static void acm_softint(struct work_struct *work)
{
struct acm *acm = container_of(work, struct acm, work);
struct tty_struct *tty;
dev_vdbg(&acm->data->dev, "%s\n", __func__);
if (!ACM_READY(acm))
return;
tty = tty_port_tty_get(&acm->port);
if (!tty)
return;
tty_wakeup(tty);
tty_kref_put(tty);
}
static void acm_tty_unthrottle(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
unsigned int was_throttled;
if (!ACM_READY(acm))
return;
spin_lock_irq(&acm->read_lock);
was_throttled = acm->throttled;
acm->throttled = 0;
acm->throttle_req = 0;
spin_unlock_irq(&acm->read_lock);
if (was_throttled)
acm_submit_read_urbs(acm, GFP_KERNEL);
}
static void acm_ctrl_irq(struct urb *urb)
{
struct acm *acm = urb->context;
devrequest *dr = urb->transfer_buffer;
unsigned char *data = (unsigned char *)(dr + 1);
int newctrl;
if (!ACM_READY(acm)) return;
if (urb->status < 0) {
dbg("nonzero ctrl irq status received: %d", urb->status);
return;
}
switch (dr->request) {
case ACM_IRQ_NETWORK:
dbg("%s network", data[0] ? "connected to" : "disconnected from");
return;
case ACM_IRQ_LINE_STATE:
newctrl = le16_to_cpup((__u16 *) data);
if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dbg("calling hangup");
tty_hangup(acm->tty);
}
acm->ctrlin = newctrl;
dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
return;
default:
dbg("unknown control event received: request %d index %d len %d data0 %d data1 %d",
dr->request, dr->index, dr->length, data[0], data[1]);
return;
}
}
/* data interface wrote those outgoing bytes */
static void acm_write_bulk(struct urb *urb)
{
struct acm_wb *wb = urb->context;
struct acm *acm = wb->instance;
if (verbose || urb->status
|| (urb->actual_length != urb->transfer_buffer_length))
dev_dbg(&acm->data->dev, "tx %d/%d bytes -- > %d\n",
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
acm_write_done(acm, wb);
if (ACM_READY(acm))
schedule_work(&acm->work);
else
wake_up_interruptible(&acm->drain_wait);
}
static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct acm *acm = tty->driver_data;
unsigned int newctrl;
if (!ACM_READY(acm))
return -EINVAL;
newctrl = acm->ctrlout;
set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
newctrl = (newctrl & ~clear) | set;
if (acm->ctrlout == newctrl)
return 0;
return acm_set_control(acm, acm->ctrlout = newctrl);
}
/* data interface wrote those outgoing bytes */
static void acm_write_bulk(struct urb *urb)
{
struct acm_wb *wb = urb->context;
struct acm *acm = wb->instance;
unsigned long flags;
if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
__func__,
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
spin_lock_irqsave(&acm->write_lock, flags);
acm_write_done(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
if (ACM_READY(acm))
schedule_work(&acm->work);
}
/* data interface returns incoming bytes, or we got unthrottled */
static void acm_read_bulk(struct urb *urb)
{
struct acm_rb *buf;
struct acm_ru *rcv = urb->context;
struct acm *acm = rcv->instance;
int status = urb->status;
dbg("Entering acm_read_bulk with status %d", status);
if (!ACM_READY(acm)) {
dev_dbg(&acm->data->dev, "Aborting, acm not ready");
return;
}
usb_mark_last_busy(acm->dev);
if (status)
dev_dbg(&acm->data->dev, "bulk rx status %d\n", status);
buf = rcv->buffer;
buf->size = urb->actual_length;
if (likely(status == 0)) {
spin_lock(&acm->read_lock);
acm->processing++;
list_add_tail(&rcv->list, &acm->spare_read_urbs);
list_add_tail(&buf->list, &acm->filled_read_bufs);
spin_unlock(&acm->read_lock);
} else {
/* we drop the buffer due to an error */
spin_lock(&acm->read_lock);
list_add_tail(&rcv->list, &acm->spare_read_urbs);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock(&acm->read_lock);
/* nevertheless the tasklet must be kicked unconditionally
so the queue cannot dry up */
}
if (likely(!acm->susp_count))
tasklet_schedule(&acm->urb_task);
}
static void acm_tty_set_termios(struct tty_struct *tty,
struct ktermios *termios_old)
{
struct acm *acm = tty->driver_data;
struct ktermios *termios = tty->termios;
struct usb_cdc_line_coding newline;
int newctrl = acm->ctrlout;
if (!ACM_READY(acm))
return;
newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
newline.bParityType = termios->c_cflag & PARENB ?
(termios->c_cflag & PARODD ? 1 : 2) +
(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
/* FIXME: Needs to clear unsupported bits in the termios */
acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
if (!newline.dwDTERate) {
newline.dwDTERate = acm->line.dwDTERate;
newctrl &= ~ACM_CTRL_DTR;
} else
newctrl |= ACM_CTRL_DTR;
if (newctrl != acm->ctrlout)
acm_set_control(acm, acm->ctrlout = newctrl);
if (memcmp(&acm->line, &newline, sizeof newline)) {
memcpy(&acm->line, &newline, sizeof newline);
dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
__func__,
le32_to_cpu(newline.dwDTERate),
newline.bCharFormat, newline.bParityType,
newline.bDataBits);
acm_set_line(acm, &acm->line);
}
}
/* data interface returns incoming bytes, or we got unthrottled */
static void acm_read_bulk(struct urb *urb, struct pt_regs *regs)
{
struct acm_rb *buf;
struct acm_ru *rcv = urb->context;
struct acm *acm = rcv->instance;
dbg("Entering acm_read_bulk with status %d\n", urb->status);
if (!ACM_READY(acm))
return;
if (urb->status)
dev_dbg(&acm->data->dev, "bulk rx status %d\n", urb->status);
buf = rcv->buffer;
buf->size = urb->actual_length;
spin_lock(&acm->read_lock);
list_add_tail(&rcv->list, &acm->spare_read_urbs);
list_add_tail(&buf->list, &acm->filled_read_bufs);
spin_unlock(&acm->read_lock);
tasklet_schedule(&acm->urb_task);
}
static void acm_read_bulk(struct urb *urb)
{
struct acm *acm = urb->context;
struct tty_struct *tty = acm->tty;
unsigned char *data = urb->transfer_buffer;
int i = 0;
if (!ACM_READY(acm)) return;
if (urb->status)
dbg("nonzero read bulk status received: %d", urb->status);
if (!urb->status & !acm->throttle) {
for (i = 0; i < urb->actual_length && !acm->throttle; i++) {
/* if we insert more than TTY_FLIPBUF_SIZE characters,
* we drop them. */
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty_flip_buffer_push(tty);
}
tty_insert_flip_char(tty, data[i], 0);
}
tty_flip_buffer_push(tty);
}
if (acm->throttle) {
memmove(data, data + i, urb->actual_length - i);
urb->actual_length -= i;
return;
}
urb->actual_length = 0;
urb->dev = acm->dev;
if (usb_submit_urb(urb))
dbg("failed resubmitting read urb");
}
static void acm_rx_tasklet(unsigned long _acm)
{
struct acm *acm = (void *)_acm;
struct acm_rb *buf;
struct tty_struct *tty = acm->tty;
struct acm_ru *rcv;
unsigned long flags;
unsigned char throttled;
dbg("Entering acm_rx_tasklet");
if (!ACM_READY(acm))
{
dbg("acm_rx_tasklet: ACM not ready");
return;
}
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (throttled)
{
dbg("acm_rx_tasklet: throttled");
return;
}
next_buffer:
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->filled_read_bufs)) {
spin_unlock_irqrestore(&acm->read_lock, flags);
goto urbs;
}
buf = list_entry(acm->filled_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
tty_buffer_request_room(tty, buf->size);
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (!throttled)
tty_insert_flip_string(tty, buf->base, buf->size);
tty_flip_buffer_push(tty);
if (throttled) {
dbg("Throttling noticed");
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
goto next_buffer;
urbs:
while (!list_empty(&acm->spare_read_bufs)) {
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->spare_read_urbs)) {
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
rcv = list_entry(acm->spare_read_urbs.next,
struct acm_ru, list);
list_del(&rcv->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
buf = list_entry(acm->spare_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
rcv->buffer = buf;
usb_fill_bulk_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv);
rcv->urb->transfer_dma = buf->dma;
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* This shouldn't kill the driver as unsuccessful URBs are returned to the
free-urbs-pool and resubmited ASAP */
spin_lock_irqsave(&acm->read_lock, flags);
if (acm->susp_count || usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
list_add(&buf->list, &acm->spare_read_bufs);
list_add(&rcv->list, &acm->spare_read_urbs);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
} else {
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
}
}
spin_lock_irqsave(&acm->read_lock, flags);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
}
/* control interface reports status changes with "interrupt" transfers */
static void acm_ctrl_irq(struct urb *urb)
{
struct acm *acm = urb->context;
struct usb_cdc_notification *dr = urb->transfer_buffer;
unsigned char *data;
int newctrl;
int retval;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, status);
goto exit;
}
if (!ACM_READY(acm))
goto exit;
data = (unsigned char *)(dr + 1);
switch (dr->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
break;
case USB_CDC_NOTIFY_SERIAL_STATE:
newctrl = le16_to_cpu(get_unaligned((__le16 *) data));
if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dbg("calling hangup");
tty_hangup(acm->tty);
}
acm->ctrlin = newctrl;
dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
break;
default:
dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
dr->bNotificationType, dr->wIndex,
dr->wLength, data[0], data[1]);
break;
}
exit:
usb_mark_last_busy(acm->dev);
retval = usb_submit_urb (urb, GFP_ATOMIC);
if (retval)
err ("%s - usb_submit_urb failed with result %d",
__FUNCTION__, retval);
}
static void acm_rx_tasklet(unsigned long _acm)
{
struct acm *acm = (void *)_acm;
struct acm_rb *buf;
struct tty_struct *tty = acm->tty;
struct acm_ru *rcv;
//unsigned long flags;
int i = 0;
dbg("Entering acm_rx_tasklet");
if (!ACM_READY(acm) || acm->throttle)
return;
next_buffer:
spin_lock(&acm->read_lock);
if (list_empty(&acm->filled_read_bufs)) {
spin_unlock(&acm->read_lock);
goto urbs;
}
buf = list_entry(acm->filled_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
spin_unlock(&acm->read_lock);
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d\n", buf, buf->size);
tty_buffer_request_room(tty, buf->size);
if (!acm->throttle)
tty_insert_flip_string(tty, buf->base, buf->size);
tty_flip_buffer_push(tty);
spin_lock(&acm->throttle_lock);
if (acm->throttle) {
dbg("Throtteling noticed");
memmove(buf->base, buf->base + i, buf->size - i);
buf->size -= i;
spin_unlock(&acm->throttle_lock);
spin_lock(&acm->read_lock);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock(&acm->read_lock);
return;
}
spin_unlock(&acm->throttle_lock);
spin_lock(&acm->read_lock);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock(&acm->read_lock);
goto next_buffer;
urbs:
while (!list_empty(&acm->spare_read_bufs)) {
spin_lock(&acm->read_lock);
if (list_empty(&acm->spare_read_urbs)) {
spin_unlock(&acm->read_lock);
return;
}
rcv = list_entry(acm->spare_read_urbs.next,
struct acm_ru, list);
list_del(&rcv->list);
spin_unlock(&acm->read_lock);
buf = list_entry(acm->spare_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
rcv->buffer = buf;
usb_fill_bulk_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv);
rcv->urb->transfer_dma = buf->dma;
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p\n", rcv->urb, rcv, buf);
/* This shouldn't kill the driver as unsuccessful URBs are returned to the
free-urbs-pool and resubmited ASAP */
if (usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
list_add(&buf->list, &acm->spare_read_bufs);
spin_lock(&acm->read_lock);
list_add(&rcv->list, &acm->spare_read_urbs);
spin_unlock(&acm->read_lock);
return;
}
}
}
/* control interface reports status changes with "interrupt" transfers */
static void acm_ctrl_irq(struct urb *urb)
{
struct acm *acm = urb->context;
struct usb_cdc_notification *dr = urb->transfer_buffer;
struct tty_struct *tty;
unsigned char *data;
int newctrl;
int retval;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&acm->control->dev,
"%s - urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&acm->control->dev,
"%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
if (!ACM_READY(acm))
goto exit;
usb_mark_last_busy(acm->dev);
data = (unsigned char *)(dr + 1);
switch (dr->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
__func__, dr->wValue);
break;
case USB_CDC_NOTIFY_SERIAL_STATE:
tty = tty_port_tty_get(&acm->port);
newctrl = get_unaligned_le16(data);
if (tty) {
if (!acm->clocal &&
(acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dev_dbg(&acm->control->dev,
"%s - calling hangup\n", __func__);
tty_hangup(tty);
}
tty_kref_put(tty);
}
acm->ctrlin = newctrl;
dev_dbg(&acm->control->dev,
"%s - input control lines: dcd%c dsr%c break%c "
"ring%c framing%c parity%c overrun%c\n",
__func__,
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
break;
default:
dev_dbg(&acm->control->dev,
"%s - unknown notification %d received: index %d "
"len %d data0 %d data1 %d\n",
__func__,
dr->bNotificationType, dr->wIndex,
dr->wLength, data[0], data[1]);
break;
}
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
__func__, retval);
}
/* control interface reports status changes with "interrupt" transfers */
static void acm_ctrl_irq(struct urb *urb, struct pt_regs *regs)
{
struct acm *acm = urb->context;
struct usb_ctrlrequest *dr = urb->transfer_buffer;
unsigned char *data = (unsigned char *)(dr + 1);
int newctrl;
int status;
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
goto exit;
}
if (!ACM_READY(acm))
goto exit;
switch (dr->bRequest) {
case ACM_IRQ_NETWORK:
dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
break;
case ACM_IRQ_LINE_STATE:
newctrl = le16_to_cpup((__u16 *) data);
if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dbg("calling hangup");
tty_hangup(acm->tty);
}
acm->ctrlin = newctrl;
dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
break;
default:
dbg("unknown control event received: request %d index %d len %d data0 %d data1 %d",
dr->bRequest, dr->wIndex, dr->wLength, data[0], data[1]);
break;
}
exit:
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status)
err ("%s - usb_submit_urb failed with result %d",
__FUNCTION__, status);
}
static void acm_rx_tasklet(unsigned long _acm)
{
struct acm *acm = (void *)_acm;
struct acm_rb *buf;
struct tty_struct *tty;
struct acm_ru *rcv;
unsigned long flags;
unsigned char throttled;
int copied;
dbg("Entering acm_rx_tasklet");
if (!ACM_READY(acm)) {
dbg("acm_rx_tasklet: ACM not ready");
return;
}
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (throttled) {
dbg("acm_rx_tasklet: throttled");
return;
}
tty = tty_port_tty_get(&acm->port);
next_buffer:
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->filled_read_bufs)) {
spin_unlock_irqrestore(&acm->read_lock, flags);
goto urbs;
}
buf = list_entry(acm->filled_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
copied = 0;
if (tty) {
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (!throttled) {
copied = tty_insert_flip_string(tty, buf->base,
buf->size);
tty_flip_buffer_push(tty);
if (copied != buf->size)
dbg("%s: copied %d != buf->size %d!!!!!!\n",
__func__, copied, buf->size);
else
dbg("%s: copied %d == buf->size %d\n",
__func__, copied, buf->size);
} else {
tty_kref_put(tty);
dbg("Throttling noticed");
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
}
if (copied == buf->size || !tty) {
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
} else {
tty_kref_put(tty);
dbg("Partial buffer fill %d", copied);
if (copied > 0) {
memmove(buf->base,
buf->base + copied,
buf->size - copied);
buf->size -= copied;
}
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
goto next_buffer;
urbs:
tty_kref_put(tty);
while (!list_empty(&acm->spare_read_bufs)) {
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->spare_read_urbs)) {
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
rcv = list_entry(acm->spare_read_urbs.next,
struct acm_ru, list);
list_del(&rcv->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
buf = list_entry(acm->spare_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
rcv->buffer = buf;
if (acm->is_int_ep)
usb_fill_int_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv, acm->bInterval);
else
usb_fill_bulk_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv);
rcv->urb->transfer_dma = buf->dma;
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* This shouldn't kill the driver as unsuccessful URBs are
returned to the free-urbs-pool and resubmited ASAP */
spin_lock_irqsave(&acm->read_lock, flags);
if (acm->susp_count ||
usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
list_add(&buf->list, &acm->spare_read_bufs);
list_add(&rcv->list, &acm->spare_read_urbs);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
} else {
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
}
}
spin_lock_irqsave(&acm->read_lock, flags);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
}