[lkml]   [2020]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v4 3/7] tpm: tpm_tis: rewrite "tpm_tis_req_canceled()"
On 3/31/2020 8:13 AM, Jarkko Sakkinen wrote:
> On Tue, Mar 31, 2020 at 02:32:03PM +0300, wrote:
>> From: Amir Mizinski <>
>> Using this function while read/write data resulted in aborted operation.
>> After investigating according to TCG TPM Profile (PTP) Specifications,
>> i found cancel should happen only if TPM_STS.commandReady bit is lit and
>> couldn't find a case when the current condition is valid.
>> Also only cmdReady bit need to be compared instead of the full lower status
>> register byte.
>> Signed-off-by: Amir Mizinski <>
> We don't care about spec's. We care about hardware and not all hardware
> follows specifications.
> Please fix the exact thing you want to fix (and please provide a fixes
> tag).

I edit the TPM main spec, not the PTP. As I discover TPMs that don't
meet the spec, or where the spec has changed over time, I add
informative comments to guide developers.

If you know of TPM hardware that does not meet the PTP specification,
let me know the specifics. I can bring it to the PTP work group and try
to get comments added.

I do not need to know the TPM vendor. That information would not go
into the specification anyway.

 \ /
  Last update: 2020-03-31 15:54    [W:0.076 / U:0.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site