Re: [PATCH v2] hwrng: core - Allow runtime disabling of the HW RNG

[Jonathan McDowell <noodles@earth.li>]

On Tue, Sep 23, 2025 at 11:43:12AM +0800, Herbert Xu wrote:
>On Mon, Sep 15, 2025 at 05:02:15PM +0100, Jonathan McDowell wrote:
>>
>> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
>> index 018316f54621..1682a9f1b28c 100644
>> --- a/drivers/char/hw_random/core.c
>> +++ b/drivers/char/hw_random/core.c
>> @@ -341,6 +341,10 @@ static ssize_t rng_current_store(struct device *dev,
>>  	if (sysfs_streq(buf, "")) {
>>  		err = enable_best_rng();
>> +	} else if (sysfs_streq(buf, "none")) {
>> +		if (current_rng)
>> +			cur_rng_set_by_user = 1;
>
>Shouldn't this be set unconditionally?

Yes, I guess so. I'd been guided by enable_best_rng() which only clears 
it if it changes the current RNG, but re-reading I agree that's probably 
the wrong thing here.

J.

-- 
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