[PATCH v2] tpm: Fix the driver cleanup code

[Jason Gunthorpe]

On Thu, Dec 21, 2017 at 03:13:39PM -0800, Azhar Shaikh wrote:
> Commit 3c1701339284353c41 ("tpm: Keep CLKRUN enabled throughout
> the duration of transmit_cmd()") added code which accessed
> chip->ops, even after it was set to NULL in tpm_del_char_device(),
> called from tpm_chip_unregister() in error / driver exit paths.
> So fix this code.
> 
> Fixes: 3c1701339284353c41 ("tpm: Keep CLKRUN enabled throughout
> the duration of transmit_cmd()")
> 
> Suggested-by: Javier Martinez Canillas <javierm at redhat.com>
> Suggested-by: Jason Gunthorpe <jgg at ziepe.ca>
> Signed-off-by: Azhar Shaikh <azhar.shaikh at intel.com>
> Changes in v2:
> - Remove TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS flag, instead call
>   tpm_tis_clkrun_enable() directly in tpm_tis_remove()
> - Add comment to tpm_tis_clkrun_enable()

Looks Ok to me

Reviewed-by: Jason Gunthorpe <jgg at ziepe.ca>

Jason
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