Commit bf66f373 authored by Christian Pellegrin's avatar Christian Pellegrin Committed by David S. Miller

can: mcp251x: Move to threaded interrupts instead of workqueues.

This patch addresses concerns about efficiency of handling incoming
packets. Handling of interrupts is done in a threaded interrupt handler
which has a smaller latency than workqueues. This change needed a rework
of the locking scheme that was much simplified. Some other (more or less
longstanding) bugs are fixed: utilization of just half of the RX
buffers, useless wait for interrupt on open, more reliable reset
sequence. The MERR interrupt is not used anymore: it overloads the CPU
in error-passive state without any additional information. One shot mode
is disabled because it's not clear if it can be handled efficiently on
this CAN controller.
Signed-off-by: default avatarChristian Pellegrin <chripell@fsfe.org>
Acked-by: default avatarWolfgang Grandegger <wg@grandegger.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 35cfabdc
......@@ -180,6 +180,14 @@
#define RXBEID0_OFF 4
#define RXBDLC_OFF 5
#define RXBDAT_OFF 6
#define RXFSIDH(n) ((n) * 4)
#define RXFSIDL(n) ((n) * 4 + 1)
#define RXFEID8(n) ((n) * 4 + 2)
#define RXFEID0(n) ((n) * 4 + 3)
#define RXMSIDH(n) ((n) * 4 + 0x20)
#define RXMSIDL(n) ((n) * 4 + 0x21)
#define RXMEID8(n) ((n) * 4 + 0x22)
#define RXMEID0(n) ((n) * 4 + 0x23)
#define GET_BYTE(val, byte) \
(((val) >> ((byte) * 8)) & 0xff)
......@@ -219,7 +227,8 @@ struct mcp251x_priv {
struct net_device *net;
struct spi_device *spi;
struct mutex spi_lock; /* SPI buffer lock */
struct mutex mcp_lock; /* SPI device lock */
u8 *spi_tx_buf;
u8 *spi_rx_buf;
dma_addr_t spi_tx_dma;
......@@ -227,11 +236,11 @@ struct mcp251x_priv {
struct sk_buff *tx_skb;
int tx_len;
struct workqueue_struct *wq;
struct work_struct tx_work;
struct work_struct irq_work;
struct completion awake;
int wake;
struct work_struct restart_work;
int force_quit;
int after_suspend;
#define AFTER_SUSPEND_UP 1
......@@ -245,6 +254,7 @@ static void mcp251x_clean(struct net_device *net)
{
struct mcp251x_priv *priv = netdev_priv(net);
if (priv->tx_skb || priv->tx_len)
net->stats.tx_errors++;
if (priv->tx_skb)
dev_kfree_skb(priv->tx_skb);
......@@ -300,16 +310,12 @@ static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
u8 val = 0;
mutex_lock(&priv->spi_lock);
priv->spi_tx_buf[0] = INSTRUCTION_READ;
priv->spi_tx_buf[1] = reg;
mcp251x_spi_trans(spi, 3);
val = priv->spi_rx_buf[2];
mutex_unlock(&priv->spi_lock);
return val;
}
......@@ -317,15 +323,11 @@ static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
{
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
mutex_lock(&priv->spi_lock);
priv->spi_tx_buf[0] = INSTRUCTION_WRITE;
priv->spi_tx_buf[1] = reg;
priv->spi_tx_buf[2] = val;
mcp251x_spi_trans(spi, 3);
mutex_unlock(&priv->spi_lock);
}
static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
......@@ -333,16 +335,12 @@ static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
{
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
mutex_lock(&priv->spi_lock);
priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY;
priv->spi_tx_buf[1] = reg;
priv->spi_tx_buf[2] = mask;
priv->spi_tx_buf[3] = val;
mcp251x_spi_trans(spi, 4);
mutex_unlock(&priv->spi_lock);
}
static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
......@@ -358,10 +356,8 @@ static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i,
buf[i]);
} else {
mutex_lock(&priv->spi_lock);
memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len);
mcp251x_spi_trans(spi, TXBDAT_OFF + len);
mutex_unlock(&priv->spi_lock);
}
}
......@@ -408,13 +404,9 @@ static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf,
for (; i < (RXBDAT_OFF + len); i++)
buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
} else {
mutex_lock(&priv->spi_lock);
priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN);
memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN);
mutex_unlock(&priv->spi_lock);
}
}
......@@ -467,21 +459,6 @@ static void mcp251x_hw_sleep(struct spi_device *spi)
mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP);
}
static void mcp251x_hw_wakeup(struct spi_device *spi)
{
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
priv->wake = 1;
/* Can only wake up by generating a wake-up interrupt. */
mcp251x_write_bits(spi, CANINTE, CANINTE_WAKIE, CANINTE_WAKIE);
mcp251x_write_bits(spi, CANINTF, CANINTF_WAKIF, CANINTF_WAKIF);
/* Wait until the device is awake */
if (!wait_for_completion_timeout(&priv->awake, HZ))
dev_err(&spi->dev, "MCP251x didn't wake-up\n");
}
static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
struct net_device *net)
{
......@@ -490,7 +467,6 @@ static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
if (priv->tx_skb || priv->tx_len) {
dev_warn(&spi->dev, "hard_xmit called while tx busy\n");
netif_stop_queue(net);
return NETDEV_TX_BUSY;
}
......@@ -511,12 +487,13 @@ static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
switch (mode) {
case CAN_MODE_START:
mcp251x_clean(net);
/* We have to delay work since SPI I/O may sleep */
priv->can.state = CAN_STATE_ERROR_ACTIVE;
priv->restart_tx = 1;
if (priv->can.restart_ms == 0)
priv->after_suspend = AFTER_SUSPEND_RESTART;
queue_work(priv->wq, &priv->irq_work);
queue_work(priv->wq, &priv->restart_work);
break;
default:
return -EOPNOTSUPP;
......@@ -525,7 +502,7 @@ static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
return 0;
}
static void mcp251x_set_normal_mode(struct spi_device *spi)
static int mcp251x_set_normal_mode(struct spi_device *spi)
{
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
unsigned long timeout;
......@@ -533,8 +510,7 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
/* Enable interrupts */
mcp251x_write_reg(spi, CANINTE,
CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE |
CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE |
CANINTF_MERRF);
CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE);
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
/* Put device into loopback mode */
......@@ -544,9 +520,7 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY);
} else {
/* Put device into normal mode */
mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL |
(priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT ?
CANCTRL_OSM : 0));
mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL);
/* Wait for the device to enter normal mode */
timeout = jiffies + HZ;
......@@ -555,11 +529,12 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
if (time_after(jiffies, timeout)) {
dev_err(&spi->dev, "MCP251x didn't"
" enter in normal mode\n");
return;
return -EBUSY;
}
}
}
priv->can.state = CAN_STATE_ERROR_ACTIVE;
return 0;
}
static int mcp251x_do_set_bittiming(struct net_device *net)
......@@ -590,33 +565,39 @@ static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv,
{
mcp251x_do_set_bittiming(net);
/* Enable RX0->RX1 buffer roll over and disable filters */
mcp251x_write_bits(spi, RXBCTRL(0),
RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1,
mcp251x_write_reg(spi, RXBCTRL(0),
RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1);
mcp251x_write_bits(spi, RXBCTRL(1),
RXBCTRL_RXM0 | RXBCTRL_RXM1,
mcp251x_write_reg(spi, RXBCTRL(1),
RXBCTRL_RXM0 | RXBCTRL_RXM1);
return 0;
}
static void mcp251x_hw_reset(struct spi_device *spi)
static int mcp251x_hw_reset(struct spi_device *spi)
{
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
int ret;
mutex_lock(&priv->spi_lock);
unsigned long timeout;
priv->spi_tx_buf[0] = INSTRUCTION_RESET;
ret = spi_write(spi, priv->spi_tx_buf, 1);
mutex_unlock(&priv->spi_lock);
if (ret)
if (ret) {
dev_err(&spi->dev, "reset failed: ret = %d\n", ret);
return -EIO;
}
/* Wait for reset to finish */
timeout = jiffies + HZ;
mdelay(10);
while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK)
!= CANCTRL_REQOP_CONF) {
schedule();
if (time_after(jiffies, timeout)) {
dev_err(&spi->dev, "MCP251x didn't"
" enter in conf mode after reset\n");
return -EBUSY;
}
}
return 0;
}
static int mcp251x_hw_probe(struct spi_device *spi)
......@@ -640,63 +621,17 @@ static int mcp251x_hw_probe(struct spi_device *spi)
return (st1 == 0x80 && st2 == 0x07) ? 1 : 0;
}
static irqreturn_t mcp251x_can_isr(int irq, void *dev_id)
{
struct net_device *net = (struct net_device *)dev_id;
struct mcp251x_priv *priv = netdev_priv(net);
/* Schedule bottom half */
if (!work_pending(&priv->irq_work))
queue_work(priv->wq, &priv->irq_work);
return IRQ_HANDLED;
}
static int mcp251x_open(struct net_device *net)
static void mcp251x_open_clean(struct net_device *net)
{
struct mcp251x_priv *priv = netdev_priv(net);
struct spi_device *spi = priv->spi;
struct mcp251x_platform_data *pdata = spi->dev.platform_data;
int ret;
ret = open_candev(net);
if (ret) {
dev_err(&spi->dev, "unable to set initial baudrate!\n");
return ret;
}
if (pdata->transceiver_enable)
pdata->transceiver_enable(1);
priv->force_quit = 0;
priv->tx_skb = NULL;
priv->tx_len = 0;
ret = request_irq(spi->irq, mcp251x_can_isr,
IRQF_TRIGGER_FALLING, DEVICE_NAME, net);
if (ret) {
dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
if (pdata->transceiver_enable)
pdata->transceiver_enable(0);
close_candev(net);
return ret;
}
mcp251x_hw_wakeup(spi);
mcp251x_hw_reset(spi);
ret = mcp251x_setup(net, priv, spi);
if (ret) {
free_irq(spi->irq, net);
free_irq(spi->irq, priv);
mcp251x_hw_sleep(spi);
if (pdata->transceiver_enable)
pdata->transceiver_enable(0);
close_candev(net);
return ret;
}
mcp251x_set_normal_mode(spi);
netif_wake_queue(net);
return 0;
}
static int mcp251x_stop(struct net_device *net)
......@@ -707,16 +642,18 @@ static int mcp251x_stop(struct net_device *net)
close_candev(net);
priv->force_quit = 1;
free_irq(spi->irq, priv);
destroy_workqueue(priv->wq);
priv->wq = NULL;
mutex_lock(&priv->mcp_lock);
/* Disable and clear pending interrupts */
mcp251x_write_reg(spi, CANINTE, 0x00);
mcp251x_write_reg(spi, CANINTF, 0x00);
priv->force_quit = 1;
free_irq(spi->irq, net);
flush_workqueue(priv->wq);
mcp251x_write_reg(spi, TXBCTRL(0), 0);
if (priv->tx_skb || priv->tx_len)
mcp251x_clean(net);
mcp251x_hw_sleep(spi);
......@@ -726,9 +663,27 @@ static int mcp251x_stop(struct net_device *net)
priv->can.state = CAN_STATE_STOPPED;
mutex_unlock(&priv->mcp_lock);
return 0;
}
static void mcp251x_error_skb(struct net_device *net, int can_id, int data1)
{
struct sk_buff *skb;
struct can_frame *frame;
skb = alloc_can_err_skb(net, &frame);
if (skb) {
frame->can_id = can_id;
frame->data[1] = data1;
netif_rx(skb);
} else {
dev_err(&net->dev,
"cannot allocate error skb\n");
}
}
static void mcp251x_tx_work_handler(struct work_struct *ws)
{
struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
......@@ -737,14 +692,13 @@ static void mcp251x_tx_work_handler(struct work_struct *ws)
struct net_device *net = priv->net;
struct can_frame *frame;
mutex_lock(&priv->mcp_lock);
if (priv->tx_skb) {
frame = (struct can_frame *)priv->tx_skb->data;
if (priv->can.state == CAN_STATE_BUS_OFF) {
mcp251x_clean(net);
netif_wake_queue(net);
return;
}
} else {
frame = (struct can_frame *)priv->tx_skb->data;
if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
mcp251x_hw_tx(spi, frame, 0);
......@@ -752,18 +706,18 @@ static void mcp251x_tx_work_handler(struct work_struct *ws)
can_put_echo_skb(priv->tx_skb, net, 0);
priv->tx_skb = NULL;
}
}
mutex_unlock(&priv->mcp_lock);
}
static void mcp251x_irq_work_handler(struct work_struct *ws)
static void mcp251x_restart_work_handler(struct work_struct *ws)
{
struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
irq_work);
restart_work);
struct spi_device *spi = priv->spi;
struct net_device *net = priv->net;
u8 txbnctrl;
u8 intf;
enum can_state new_state;
mutex_lock(&priv->mcp_lock);
if (priv->after_suspend) {
mdelay(10);
mcp251x_hw_reset(spi);
......@@ -772,45 +726,54 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
mcp251x_set_normal_mode(spi);
} else if (priv->after_suspend & AFTER_SUSPEND_UP) {
netif_device_attach(net);
/* Clean since we lost tx buffer */
if (priv->tx_skb || priv->tx_len) {
mcp251x_clean(net);
netif_wake_queue(net);
}
mcp251x_set_normal_mode(spi);
netif_wake_queue(net);
} else {
mcp251x_hw_sleep(spi);
}
priv->after_suspend = 0;
priv->force_quit = 0;
}
if (priv->can.restart_ms == 0 && priv->can.state == CAN_STATE_BUS_OFF)
return;
while (!priv->force_quit && !freezing(current)) {
u8 eflag = mcp251x_read_reg(spi, EFLG);
int can_id = 0, data1 = 0;
mcp251x_write_reg(spi, EFLG, 0x00);
if (priv->restart_tx) {
priv->restart_tx = 0;
mcp251x_write_reg(spi, TXBCTRL(0), 0);
if (priv->tx_skb || priv->tx_len)
mcp251x_clean(net);
netif_wake_queue(net);
can_id |= CAN_ERR_RESTARTED;
mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0);
}
mutex_unlock(&priv->mcp_lock);
}
if (priv->wake) {
/* Wait whilst the device wakes up */
mdelay(10);
priv->wake = 0;
static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
{
struct mcp251x_priv *priv = dev_id;
struct spi_device *spi = priv->spi;
struct net_device *net = priv->net;
mutex_lock(&priv->mcp_lock);
while (!priv->force_quit) {
enum can_state new_state;
u8 intf = mcp251x_read_reg(spi, CANINTF);
u8 eflag;
int can_id = 0, data1 = 0;
if (intf & CANINTF_RX0IF) {
mcp251x_hw_rx(spi, 0);
/* Free one buffer ASAP */
mcp251x_write_bits(spi, CANINTF, intf & CANINTF_RX0IF,
0x00);
}
intf = mcp251x_read_reg(spi, CANINTF);
if (intf & CANINTF_RX1IF)
mcp251x_hw_rx(spi, 1);
mcp251x_write_bits(spi, CANINTF, intf, 0x00);
eflag = mcp251x_read_reg(spi, EFLG);
mcp251x_write_reg(spi, EFLG, 0x00);
/* Update can state */
if (eflag & EFLG_TXBO) {
new_state = CAN_STATE_BUS_OFF;
......@@ -851,59 +814,31 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
}
priv->can.state = new_state;
if ((intf & CANINTF_ERRIF) || (can_id & CAN_ERR_RESTARTED)) {
struct sk_buff *skb;
struct can_frame *frame;
/* Create error frame */
skb = alloc_can_err_skb(net, &frame);
if (skb) {
/* Set error frame flags based on bus state */
frame->can_id = can_id;
frame->data[1] = data1;
/* Update net stats for overflows */
if (intf & CANINTF_ERRIF) {
/* Handle overflow counters */
if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) {
if (eflag & EFLG_RX0OVR)
net->stats.rx_over_errors++;
if (eflag & EFLG_RX1OVR)
net->stats.rx_over_errors++;
frame->can_id |= CAN_ERR_CRTL;
frame->data[1] |=
CAN_ERR_CRTL_RX_OVERFLOW;
}
netif_rx(skb);
} else {
dev_info(&spi->dev,
"cannot allocate error skb\n");
can_id |= CAN_ERR_CRTL;
data1 |= CAN_ERR_CRTL_RX_OVERFLOW;
}
mcp251x_error_skb(net, can_id, data1);
}
if (priv->can.state == CAN_STATE_BUS_OFF) {
if (priv->can.restart_ms == 0) {
priv->force_quit = 1;
can_bus_off(net);
mcp251x_hw_sleep(spi);
return;
break;
}
}
if (intf == 0)
break;
if (intf & CANINTF_WAKIF)
complete(&priv->awake);
if (intf & CANINTF_MERRF) {
/* If there are pending Tx buffers, restart queue */
txbnctrl = mcp251x_read_reg(spi, TXBCTRL(0));
if (!(txbnctrl & TXBCTRL_TXREQ)) {
if (priv->tx_skb || priv->tx_len)
mcp251x_clean(net);
netif_wake_queue(net);
}
}
if (intf & (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)) {
net->stats.tx_packets++;
net->stats.tx_bytes += priv->tx_len - 1;
......@@ -914,12 +849,66 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
netif_wake_queue(net);
}
if (intf & CANINTF_RX0IF)
mcp251x_hw_rx(spi, 0);
}
mutex_unlock(&priv->mcp_lock);
return IRQ_HANDLED;
}
if (intf & CANINTF_RX1IF)
mcp251x_hw_rx(spi, 1);
static int mcp251x_open(struct net_device *net)
{
struct mcp251x_priv *priv = netdev_priv(net);
struct spi_device *spi = priv->spi;
struct mcp251x_platform_data *pdata = spi->dev.platform_data;
int ret;
ret = open_candev(net);
if (ret) {
dev_err(&spi->dev, "unable to set initial baudrate!\n");
return ret;
}
mutex_lock(&priv->mcp_lock);
if (pdata->transceiver_enable)
pdata->transceiver_enable(1);
priv->force_quit = 0;
priv->tx_skb = NULL;
priv->tx_len = 0;
ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
IRQF_TRIGGER_FALLING, DEVICE_NAME, priv);
if (ret) {
dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
if (pdata->transceiver_enable)
pdata->transceiver_enable(0);
close_candev(net);
goto open_unlock;
}
priv->wq = create_freezeable_workqueue("mcp251x_wq");
INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler);
ret = mcp251x_hw_reset(spi);
if (ret) {
mcp251x_open_clean(net);
goto open_unlock;
}
ret = mcp251x_setup(net, priv, spi);
if (ret) {
mcp251x_open_clean(net);
goto open_unlock;
}
ret = mcp251x_set_normal_mode(spi);
if (ret) {
mcp251x_open_clean(net);
goto open_unlock;
}
netif_wake_queue(net);
open_unlock:
mutex_unlock(&priv->mcp_lock);
return ret;
}
static const struct net_device_ops mcp251x_netdev_ops = {
......@@ -955,13 +944,11 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
priv->can.clock.freq = pdata->oscillator_frequency / 2;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
if (pdata->model == CAN_MCP251X_MCP2515)
priv->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
priv->net = net;
dev_set_drvdata(&spi->dev, priv);
priv->spi = spi;
mutex_init(&priv->spi_lock);
mutex_init(&priv->mcp_lock);
/* If requested, allocate DMA buffers */
if (mcp251x_enable_dma) {
......@@ -1010,18 +997,12 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
SET_NETDEV_DEV(net, &spi->dev);
priv->wq = create_freezeable_workqueue("mcp251x_wq");
INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
INIT_WORK(&priv->irq_work, mcp251x_irq_work_handler);
init_completion(&priv->awake);
/* Configure the SPI bus */
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
spi_setup(spi);
/* Here is OK to not lock the MCP, no one knows about it yet */
if (!mcp251x_hw_probe(spi)) {
dev_info(&spi->dev, "Probe failed\n");
goto error_probe;
......@@ -1064,10 +1045,6 @@ static int __devexit mcp251x_can_remove(struct spi_device *spi)
unregister_candev(net);
free_candev(net);
priv->force_quit = 1;
flush_workqueue(priv->wq);
destroy_workqueue(priv->wq);
if (mcp251x_enable_dma) {
dma_free_coherent(&spi->dev, PAGE_SIZE,
priv->spi_tx_buf, priv->spi_tx_dma);
......@@ -1089,6 +1066,12 @@ static int mcp251x_can_suspend(struct spi_device *spi, pm_message_t state)
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
struct net_device *net = priv->net;
priv->force_quit = 1;
disable_irq(spi->irq);
/*
* Note: at this point neither IST nor workqueues are running.
* open/stop cannot be called anyway so locking is not needed
*/
if (netif_running(net)) {
netif_device_detach(net);
......@@ -1115,16 +1098,18 @@ static int mcp251x_can_resume(struct spi_device *spi)
if (priv->after_suspend & AFTER_SUSPEND_POWER) {
pdata->power_enable(1);
queue_work(priv->wq, &priv->irq_work);
queue_work(priv->wq, &priv->restart_work);
} else {
if (priv->after_suspend & AFTER_SUSPEND_UP) {
if (pdata->transceiver_enable)
pdata->transceiver_enable(1);
queue_work(priv->wq, &priv->irq_work);
queue_work(priv->wq, &priv->restart_work);
} else {
priv->after_suspend = 0;
}
}
priv->force_quit = 0;
enable_irq(spi->irq);
return 0;
}
#else
......
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