[Skiboot] [PATCH v3 1/3] powerpc/powernv: convert codes returned by OPAL calls
mpe at ellerman.id.au
Mon Mar 30 17:54:16 AEDT 2015
On Mon, 2015-03-30 at 08:37 +0200, Cedric Le Goater wrote:
> On 03/30/2015 04:05 AM, Michael Ellerman wrote:
> > On Fri, 2015-03-27 at 17:39 +0100, Cédric Le Goater wrote:
> >> OPAL has its own list of return codes. The patch provides a translation
> >> of such codes in errnos for the opal_sensor_read call, and possibly
> >> others if needed.
> >> + case OPAL_UNSUPPORTED: return -ENOSYS;
> > You shouldn't use ENOSYS here, that should only ever mean "no such syscall",
> > otherwise you get very confusing results like read() returning ENOSYS.
> Indeed. How about ENODEV then ?
That can also be confusing from userspace.
I think it's probably best just to use EIO, as far as userspace is concerned if
the kernel lets it call an unsupported OPAL routine that is more or less a
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