[PATCH 1/4] powerpc/pseries: Fix handling of PLPKS object flushing timeout

[Russell Currey]

On Tue, 2022-12-20 at 18:16 +1100, Andrew Donnellan wrote:
> plpks_confirm_object_flushed() uses the H_PKS_CONFIRM_OBJECT_FLUSHED
> hcall
> to check whether changes to an object in the Platform KeyStore have
> been
> flushed to non-volatile storage.
> 
> The hcall returns two output values, the return code and the flush
> status.
> plpks_confirm_object_flushed() polls the hcall until either the flush
> status has updated, the return code is an error, or a timeout has
> been
> exceeded.
> 
> While we're still polling, the hcall is returning H_SUCCESS (0) as
> the
> return code. In the timeout case, this means that upon exiting the
> polling
> loop, rc is 0, and therefore 0 is returned to the user.
> 
> Handle the timeout case separately and return ETIMEDOUT if triggered.
> 
> Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform
> KeyStore")
> Reported-by: Benjamin Gray <bgray at linux.ibm.com>
> Signed-off-by: Andrew Donnellan <ajd at linux.ibm.com>

Tested-by: Russell Currey <ruscur at russell.cc>
Reviewed-by: Russell Currey <ruscur at russell.cc>