From 54f328d0c7221675e3c1647e1918172fec1b92c9 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 24 Dec 2009 12:42:08 +0100 Subject: [PATCH] USB: ftdi_sio: fix latency-timeout endianess bug Also fixes DMA transfer to stack for latency buffer. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ftdi_sio.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index ec901ed5d93c..59b6cbf020a0 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1181,22 +1181,28 @@ static int read_latency_timer(struct usb_serial_port *port) { struct ftdi_private *priv = usb_get_serial_port_data(port); struct usb_device *udev = port->serial->dev; - unsigned short latency = 0; + unsigned char *buf; int rv = 0; dbg("%s", __func__); + buf = kmalloc(1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + rv = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), FTDI_SIO_GET_LATENCY_TIMER_REQUEST, FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE, 0, priv->interface, - (char *) &latency, 1, WDR_TIMEOUT); - + buf, 1, WDR_TIMEOUT); if (rv < 0) dev_err(&port->dev, "Unable to read latency timer: %i\n", rv); else - priv->latency = latency; + priv->latency = buf[0]; + + kfree(buf); + return rv; } -- 2.39.2