static int acm_write_start(struct acm *acm, int wbn)
{
unsigned long flags;
struct acm_wb *wb = &acm->wb[wbn];
int rc;
#ifdef CONFIG_PM
struct urb *res;
#endif
spin_lock_irqsave(&acm->write_lock, flags);
if (!acm->dev) {
wb->use = 0;
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
acm->susp_count);
usb_autopm_get_interface_async(acm->control);
if (acm->susp_count) {
#ifdef CONFIG_PM
acm->transmitting++;
wb->urb->transfer_buffer = wb->buf;
wb->urb->transfer_dma = wb->dmah;
wb->urb->transfer_buffer_length = wb->len;
wb->urb->dev = acm->dev;
usb_anchor_urb(wb->urb, &acm->deferred);
#else
if (!acm->delayed_wb)
acm->delayed_wb = wb;
else {
usb_autopm_put_interface_async(acm->control);
printk(KERN_INFO "%s: acm->delayed_wb is not NULL, "
"returning -EAGAIN\n", __func__);
spin_unlock_irqrestore(&acm->write_lock, flags);
return -EAGAIN;
}
#endif
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
usb_mark_last_busy(acm->dev);
#ifdef CONFIG_PM
while ((res = usb_get_from_anchor(&acm->deferred))) {
/* decrement ref count*/
usb_put_urb(res);
rc = usb_submit_urb(res, GFP_ATOMIC);
if (rc < 0) {
dbg("usb_submit_urb(pending request) failed: %d", rc);
usb_unanchor_urb(res);
acm_write_done(acm, res->context);
}
}
#endif
rc = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
return rc;
}
/* data interface wrote those outgoing bytes */
static void acm_write_bulk(struct urb *urb, struct pt_regs *regs)
{
struct acm *acm = (struct acm *)urb->context;
dbg("Entering acm_write_bulk with status %d\n", urb->status);
acm_write_done(acm);
acm_write_start(acm);
if (ACM_READY(acm))
schedule_work(&acm->work);
}
/* data interface wrote those outgoing bytes */
static void acm_write_bulk(struct urb *urb)
{
struct acm *acm;
struct acm_wb *wb = urb->context;
dbg("Entering acm_write_bulk with status %d", urb->status);
acm = wb->instance;
acm_write_done(acm, wb);
if (ACM_READY(acm))
schedule_work(&acm->work);
}
static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
{
int rc;
acm->transmitting++;
wb->urb->transfer_buffer = wb->buf;
wb->urb->transfer_dma = wb->dmah;
wb->urb->transfer_buffer_length = wb->len;
wb->urb->dev = acm->dev;
if ((rc = usb_submit_urb(wb->urb, GFP_ATOMIC)) < 0) {
dbg("usb_submit_urb(write bulk) failed: %d", rc);
acm_write_done(acm, wb);
}
return rc;
}
/* 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);
}
/* 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);
schedule_work(&acm->work);
}
static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
{
int rc;
acm->transmitting++;
wb->urb->transfer_buffer = wb->buf;
wb->urb->transfer_dma = wb->dmah;
wb->urb->transfer_buffer_length = wb->len;
wb->urb->dev = acm->dev;
rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
if (rc < 0) {
dev_err(&acm->data->dev,
"%s - usb_submit_urb(write bulk) failed: %d\n",
__func__, rc);
acm_write_done(acm, wb);
}
return rc;
}
/*
* Poke write.
*/
static int acm_write_start(struct acm *acm)
{
unsigned long flags;
int wbn;
struct acm_wb *wb;
int rc;
spin_lock_irqsave(&acm->write_lock, flags);
if (!acm->dev) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
if (!acm->write_ready) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
wbn = acm->write_current;
if (!acm_wb_is_used(acm, wbn)) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
wb = &acm->wb[wbn];
acm->write_ready = 0;
spin_unlock_irqrestore(&acm->write_lock, flags);
acm->writeurb->transfer_buffer = wb->buf;
acm->writeurb->transfer_dma = wb->dmah;
acm->writeurb->transfer_buffer_length = wb->len;
acm->writeurb->dev = acm->dev;
if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) {
dbg("usb_submit_urb(write bulk) failed: %d", rc);
acm_write_done(acm);
}
return rc;
}
static int acm_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
int rv = 0;
int cnt;
#ifdef CONFIG_PM
struct urb *res;
#else
struct acm_wb *wb;
#endif
if (!acm) {
pr_err("%s: !acm\n", __func__);
return -ENODEV;
}
spin_lock_irq(&acm->read_lock);
if (acm->susp_count > 0) {
acm->susp_count -= 1;
cnt = acm->susp_count;
} else {
spin_unlock_irq(&acm->read_lock);
return 0;
}
spin_unlock_irq(&acm->read_lock);
if (cnt)
return 0;
mutex_lock(&acm->mutex);
if (acm->port.count) {
rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
spin_lock_irq(&acm->write_lock);
#ifdef CONFIG_PM
while ((res = usb_get_from_anchor(&acm->deferred))) {
/* decrement ref count*/
usb_put_urb(res);
rv = usb_submit_urb(res, GFP_ATOMIC);
if (rv < 0) {
dbg("usb_submit_urb(pending request)"
" failed: %d", rv);
usb_unanchor_urb(res);
acm_write_done(acm, res->context);
}
}
spin_unlock_irq(&acm->write_lock);
#else
if (acm->delayed_wb) {
wb = acm->delayed_wb;
acm->delayed_wb = NULL;
spin_unlock_irq(&acm->write_lock);
acm_start_wb(acm, wb);
} else {
spin_unlock_irq(&acm->write_lock);
}
#endif
/*
* delayed error checking because we must
* do the write path at all cost
*/
if (rv < 0)
goto err_out;
rv = acm_submit_read_urbs(acm, GFP_NOIO);
}
err_out:
mutex_unlock(&acm->mutex);
return rv;
}