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Commit 2aa56cca authored by Nick Kossifidis's avatar Nick Kossifidis Committed by Kalle Valo
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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: default avatarNick Kossifidis <mickflemm@gmail.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 3ea2ce3f

drivers/net/wireless/ath/ath9k/common-spectral.c

+13 −1
Original line number Diff line number Diff line
@@ -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.

			 */