linux-kernel - [PATCH v3 1/2] USB: serial: cp210x: Enable usb generic throttle/unthrottle

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Message-ID: <DM6PR11MB28578CA6D09D13A07D7959D99C950@DM6PR11MB2857.namprd11.prod.outlook.com>
Date:   Wed, 24 Jun 2020 07:01:33 +0000
From:   Phu Luu <Phu.Luu@...abs.com>
To:     "johan@...nel.org" <johan@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Brant Merryman <Brant.Merryman@...abs.com>,
        Richard Hendricks <Richard.Hendricks@...abs.com>
Subject: [PATCH v3 1/2] USB: serial: cp210x: Enable usb generic
 throttle/unthrottle

Assign the .throttle and .unthrottle functions to be generic function
in the driver structure to prevent data loss that can otherwise occur
if the host does not enable USB throttling.

Signed-off-by: Phu Luu <phu.luu@...abs.com>
Signed-off-by: Brant Merryman <brant.merryman@...abs.com>
---
06/09/2020: Patch v3 1/2 Modified based on feedback from Johan Hovold <johan@...nel.org>
12/18/2019: Patch v2 Broken into two patches and modified based on feedback from Johan Hovold <johan@...nel.org>
12/09/2019: Initial submission of patch "Proper RTS control when buffers fill"

 drivers/usb/serial/cp210x.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index f5143eedbc48..bcceb4ad8be0 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -272,6 +272,8 @@ static struct usb_serial_driver cp210x_device = {
 	.break_ctl		= cp210x_break_ctl,
 	.set_termios		= cp210x_set_termios,
 	.tx_empty		= cp210x_tx_empty,
+	.throttle		= usb_serial_generic_throttle,
+	.unthrottle		= usb_serial_generic_unthrottle,
 	.tiocmget		= cp210x_tiocmget,
 	.tiocmset		= cp210x_tiocmset,
 	.attach			= cp210x_attach,
-- 
2.17.0