static int acm_write_start(struct acm *acm, int wbn)
{
unsigned long flags;
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 */
}
wb = &acm->wb[wbn];
if(acm_wb_is_avail(acm) <= 1)
acm->write_ready = 0;
dbg("%s susp_count: %d", __FUNCTION__, acm->susp_count);
if (acm->susp_count) {
acm->old_ready = acm->write_ready;
acm->delayed_wb = wb;
acm->write_ready = 0;
schedule_work(&acm->waker);
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
usb_mark_last_busy(acm->dev);
if (!acm_wb_is_used(acm, wbn)) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
rc = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
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;
}