Re: [PATCH] tpm: clean up error checking in setup_ring()

[Markus Elfring]

> The bind_evtchn_to_irqhandler() function can never return 0.
…

I suggest to reconsider information once more also according to the probability
of return values from such a function.
https://elixir.bootlin.com/linux/v7.3-rc6/source/drivers/xen/events/events_base.c#L1453-L1461

bind_evtchn_to_irqhandler_chip()
https://elixir.bootlin.com/linux/v7.3-rc6/source/drivers/xen/events/events_base.c#L1432-L1451


…
> ---
> From static analysis.  Untested.
> 
>  drivers/char/tpm/xen-tpmfront.c | 2 +-
…

Would you be looking for further collateral evolution?
https://elixir.bootlin.com/linux/v7.3-rc6/source/drivers/char/tpm/xen-tpmfront.c#L267-L272

Regards,
Markus