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USB: ftdi_sio: set device latency timeout at port probe

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No need to set latency timeout at every open.

This also fixes an issue with the read latency being as high as 250ms
(instead of 1ms) for the first read after port probe.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold 2010-10-11 20:23:36 +02:00 committed by Greg Kroah-Hartman
parent 3ed780117d
commit c19db4c9e4
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/serial/ftdi_sio.c
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@ -1589,6 +1589,7 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
ftdi_set_max_packet_size(port);
if (read_latency_timer(port) < 0)
priv->latency = 16;
write_latency_timer(port);
create_sysfs_attrs(port);
return 0;
}
@ -1717,8 +1718,6 @@ static int ftdi_open(struct tty_struct *tty, struct usb_serial_port *port)
dbg("%s", __func__);
write_latency_timer(port);
/* No error checking for this (will get errors later anyway) */
/* See ftdi_sio.h for description of what is reset */
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),