Fwd: AMD Geode LX hardware RNG driver produces regular patterns (geode-rng.c)

Fwd: AMD Geode LX hardware RNG driver produces regular patterns (geode-rng.c)

[Bagas Sanjaya]

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> System: Alix board 2d13 (AMD Geode LX800) running OpenWrt 23.05.0-rc3 (kernel 5.15.127)
> 
> Steps to reproduce:
> 
> cat /dev/hwrng and see output. Output in console shows regular pattern, rngd daemon (from rng-tools) refuses to run because of low entropy from /dev/hwrng. Pattern doesn't change until I reboot system.
> 
> Important notice: This problem started somewhere between 4.14.267 (kernel used in OpenWrt 19.07.9) and my current 5.15.127.
> 
> OpenWrt developers recommended addressing this problem upstream since they did not alter this driver in any way.

See Bugzilla for the full thread.

Anyway, I'm adding it to regzbot:

#regzbot ^introduced: v4.14.267..v5.15.127
#regzbot title: predictable urandom output on Alix 2d13

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217882

-- 
An old man doll... just what I always wanted! - Clara

Re: Fwd: AMD Geode LX hardware RNG driver produces regular patterns (geode-rng.c)

[Bagas Sanjaya]

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On Thu, Sep 07, 2023 at 06:37:00PM +0700, Bagas Sanjaya wrote:
> #regzbot ^introduced: v4.14.267..v5.15.127
> #regzbot title: predictable urandom output on Alix 2d13
> 

#regzbot fix: https://lore.kernel.org/lkml/20230910083418.8990-1-jonas.gorski@gmail.com/

-- 
An old man doll... just what I always wanted! - Clara

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Re: Fwd: AMD Geode LX hardware RNG driver produces regular patterns (geode-rng.c)

[Bagas Sanjaya]

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On Sun, Sep 10, 2023 at 03:54:28PM +0700, Bagas Sanjaya wrote:
> On Thu, Sep 07, 2023 at 06:37:00PM +0700, Bagas Sanjaya wrote:
> > #regzbot ^introduced: v4.14.267..v5.15.127
> > #regzbot title: predictable urandom output on Alix 2d13
> > 
> 
> #regzbot fix: https://lore.kernel.org/lkml/20230910083418.8990-1-jonas.gorski@gmail.com/
> 

Fix up:

#regzbot fix: hwrng: geode: fix accessing registers

-- 
An old man doll... just what I always wanted! - Clara

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Re: Fwd: AMD Geode LX hardware RNG driver produces regular patterns (geode-rng.c)

[Linux regression tracking #update (Thorsten Leemhuis)]

[TLDR: This mail in primarily relevant for Linux kernel regression
tracking. See link in footer if these mails annoy you.]

On 26.09.23 02:45, Bagas Sanjaya wrote:
> On Sun, Sep 10, 2023 at 03:54:28PM +0700, Bagas Sanjaya wrote:
>> On Thu, Sep 07, 2023 at 06:37:00PM +0700, Bagas Sanjaya wrote:
>>> #regzbot ^introduced: v4.14.267..v5.15.127
>>> #regzbot title: predictable urandom output on Alix 2d13
>>>
>>
>> #regzbot fix: https://lore.kernel.org/lkml/20230910083418.8990-1-jonas.gorski@gmail.com/
>>
> 
> Fix up:
> 
> #regzbot fix: hwrng: geode: fix accessing registers

Fix afaics was slightly renamed on merge, hence:

#regzbot fix: hwrng: geode - fix accessing registers
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
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