APPLIED[Unstable]: [PATCH 0/1] [SRU][F][OEM-5.6][OEM-OSP1-B] UBUNTU: SAUCE: tpm: fix TIS locality timeout problems

[Seth Forshee]

On Tue, Jun 02, 2020 at 10:13:23PM +0800, Ivan Hu wrote:
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881710
> 
> [Impact]
> It has been reported that some TIS based TPMs are giving unexpected errors when
> using the O_NONBLOCK path of the TPM device. The problem is that some TPMs
> don't like it when you get and then relinquish a locality
> (as the tpm_try_get_ops()/tpm_put_ops() pair does) without sending a command.
> This currently happens all the time in the O_NONBLOCK write path.
> This affects Nuvoton TPMs and was a regression caused by the patch d23d12484307
> ("tpm: fix invalid locking in NONBLOCKING mode").
> PatchLink: https://patchwork.kernel.org/patch/11576453/
> 
> [Fix]
> Fix this by moving the tpm_try_get_ops()
> further down the code to after the O_NONBLOCK determination is made.
> This is safe because the priv->buffer_mutex still protects the priv
> state being modified.
> 
> [Regression Risk]
> Low. This patch only for fix the patch d23d12484307 ("tpm: fix invalid locking
> in NONBLOCKING mode").

Please remember that sauce patches should also be submitted for the
devel/unstable kernels whenever applicable.

Applied to unstable/master, thanks!