#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/kallsyms.h>
+#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/poll.h>
#include <linux/list.h>
ssize_t retval = 0;
mutex_lock(&buffer->mutex);
- if (buffer->needs_read_fill) {
+ if (buffer->needs_read_fill || *ppos == 0) {
retval = fill_read_buffer(file->f_path.dentry,buffer);
if (retval)
goto out;
* return POLLERR|POLLPRI, and select will return the fd whether
* it is waiting for read, write, or exceptions.
* Once poll/select indicates that the value has changed, you
- * need to close and re-open the file, as simply seeking and reading
- * again will not get new data, or reset the state of 'poll'.
+ * need to close and re-open the file, or seek to 0 and read again.
* Reminder: this only works for attributes which actively support
* it, and it is not possible to test an attribute from userspace
* to see if it supports poll (Neither 'poll' nor 'select' return