/**
* wakeup_readers - wake up readers waiting on a channel
- * @data: contains the channel buffer
+ * @work: contains the channel buffer
*
- * This is the timer function used to defer reader waking.
+ * This is the function used to defer reader waking
*/
-static void wakeup_readers(unsigned long data)
+static void wakeup_readers(struct irq_work *work)
{
- struct rchan_buf *buf = (struct rchan_buf *)data;
+ struct rchan_buf *buf;
+
+ buf = container_of(work, struct rchan_buf, wakeup_work);
wake_up_interruptible(&buf->read_wait);
}
if (init) {
init_waitqueue_head(&buf->read_wait);
kref_init(&buf->kref);
- setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf);
- } else
- del_timer_sync(&buf->timer);
+ init_irq_work(&buf->wakeup_work, wakeup_readers);
+ } else {
+ irq_work_sync(&buf->wakeup_work);
+ }
buf->subbufs_produced = 0;
buf->subbufs_consumed = 0;
static void relay_close_buf(struct rchan_buf *buf)
{
buf->finalized = 1;
- del_timer_sync(&buf->timer);
+ irq_work_sync(&buf->wakeup_work);
buf->chan->cb->remove_buf_file(buf->dentry);
kref_put(&buf->kref, relay_remove_buf);
}
buf->early_bytes += buf->chan->subbuf_size -
buf->padding[old_subbuf];
smp_mb();
- if (waitqueue_active(&buf->read_wait))
+ if (waitqueue_active(&buf->read_wait)) {
/*
* Calling wake_up_interruptible() from here
* will deadlock if we happen to be logging
* from the scheduler (trying to re-grab
* rq->lock), so defer it.
*/
- mod_timer(&buf->timer, jiffies + 1);
+ irq_work_queue(&buf->wakeup_work);
+ }
}
old = buf->data;
return end_pos;
}
-/*
- * subbuf_read_actor - read up to one subbuf's worth of data
- */
-static int subbuf_read_actor(size_t read_start,
- struct rchan_buf *buf,
- size_t avail,
- read_descriptor_t *desc)
-{
- void *from;
- int ret = 0;
-
- from = buf->start + read_start;
- ret = avail;
- if (copy_to_user(desc->arg.buf, from, avail)) {
- desc->error = -EFAULT;
- ret = 0;
- }
- desc->arg.data += ret;
- desc->written += ret;
- desc->count -= ret;
-
- return ret;
-}
-
-typedef int (*subbuf_actor_t) (size_t read_start,
- struct rchan_buf *buf,
- size_t avail,
- read_descriptor_t *desc);
-
-/*
- * relay_file_read_subbufs - read count bytes, bridging subbuf boundaries
- */
-static ssize_t relay_file_read_subbufs(struct file *filp, loff_t *ppos,
- subbuf_actor_t subbuf_actor,
- read_descriptor_t *desc)
+static ssize_t relay_file_read(struct file *filp,
+ char __user *buffer,
+ size_t count,
+ loff_t *ppos)
{
struct rchan_buf *buf = filp->private_data;
size_t read_start, avail;
+ size_t written = 0;
int ret;
- if (!desc->count)
+ if (!count)
return 0;
inode_lock(file_inode(filp));
do {
+ void *from;
+
if (!relay_file_read_avail(buf, *ppos))
break;
if (!avail)
break;
- avail = min(desc->count, avail);
- ret = subbuf_actor(read_start, buf, avail, desc);
- if (desc->error < 0)
+ avail = min(count, avail);
+ from = buf->start + read_start;
+ ret = avail;
+ if (copy_to_user(buffer, from, avail))
break;
- if (ret) {
- relay_file_read_consume(buf, read_start, ret);
- *ppos = relay_file_read_end_pos(buf, read_start, ret);
- }
- } while (desc->count && ret);
- inode_unlock(file_inode(filp));
+ buffer += ret;
+ written += ret;
+ count -= ret;
- return desc->written;
-}
+ relay_file_read_consume(buf, read_start, ret);
+ *ppos = relay_file_read_end_pos(buf, read_start, ret);
+ } while (count);
+ inode_unlock(file_inode(filp));
-static ssize_t relay_file_read(struct file *filp,
- char __user *buffer,
- size_t count,
- loff_t *ppos)
-{
- read_descriptor_t desc;
- desc.written = 0;
- desc.count = count;
- desc.arg.buf = buffer;
- desc.error = 0;
- return relay_file_read_subbufs(filp, ppos, subbuf_read_actor, &desc);
+ return written;
}
static void relay_consume_bytes(struct rchan_buf *rbuf, int bytes_consumed)