From: Emmanuel Grumbach <[email protected]> This was added in 3.8 and not used until now. Since it it being used by the wireless stack, backport it.
Change-Id: I061a55e0af96464dfda53a0ad60a00e2c42d07f2 Signed-off-by: Emmanuel Grumbach <[email protected]> Signed-off-by: Johannes Berg <[email protected]> --- backport/backport-include/linux/random.h | 3 +++ backport/compat/compat-3.8.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 34 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..538f51d 100644 --- a/backport/compat/compat-3.8.c +++ b/backport/compat/compat-3.8.c @@ -419,6 +419,37 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe backports" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
