/* ELM327 based CAN interface driver (tty line discipline)
*
* This driver started as a derivative of linux/drivers/net/can/slcan.c
- * and my thanks go to the original authors for their inspiration, even
- * after almost none of their code is left.
+ * and my thanks go to the original authors for their inspiration.
*
* elmcan.c Author : Max Staudt <max-linux@enpas.org>
* slcan.c Author : Oliver Hartkopp <socketcan@hartkopp.net>
#include <linux/can/rx-offload.h>
/* Line discipline ID number.
- * N_DEVELOPMENT will likely be defined from Linux 5.18 onwards:
- * https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-next&id=c2faf737abfb10f88f2d2612d573e9edc3c42c37
+ * Starting with Linux v5.18-rc1, N_DEVELOPMENT is defined as 29:
+ * https://github.com/torvalds/linux/commit/c2faf737abfb10f88f2d2612d573e9edc3c42c37
*/
#ifndef N_DEVELOPMENT
#define N_DEVELOPMENT 29
{
int written;
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
if (elm->uart_side_failure)
return;
elm->txleft = len - written;
elm->txhead = elm->txbuf + written;
- if (!elm->txleft)
- netif_wake_queue(elm->dev);
- else
+ if (elm->txleft)
set_bit(TTY_DO_WRITE_WAKEUP, &elm->tty->flags);
}
*/
static void elm327_kick_into_cmd_mode(struct elmcan *elm)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
if (elm->state != ELM327_STATE_GETDUMMYCHAR &&
elm->state != ELM327_STATE_GETPROMPT) {
/* Schedule a CAN frame and necessary config changes to be sent to the TTY. */
static void elm327_send_frame(struct elmcan *elm, struct can_frame *frame)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
/* Schedule any necessary changes in ELM327's CAN configuration */
if (elm->can_frame_to_send.can_id != frame->can_id) {
static void elm327_init(struct elmcan *elm)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
elm->state = ELM327_STATE_NOTINIT;
elm->can_frame_to_send.can_id = 0x7df; /* ELM327 HW default */
static void elm327_feed_frame_to_netdev(struct elmcan *elm,
struct sk_buff *skb)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
if (!netif_running(elm->dev))
return;
struct can_frame *frame;
struct sk_buff *skb;
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
elm->uart_side_failure = true;
struct can_frame *frame;
struct sk_buff *skb;
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
skb = alloc_can_err_skb(elm->dev, &frame);
if (!skb)
int datastart;
int i;
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
skb = alloc_can_skb(elm->dev, &frame);
if (!skb)
static void elm327_parse_line(struct elmcan *elm, size_t len)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
/* Skip empty lines */
if (!len)
*/
char local_txbuf[sizeof("0102030405060708\r")];
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
if (!elm->cmds_todo) {
/* Enter CAN monitor mode */
elm327_send(elm, "ATMA\r", 5);
elm->state = ELM327_STATE_RECEIVING;
+ /* We will be in the default state once this command is
+ * send, so enable the TX packet queue.
+ */
+ netif_wake_queue(elm->dev);
+
return;
}
elm->drop_next_line = 1;
elm->state = ELM327_STATE_RECEIVING;
+
+ /* We will be in the default state once this command is
+ * send, so enable the TX packet queue.
+ */
+ netif_wake_queue(elm->dev);
}
elm327_send(elm, local_txbuf, strlen(local_txbuf));
static void elm327_drop_bytes(struct elmcan *elm, size_t i)
{
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
memmove(&elm->rxbuf[0], &elm->rxbuf[i], ELM327_SIZE_RXBUF - i);
elm->rxfill -= i;
size_t len;
int i;
- lockdep_assert_held(elm->lock);
+ lockdep_assert_held(&elm->lock);
switch (elm->state) {
case ELM327_STATE_NOTINIT:
elm327_send(elm, ELM327_DUMMY_STRING, 1);
spin_unlock_bh(&elm->lock);
- /* Give UART one final chance to flush.
- * This may netif_wake_queue(), so don't netif_stop_queue()
- * before flushing the worker.
- */
+ netif_stop_queue(dev);
+
+ /* Give UART one final chance to flush. */
clear_bit(TTY_DO_WRITE_WAKEUP, &elm->tty->flags);
flush_work(&elm->tx_work);
- netif_stop_queue(dev);
-
can_rx_offload_disable(&elm->offload);
elm->can.state = CAN_STATE_STOPPED;
can_rx_offload_del(&elm->offload);
if (!elm->txleft) {
clear_bit(TTY_DO_WRITE_WAKEUP, &elm->tty->flags);
spin_unlock_bh(&elm->lock);
- netif_wake_queue(elm->dev);
} else {
spin_unlock_bh(&elm->lock);
}