/* * Navman Serial USB driver * * Copyright (C) 2006 Greg Kroah-Hartman * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * TODO: * Add termios method that uses copy_hw but also kills all echo * flags as the navman is rx only so cannot echo. */ #include #include #include #include #include #include #include static const struct usb_device_id id_table[] = { { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ { }, }; MODULE_DEVICE_TABLE(usb, id_table); static void navman_read_int_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; unsigned char *data = urb->transfer_buffer; int status = urb->status; int result; switch (status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", __func__, status); return; default: dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", __func__, status); goto exit; } usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); if (urb->actual_length) { tty_insert_flip_string(&port->port, data, urb->actual_length); tty_flip_buffer_push(&port->port); } exit: result = usb_submit_urb(urb, GFP_ATOMIC); if (result) dev_err(&urb->dev->dev, "%s - Error %d submitting interrupt urb\n", __func__, result); } static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) { int result = 0; if (port->interrupt_in_urb) { dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", __func__); result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (result) dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __func__, result); } return result; } static void navman_close(struct usb_serial_port *port) { usb_kill_urb(port->interrupt_in_urb); } static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { /* * This device can't write any data, only read from the device */ return -EOPNOTSUPP; } static struct usb_serial_driver navman_device = { .driver = { .owner = THIS_MODULE, .name = "navman", }, .id_table = id_table, .num_ports = 1, .open = navman_open, .close = navman_close, .write = navman_write, .read_int_callback = navman_read_int_callback, }; static struct usb_serial_driver * const serial_drivers[] = { &navman_device, NULL }; module_usb_serial_driver(serial_drivers, id_table); MODULE_LICENSE("GPL"); 4f9cb22c77d99ea510bd5c382a'>root/drivers
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authorBert Kenward <bkenward@solarflare.com>2017-02-06 16:50:55 +0000
committerDavid S. Miller <davem@davemloft.net>2017-02-06 11:59:36 -0500
commitf820c0ac6cc84d4f9cb22c77d99ea510bd5c382a (patch)
treecc445d4d83b850d5a8860ca2a36bb5138d1f86a0 /drivers
parentd15c9ede6123dbce14c17eb9ced229e488002735 (diff)
sfc: don't rearm interrupts if busy polling
Since commit 364b6055738b ("net: busy-poll: return busypolling status to drivers"), napi_complete_done() returns a boolean that can be used by drivers to conditionally rearm interrupts. Testing with a 7142 shows a small latency improvement of ~100 ns. Signed-off-by: Bert Kenward <bkenward@solarflare.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/sfc/efx.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c