Re: ATH9K RNG

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Stephan Mueller <smueller@xxxxxxxxxx> writes:

> considering the patch ed14dc0af7ccea867b479feb88efdfe43ca2a0f9 which adds the 
> invocation of add_hwgenerator_randomness to the ATH9K driver, may I ask about 
> more details about how you concluded that the data from the ATH chip is 
> entropic?
>
> In addition, can you please elaborate on the ATH9K_RNG_ENTROPY macro? I am 
> wondering about the multiplication of 320. If I understand the code right, the 
> return code of ath9k_rng_data_read returns the number of u32 values read from 
> the device, i.e. at most 320. With the ATH9K_RNG_ENTROPY macro, that return 
> value is multiplied by 320 (bytes?) converted into bits. I.e. it sounds to be 
> that the macro returns 320 u32 values times 320 bytes converted into bits. I 
> am wondering whether the macro should rather read  (((x) * 8 * 32) >> 10) -- 
> i.e. at most the entire array size holding the data in bits divided by 1024?

Please include linux-wireless (Cced) in the discussion. I don't remember
the details (and can't check right now) but there were discussions in
linux-wireless mailing list.

-- 
Kalle Valo--
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