linux-kernel - [PATCH 4.4 021/132] USB: serial: cp210x: enable usb generic throttle/unthrottle

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Message-Id: <20201228124847.436946473@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:48:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Brant Merryman <brant.merryman@...abs.com>,
        Phu Luu <phu.luu@...abs.com>, Johan Hovold <johan@...nel.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.4 021/132] USB: serial: cp210x: enable usb generic throttle/unthrottle

From: Brant Merryman <brant.merryman@...abs.com>

commit 4387b3dbb079d482d3c2b43a703ceed4dd27ed28 upstream

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: Brant Merryman <brant.merryman@...abs.com>
Co-developed-by: Phu Luu <phu.luu@...abs.com>
Signed-off-by: Phu Luu <phu.luu@...abs.com>
Link: https://lore.kernel.org/r/57401AF3-9961-461F-95E1-F8AFC2105F5E@silabs.com
[ johan: fix up tags ]
Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control")
Cc: stable <stable@...r.kernel.org>     # 2.6.12
Signed-off-by: Johan Hovold <johan@...nel.org>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/serial/cp210x.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -252,6 +252,8 @@ static struct usb_serial_driver cp210x_d
 	.close			= cp210x_close,
 	.break_ctl		= cp210x_break_ctl,
 	.set_termios		= cp210x_set_termios,
+	.throttle		= usb_serial_generic_throttle,
+	.unthrottle		= usb_serial_generic_unthrottle,
 	.tiocmget		= cp210x_tiocmget,
 	.tiocmset		= cp210x_tiocmset,
 	.attach			= cp210x_startup,