static int if_chars_in_buffer(struct tty_struct *tty)
{
struct cardstate *cs;
- int retval = -ENODEV;
+ int retval = 0;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
pr_err("%s: no cardstate\n", __func__);
- return -ENODEV;
+ return 0;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
- if (mutex_lock_interruptible(&cs->mutex))
- return -ERESTARTSYS; // FIXME -EINTR?
+ mutex_lock(&cs->mutex);
- if (!cs->connected) {
+ if (!cs->connected)
gig_dbg(DEBUG_IF, "not connected");
- retval = -ENODEV;
- } else if (!cs->open_count)
+ else if (!cs->open_count)
dev_warn(cs->dev, "%s: device not opened\n", __func__);
- else if (cs->mstate != MS_LOCKED) {
+ else if (cs->mstate != MS_LOCKED)
dev_warn(cs->dev, "can't write to unlocked device\n");
- retval = -EBUSY;
- } else
+ else
retval = cs->ops->chars_in_buffer(cs);
mutex_unlock(&cs->mutex);
if (!IS_ERR(cs->tty_dev))
dev_set_drvdata(cs->tty_dev, cs);
else {
- dev_warn(cs->dev,
- "could not register device to the tty subsystem\n");
+ pr_warning("could not register device to the tty subsystem\n");
cs->tty_dev = NULL;
}
mutex_unlock(&cs->mutex);