/*
* This function is where XPC's kthreads wait for messages to deliver.
*/
static void
xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
{
do {
/* deliver messages to their intended recipients */
while (xpc_n_of_deliverable_payloads(ch) > 0 &&
!(ch->flags & XPC_C_DISCONNECTING)) {
xpc_deliver_payload(ch);
}
if (atomic_inc_return(&ch->kthreads_idle) >
ch->kthreads_idle_limit) {
/* too many idle kthreads on this channel */
atomic_dec(&ch->kthreads_idle);
break;
}
dev_dbg(xpc_chan, "idle kthread calling "
"wait_event_interruptible_exclusive()\n");
(void)wait_event_interruptible_exclusive(ch->idle_wq,
(xpc_n_of_deliverable_payloads(ch) > 0 ||
(ch->flags & XPC_C_DISCONNECTING)));
atomic_dec(&ch->kthreads_idle);
} while (!(ch->flags & XPC_C_DISCONNECTING));
}
static void
xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
{
int (*n_of_deliverable_payloads) (struct xpc_channel *) =
xpc_arch_ops.n_of_deliverable_payloads;
do {
/* */
while (n_of_deliverable_payloads(ch) > 0 &&
!(ch->flags & XPC_C_DISCONNECTING)) {
xpc_deliver_payload(ch);
}
if (atomic_inc_return(&ch->kthreads_idle) >
ch->kthreads_idle_limit) {
/* */
atomic_dec(&ch->kthreads_idle);
break;
}
dev_dbg(xpc_chan, "idle kthread calling "
"wait_event_interruptible_exclusive()\n");
(void)wait_event_interruptible_exclusive(ch->idle_wq,
(n_of_deliverable_payloads(ch) > 0 ||
(ch->flags & XPC_C_DISCONNECTING)));
atomic_dec(&ch->kthreads_idle);
} while (!(ch->flags & XPC_C_DISCONNECTING));
}
KAL_UINT32 eemcs_ccci_UL_write_wait(CCCI_CHANNEL_T chn)
{
KAL_UINT32 port_id = 0;
KAL_UINT32 tx_queue_idx=0;
KAL_UINT32 ret = 0;
port_id = ccci_ch_to_port(chn);
tx_queue_idx = ccci_port_info[port_id].txq_id;
ret = wait_event_interruptible_exclusive(ccci_tx_waitq[tx_queue_idx].tx_waitq, (hif_ul_swq_space(tx_queue_idx) - atomic_read(&ccci_tx_waitq[tx_queue_idx].reserve_space) )> 0);
DBGLOG(CCCI, TRA, "ccci_write_wait: wakeup port%d, txq=%d, ret=%d", port_id, tx_queue_idx, ret);
return ret;
}
static ssize_t
mycdrv_read (struct file *file, char __user * buf, size_t lbuf, loff_t * ppos)
{
printk (KERN_INFO "process %i (%s) going to sleep\n", current->pid,
current->comm);
atomic_inc (&nsleepers);
wait_event_interruptible_exclusive (wq, (atomic_read (&data_ready)));
printk (KERN_INFO "process %i (%s) awakening\n", current->pid,
current->comm);
/* need to take spin lock to avoid preemption */
spin_lock (&nsleepers_lock);
if (atomic_dec_and_test (&nsleepers))
atomic_set (&data_ready, 0);
spin_unlock (&nsleepers_lock);
return mycdrv_generic_read (file, buf, lbuf, ppos);
}
static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
bool for_background)
{
struct fuse_req *req;
int err;
atomic_inc(&fc->num_waiting);
if (fuse_block_alloc(fc, for_background)) {
sigset_t oldset;
int intr;
block_sigs(&oldset);
intr = wait_event_interruptible_exclusive(fc->blocked_waitq,
!fuse_block_alloc(fc, for_background));
restore_sigs(&oldset);
err = -EINTR;
if (intr)
goto out;
}
err = -ENOTCONN;
if (!fc->connected)
goto out;
req = fuse_request_alloc(npages);
err = -ENOMEM;
if (!req) {
if (for_background)
wake_up(&fc->blocked_waitq);
goto out;
}
fuse_req_init_context(req);
req->waiting = 1;
req->background = for_background;
return req;
out:
atomic_dec(&fc->num_waiting);
return ERR_PTR(err);
}
static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
size_t count, loff_t *offp)
{
struct f_hidg *hidg = file->private_data;
ssize_t status = -ENOMEM;
if (!access_ok(VERIFY_READ, buffer, count))
return -EFAULT;
if (hacky_device_list_check(hidg)) {
pr_err("%s: trying to write to device %p that was destroyed\n", __func__, hidg);
return -EIO;
}
mutex_lock(&hidg->lock);
#define WRITE_COND (!hidg->write_pending)
/* write queue */
while (!WRITE_COND) {
mutex_unlock(&hidg->lock);
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible_exclusive(
hidg->write_queue, WRITE_COND))
return -ERESTARTSYS;
if (hacky_device_list_check(hidg)) {
pr_err("%s: trying to write to device %p that was destroyed\n", __func__, hidg);
return -EIO;
}
mutex_lock(&hidg->lock);
}
count = min_t(unsigned, count, hidg->report_length);
status = copy_from_user(hidg->req->buf, buffer, count);
if (status != 0) {
ERROR(hidg->func.config->cdev,
"copy_from_user error\n");
mutex_unlock(&hidg->lock);
return -EINVAL;
}
hidg->req->status = 0;
hidg->req->zero = 0;
hidg->req->length = count;
hidg->req->complete = f_hidg_req_complete;
hidg->req->context = hidg;
hidg->write_pending = 1;
status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC);
if (status < 0) {
ERROR(hidg->func.config->cdev,
"usb_ep_queue error on int endpoint %zd\n", status);
hidg->write_pending = 0;
wake_up(&hidg->write_queue);
} else {
status = count;
}
mutex_unlock(&hidg->lock);
return status;
}
