Re: [PATCH] tpm: fix WARNING: lock held when returning to user space

[Jarkko Sakkinen]

On Tue, Dec 10, 2019 at 01:17:51PM -0800, Tadeusz Struk wrote:
> When an application sends TPM commands in NONBLOCKING mode
> the driver holds chip->tpm_mutex returning from write(),
> which triggers WARNING: lock held when returning to user space!
> To silence this warning the driver needs to release the mutex
> and acquire it again in tpm_dev_async_work() before sending
> the command.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 9e1b74a63f776 (tpm: add support for nonblocking operation)
> Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>

Bundle the patch and test into same patch set (no need for
cover letter) in the case we need to iterate (as they must
be in sync anyway).

/Jarkko