static ssize_t uwbrdev_read(struct file *file, char *buf, size_t count,
loff_t *ppos)
{
struct buffer_descriptor *bufdsc;
struct net_adapter *adapter;
struct process_descriptor *procdsc;
int rlen = 0;
adapter = (struct net_adapter *)(file->private_data);
if ((adapter == NULL) || adapter->halted) {
pr_debug("can't find adapter or Device Removed");
return -ENODEV;
}
if (buf == NULL) {
pr_debug("BUFFER is NULL");
return -EFAULT; /* bad address */
}
procdsc = process_by_id(adapter, current->tgid);
if (procdsc == NULL) {
pr_debug("uwbrdev_read: process %d not exist", current->tgid);
return -ESRCH;
}
if (procdsc->irp == true) {
pr_warn("%s: Read was sent twice by process %d\n", __func__,
current->tgid);
return -EEXIST;
}
bufdsc = buffer_by_type(adapter, procdsc->type);
if (bufdsc == NULL) {
procdsc->irp = true;
if (wait_event_interruptible(procdsc->read_wait,
((procdsc->irp == false) ||
(adapter->halted == true)))) {
procdsc->irp = false;
adapter->pdata->g_cfg->temp_tgid = current->tgid;
return -ERESTARTSYS;
}
if (adapter->halted) {
pr_debug("uwbrdev_read: Card Removed"
"Indicated to Appln...");
procdsc->irp = false;
adapter->pdata->g_cfg->temp_tgid = current->tgid;
return -ENODEV;
}
}
if (count == 1500) { /* app passes read count as 1500 */
spin_lock(&adapter->ctl.apps.lock);
bufdsc = buffer_by_type(adapter, procdsc->type);
if (!bufdsc) {
pr_debug("uwbrdev_read: Fail...node is null");
spin_unlock(&adapter->ctl.apps.lock);
return -1;
}
spin_unlock(&adapter->ctl.apps.lock);
if (copy_to_user(buf, bufdsc->buffer, bufdsc->length)) {
pr_debug("uwbrdev_read: copy_to_user \
failed len=%u !!", bufdsc->length);
return -EFAULT;
}
ssize_t uwbrdev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct buffer_descriptor *dsc;
struct net_adapter *adapter;
struct process_descriptor *process;
int rlen = 0;
adapter = (struct net_adapter *)(file->private_data);
if ((adapter == NULL) || adapter->halted) {
dump_debug("can't find adapter or Device Removed");
return -ENODEV;
}
if (buf == NULL) {
dump_debug("BUFFER is NULL");
return -EFAULT; /* bad address */
}
process = process_by_id(adapter, current->tgid);
if (process == NULL) {
dump_debug("uwbrdev_read: "
"process %d not exist", current->tgid);
return -ESRCH;
}
if (process->irp == FALSE) {
dsc = buffer_by_type(adapter->ctl.q_received.head,
process->type);
if (dsc == NULL) {
process->irp = TRUE;
if (wait_event_interruptible(process->read_wait,
((process->irp == FALSE) ||
(adapter->halted == TRUE)))) {
process->irp = FALSE;
adapter->pdata->g_cfg->temp_tgid =
current->tgid;
return -ERESTARTSYS;
}
if (adapter->halted == TRUE) {
dump_debug("uwbrdev_read: "
"Card Removed "
"Indicated to Appln...");
process->irp = FALSE;
adapter->pdata->g_cfg->temp_tgid =
current->tgid;
return -ENODEV;
}
}
if (count == 1500) { /* app passes read count as 1500 */
spin_lock(&adapter->ctl.apps.lock);
dsc = buffer_by_type(adapter->ctl.q_received.head,
process->type);
if (!dsc) {
dump_debug("uwbrdev_read: Fail...node is null");
spin_unlock(&adapter->ctl.apps.lock);
return -1;
}
spin_unlock(&adapter->ctl.apps.lock);
if (copy_to_user(buf, dsc->buffer, dsc->length)) {
dump_debug("uwbrdev_read:copy_to_user failed"
"len=%lu !!", dsc->length);
return -EFAULT;
}
spin_lock(&adapter->ctl.apps.lock);
rlen = dsc->length;
hw_return_packet(adapter, dsc->type);
spin_unlock(&adapter->ctl.apps.lock);
}
} else {
dump_debug("uwbrdev_read: Read was sent twice "
"by process %d", current->tgid);
return -EEXIST;
}
return rlen;
}
