This is needed by some debug parts of mac80211.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
compat/compat-2.6.35.c | 17 +++++++++++++++++
include/linux/compat-2.6.35.h | 2 ++
2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/compat/compat-2.6.35.c b/compat/compat-2.6.35.c
index 0d702ed..abb08c7 100644
--- a/compat/compat-2.6.35.c
+++ b/compat/compat-2.6.35.c
@@ -31,4 +31,21 @@ int hex_to_bin(char ch)
}
EXPORT_SYMBOL(hex_to_bin);
+/**
+ * noop_llseek - No Operation Performed llseek implementation
+ * @file: file structure to seek on
+ * @offset: file offset to seek to
+ * @origin: type of seek
+ *
+ * This is an implementation of ->llseek useable for the rare special case when
+ * userspace expects the seek to succeed but the (device) file is actually not
+ * able to perform the seek. In this case you use noop_llseek() instead of
+ * falling back to the default implementation of ->llseek.
+ */
+loff_t noop_llseek(struct file *file, loff_t offset, int origin)
+{
+ return file->f_pos;
+}
+EXPORT_SYMBOL(noop_llseek);
+
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) */
diff --git a/include/linux/compat-2.6.35.h b/include/linux/compat-2.6.35.h
index f0562cd..32fd039 100644
--- a/include/linux/compat-2.6.35.h
+++ b/include/linux/compat-2.6.35.h
@@ -27,6 +27,8 @@ static inline wait_queue_head_t *sk_sleep(struct sock *sk)
int hex_to_bin(char ch);
+extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
+
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)) */
#endif /* LINUX_26_35_COMPAT_H */
--
1.7.0.4
--
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