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-rw-r--r--fs/sysfs/file.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index baa663e6938..ade9a7e6a75 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -13,6 +13,7 @@
#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>
@@ -128,7 +129,7 @@ sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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;
@@ -409,8 +410,7 @@ static int sysfs_release(struct inode *inode, struct file *filp)
* 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