From 2a8c3dabcf6440a9ed17e8ef26bc7ed325a1ff7b Mon Sep 17 00:00:00 2001
From: "Mychaela N. Falconia" <falcon@freecalypso.org>
Date: Fri, 2 Oct 2020 17:38:56 +0000
Subject: [PATCH 2/3] USB: serial: ftdi_sio: pass port to quirk port_probe
 functions

The original code passed only the pointer to the ftdi_private struct
to quirk port_probe functions.  However, some quirks may need to be
applied conditionally only to some channels of a multichannel FT2232x
or FT4232H device, and if a given quirk's port_probe function needs
to figure out which channel of a multichannel device is currently
being considered, it needs access to the port pointer passed to the
ftdi_sio_port_probe() function, so it can traverse USB data structures
from there.

Signed-off-by: Mychaela N. Falconia <falcon@freecalypso.org>
---
 drivers/usb/serial/ftdi_sio.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 8ed84338a626..137688e9a86a 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -83,15 +83,15 @@ struct ftdi_private {
 struct ftdi_sio_quirk {
 	int (*probe)(struct usb_serial *);
 	/* Special settings for probed ports. */
-	void (*port_probe)(struct ftdi_private *);
+	void (*port_probe)(struct usb_serial_port *);
 };
 
 static int   ftdi_jtag_probe(struct usb_serial *serial);
 static int   ftdi_NDI_device_setup(struct usb_serial *serial);
 static int   ftdi_stmclite_probe(struct usb_serial *serial);
 static int   ftdi_8u2232c_probe(struct usb_serial *serial);
-static void  ftdi_USB_UIRT_setup(struct ftdi_private *priv);
-static void  ftdi_HE_TIRA1_setup(struct ftdi_private *priv);
+static void  ftdi_USB_UIRT_setup(struct usb_serial_port *port);
+static void  ftdi_HE_TIRA1_setup(struct usb_serial_port *port);
 
 static const struct ftdi_sio_quirk ftdi_jtag_quirk = {
 	.probe	= ftdi_jtag_probe,
@@ -1824,11 +1824,11 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
 
 	mutex_init(&priv->cfg_lock);
 
-	if (quirk && quirk->port_probe)
-		quirk->port_probe(priv);
-
 	usb_set_serial_port_data(port, priv);
 
+	if (quirk && quirk->port_probe)
+		quirk->port_probe(port);
+
 	ftdi_determine_type(port);
 	ftdi_set_max_packet_size(port);
 	if (read_latency_timer(port) < 0)
@@ -1841,8 +1841,10 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
 /* Setup for the USB-UIRT device, which requires hardwired
  * baudrate (38400 gets mapped to 312500) */
 /* Called from usbserial:serial_probe */
-static void ftdi_USB_UIRT_setup(struct ftdi_private *priv)
+static void ftdi_USB_UIRT_setup(struct usb_serial_port *port)
 {
+	struct ftdi_private *priv = usb_get_serial_port_data(port);
+
 	priv->flags |= ASYNC_SPD_CUST;
 	priv->custom_divisor = 77;
 	priv->force_baud = 38400;
@@ -1851,8 +1853,10 @@ static void ftdi_USB_UIRT_setup(struct ftdi_private *priv)
 /* Setup for the HE-TIRA1 device, which requires hardwired
  * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled.  */
 
-static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv)
+static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port)
 {
+	struct ftdi_private *priv = usb_get_serial_port_data(port);
+
 	priv->flags |= ASYNC_SPD_CUST;
 	priv->custom_divisor = 240;
 	priv->force_baud = 38400;
-- 
2.9.0