diff options
| author | Nick Kossifidis <mickflemm@gmail.com> | 2015-04-29 23:51:21 +0000 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2015-05-09 16:46:18 +0300 |
| commit | 2aa56cca3571fd08c0c38f3e2d4bb0bfb3def3c5 (patch) | |
| tree | 09da61c650e82a2d6dca4b3cd4ad4a7c0304c07a /drivers/net/wireless/ath/ath9k/common-spectral.c | |
| parent | 3ea2ce3f7e63728b97fb52be4034ba3d8f5ddba5 (diff) | |
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 <mickflemm@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/common-spectral.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/common-spectral.c | 14 |
1 files changed, 13 insertions, 1 deletions
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 <linux/relay.h> +#include <linux/random.h> #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. */ |