Re: [tpmdd-devel] [PATCH] tpm: remove chip_num parameter from in-kernel API

[PrasannaKumar Muralidharan]

Hi Jason,

On 24 October 2017 at 21:25, Jason Gunthorpe
<jgunthorpe@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Oct 24, 2017 at 09:21:15PM +0530, PrasannaKumar Muralidharan wrote:
>
>> Please check the RFC [1]. It does use chip id. The rfc has issues and
>> has to be fixed but still there could be users of the API.
>>
>> 1. https://www.spinics.net/lists/linux-crypto/msg28282.html
>
> That patch isn't safe at all. You need to store a kref to th chip in
> the hwrng, not parse a string.

The drivers/char/hw_random/tpm-rng.c module does not store the chip
reference so I guess the usage is safe. The RFC is just a sample use
case of the API.

Regards,
PrasannaKumar