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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>
This commit is contained in:
Nick Kossifidis 2015-04-29 23:51:21 +00:00 committed by Kalle Valo
parent 3ea2ce3f7e
commit 2aa56cca35
1 changed files with 13 additions and 1 deletions
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14
drivers/net/wireless/ath/ath9k/common-spectral.c
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@ -15,6 +15,7 @@
*/ */
#include <linux/relay.h> #include <linux/relay.h>
#include <linux/random.h>
#include "ath9k.h" #include "ath9k.h"
static s8 fix_rssi_inv_only(u8 rssi_val) 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); tsf, freq, chan_type);
memset(sample_buf, 0, SPECTRAL_SAMPLE_MAX_LEN); 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 */ /* Process a normal frame */
if (sample_bytes == sample_len) if (sample_bytes == sample_len) {
ret = fft_handler(rs, spec_priv, sample_start, ret = fft_handler(rs, spec_priv, sample_start,
tsf, freq, chan_type); 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 /* Short report processed, break out of the
* loop. * loop.
*/ */