Re: [PATCH 4.19 001/106] tpm: use tpm_try_get_ops() in tpm-sysfs.c.

[Jarkko Sakkinen]

On Tue, Oct 08, 2019 at 02:51:20PM +0200, Pavel Machek wrote:
> For example this did not have any locking, and is now protected by
> 
>         get_device(&chip->dev);
> 
>         down_read(&chip->ops_sem);
> 
> . Is that intended? Is this known to fix any bugs?

It is, sysfs code can otherwise race when ops is set NULL in
class shutdown.

/Jarkko