From 2aa56cca3571fd08c0c38f3e2d4bb0bfb3def3c5 Mon Sep 17 00:00:00 2001 From: Nick Kossifidis Date: Wed, 29 Apr 2015 23:51:21 +0000 Subject: [PATCH] ath9k: Mix the received FFT bins to the random pool E/M noise is a pretty good source of entropy so we mix the FFT measurements of the E/M spectrum to /dev/random pool. Note that this doesn't increase the pool's entropy count but it still helps on improving the output of /dev/(u)random. Signed-off-by: Nick Kossifidis Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath9k/common-spectral.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/common-spectral.c b/drivers/net/wireless/ath/ath9k/common-spectral.c index 5840b3731d5b..a8762711ad74 100644 --- a/drivers/net/wireless/ath/ath9k/common-spectral.c +++ b/drivers/net/wireless/ath/ath9k/common-spectral.c @@ -15,6 +15,7 @@ */ #include +#include #include "ath9k.h" static s8 fix_rssi_inv_only(u8 rssi_val) @@ -647,13 +648,24 @@ int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_h tsf, freq, chan_type); memset(sample_buf, 0, SPECTRAL_SAMPLE_MAX_LEN); + + /* Mix the received bins to the /dev/random + * pool + */ + add_device_randomness(sample_buf, num_bins); } /* Process a normal frame */ - if (sample_bytes == sample_len) + if (sample_bytes == sample_len) { ret = fft_handler(rs, spec_priv, sample_start, tsf, freq, chan_type); + /* Mix the received bins to the /dev/random + * pool + */ + add_device_randomness(sample_start, num_bins); + } + /* Short report processed, break out of the * loop. */