n->flags = flags;
buf->tail = n;
b->commit = b->used;
- /* paired w/ barrier in flush_to_ldisc(); ensures the
+ /* paired w/ acquire in flush_to_ldisc(); ensures the
* latest commit value can be read before the head is
* advanced to the next buffer
*/
- smp_wmb();
- b->next = n;
+ smp_store_release(&b->next, n);
} else if (change)
size = 0;
else
if (count)
disc->ops->receive_buf(tty, p, f, count);
}
- head->read += count;
return count;
}
if (atomic_read(&buf->priority))
break;
- next = head->next;
- /* paired w/ barrier in __tty_buffer_request_room();
+ /* paired w/ release in __tty_buffer_request_room();
* ensures commit value read is not stale if the head
* is advancing to the next buffer
*/
- smp_rmb();
+ next = smp_load_acquire(&head->next);
count = head->commit - head->read;
if (!count) {
if (next == NULL) {
count = receive_buf(tty, head, count);
if (!count)
break;
+ head->read += count;
}
mutex_unlock(&buf->lock);