From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
This was added in 3.8 and not used until now.
Since it it being used by the wireless stack, backport it.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/backport-include/linux/random.h | 3 +++
backport/compat/compat-3.8.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/backport/backport-include/linux/random.h b/backport/backport-include/linux/random.h
index 812ce7f..e915106 100644
--- a/backport/backport-include/linux/random.h
+++ b/backport/backport-include/linux/random.h
@@ -8,6 +8,9 @@
#define prandom_seed(_seed) srandom32(_seed)
#define prandom_u32() random32()
#define prandom_u32_state(_state) prandom32(_state)
+/* backport 6582c665d6b882dad8329e05749fbcf119f1ab88 */
+#define prandom_bytes LINUX_BACKPORT(prandom_bytes)
+void prandom_bytes(void *buf, int bytes);
#endif
#endif /* __BACKPORT_RANDOM_H */
diff --git a/backport/compat/compat-3.8.c b/backport/compat/compat-3.8.c
index d43d386..70d3375 100644
--- a/backport/compat/compat-3.8.c
+++ b/backport/compat/compat-3.8.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include "hid-ids.h"
#include <linux/netdevice.h>
+#include <linux/random.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,8))
void netdev_set_default_ethtool_ops(struct net_device *dev,
@@ -419,6 +420,37 @@ int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long
}
EXPORT_SYMBOL_GPL(vm_iomap_memory);
+/**
+ * prandom_bytes - get the requested number of pseudo-random bytes
+ * @buf: where to copy the pseudo-random bytes to
+ * @bytes: the requested number of bytes
+ */
+void prandom_bytes(void *buf, int bytes)
+{
+ unsigned char *p = buf;
+ int i;
+
+ for (i = 0; i < round_down(bytes, sizeof(u32)); i += sizeof(u32)) {
+ u32 random = random32();
+ int j;
+
+ for (j = 0; j < sizeof(u32); j++) {
+ p[i + j] = random;
+ random >>= BITS_PER_BYTE;
+ }
+ }
+
+ if (i < bytes) {
+ u32 random = random32();
+
+ for (; i < bytes; i++) {
+ p[i] = random;
+ random >>= BITS_PER_BYTE;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(prandom_bytes_state);
+
#ifdef CONFIG_OF
/**
* of_find_property_value_of_size
--
1.8.4.rc3
--
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