11331885 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F061A139A for ; Tue, 14 Jan 2020 11:02:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE7562467A for ; Tue, 14 Jan 2020 11:02:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578999732; bh=BcmwybgoI3/Jv0UFedawFhiOqDgJvdbzjxMkcQFVc18=; h=From:To:Cc:Subject:Date:List-ID:From; b=nEqzjJIheRuX7yyZgp/kN54ZYVE1v/XrFU2H6/2Zg929FqZm2Ak/8GDWEYFu/XjS0 qqceH4aAONfVJJYFCFnUsrKzE59B+aXugN8gKOoTRz+UNm4GvePtbi4goBnehz46vI Cp2Qx4v9A4ezFsb31BHEHkD+drsi+wKn+Ql8gg3w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729413AbgANLCM (ORCPT ); Tue, 14 Jan 2020 06:02:12 -0500 Received: from mail-lj1-f195.google.com ([209.85.208.195]:33881 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725842AbgANLCL (ORCPT ); Tue, 14 Jan 2020 06:02:11 -0500 Received: by mail-lj1-f195.google.com with SMTP id z22so13845570ljg.1 for ; Tue, 14 Jan 2020 03:02:10 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=oovl7D0vCEvPdIXVKgkzgDKdg6E80cIqWutVJlbSiKA=; b=lbUsJLSYxPLJGaWsp2pGVUyCg2B7fwgI3it8wq+8ud2AtcgMlLQjIwL2ET0GhpJ/uI +GCO6c8/3ivWyiAndxDYmbvfbjBxLxpd1Yz60x54tDchUvNeImRCysRMxEtP5E52ekqe zVr/RDnXLqFvWD0zSsqnv+m44yELJvw4LL0kWFErkWaNno6hitaH85ZesIEPuKaJl4Xl Zfm6+2VHHhxkCMLnGe8+sxdRF7ZVH50yE0YDPfUw20TT7uHxPelpJyDuydVM6eAYS/pp 0H884nJZJYrRp8yEYnX2AVTxiZC0YawM6Hu7QoROPbf2wvTJYdmTQ3/LQBOTmVMRcekq KSUQ== X-Gm-Message-State: APjAAAWFfe4KPtmWnr0Fwiw+e1dLZQzKKRisr7YWjH4QU5Yik05NS1TH 78aDRbJZZWifdCz0DKFqSt8= X-Google-Smtp-Source: APXvYqwLtD3TjOIF9UbwxoRdzmH/QYlB9Ero6OxwEb7ORfPjUFFI0jaA+cTZTjk4PL1WKD2c0uYJbg== X-Received: by 2002:a2e:93d5:: with SMTP id p21mr13655888ljh.50.1578999729857; Tue, 14 Jan 2020 03:02:09 -0800 (PST) Received: from xi.terra (c-14b8e655.07-184-6d6c6d4.bbcust.telenor.se. [85.230.184.20]) by smtp.gmail.com with ESMTPSA id p15sm6999323lfo.88.2020.01.14.03.02.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jan 2020 03:02:08 -0800 (PST) Received: from johan by xi.terra with local (Exim 4.92.3) (envelope-from ) id 1irJxY-0001Yw-Rv; Tue, 14 Jan 2020 12:02:08 +0100 From: Johan Hovold To: Johan Hovold Cc: linux-usb@vger.kernel.org Subject: [PATCH v2 1/2] USB: serial: opticon: add chars_in_buffer() implementation Date: Tue, 14 Jan 2020 12:01:45 +0100 Message-Id: <20200114110146.5929-1-johan@kernel.org> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add a chars_in_buffer() implementation so that the tty layer will wait for outgoing buffered data to be drained when needed (e.g. on final close()). Signed-off-by: Johan Hovold Reviewed-by: Greg Kroah-Hartman --- drivers/usb/serial/opticon.c | 45 ++++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 17 deletions(-) diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c index ed2b4e6dca38..f7bccf14a71f 100644 --- a/drivers/usb/serial/opticon.c +++ b/drivers/usb/serial/opticon.c @@ -41,6 +41,7 @@ struct opticon_private { bool rts; bool cts; int outstanding_urbs; + int outstanding_bytes; }; @@ -169,6 +170,7 @@ static void opticon_write_control_callback(struct urb *urb) spin_lock_irqsave(&priv->lock, flags); --priv->outstanding_urbs; + priv->outstanding_bytes -= urb->transfer_buffer_length; spin_unlock_irqrestore(&priv->lock, flags); usb_serial_port_softint(port); @@ -182,8 +184,8 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, struct urb *urb; unsigned char *buffer; unsigned long flags; - int status; struct usb_ctrlrequest *dr; + int ret = -ENOMEM; spin_lock_irqsave(&priv->lock, flags); if (priv->outstanding_urbs > URB_UPPER_LIMIT) { @@ -192,19 +194,16 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, return 0; } priv->outstanding_urbs++; + priv->outstanding_bytes += count; spin_unlock_irqrestore(&priv->lock, flags); buffer = kmalloc(count, GFP_ATOMIC); - if (!buffer) { - count = -ENOMEM; + if (!buffer) goto error_no_buffer; - } urb = usb_alloc_urb(0, GFP_ATOMIC); - if (!urb) { - count = -ENOMEM; + if (!urb) goto error_no_urb; - } memcpy(buffer, buf, count); @@ -213,10 +212,8 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, /* The connected devices do not have a bulk write endpoint, * to transmit data to de barcode device the control endpoint is used */ dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); - if (!dr) { - count = -ENOMEM; + if (!dr) goto error_no_dr; - } dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT; dr->bRequest = 0x01; @@ -230,12 +227,9 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, opticon_write_control_callback, port); /* send it down the pipe */ - status = usb_submit_urb(urb, GFP_ATOMIC); - if (status) { - dev_err(&port->dev, - "%s - usb_submit_urb(write endpoint) failed status = %d\n", - __func__, status); - count = status; + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret) { + dev_err(&port->dev, "failed to submit write urb: %d\n", ret); goto error; } @@ -253,8 +247,10 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, error_no_buffer: spin_lock_irqsave(&priv->lock, flags); --priv->outstanding_urbs; + priv->outstanding_bytes -= count; spin_unlock_irqrestore(&priv->lock, flags); - return count; + + return ret; } static int opticon_write_room(struct tty_struct *tty) @@ -279,6 +275,20 @@ static int opticon_write_room(struct tty_struct *tty) return 2048; } +static int opticon_chars_in_buffer(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct opticon_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + int count; + + spin_lock_irqsave(&priv->lock, flags); + count = priv->outstanding_bytes; + spin_unlock_irqrestore(&priv->lock, flags); + + return count; +} + static int opticon_tiocmget(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; @@ -383,6 +393,7 @@ static struct usb_serial_driver opticon_device = { .open = opticon_open, .write = opticon_write, .write_room = opticon_write_room, + .chars_in_buffer = opticon_chars_in_buffer, .throttle = usb_serial_generic_throttle, .unthrottle = usb_serial_generic_unthrottle, .get_serial = get_serial_info,