lkml.org 
[lkml]   [2021]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 5.10 026/103] ice: do not abort devlink info if board identifier cant be found
Hi!

> >>> The devlink dev info command reports version information about the
> >>> device and firmware running on the board. This includes the "board.id"
> >>> field which is supposed to represent an identifier of the board design.
> >>> The ice driver uses the Product Board Assembly identifier for this.
> >>>
> >>> In some cases, the PBA is not present in the NVM. If this happens,
> >>> devlink dev info will fail with an error. Instead, modify the
> >>> ice_info_pba function to just exit without filling in the context
> >>> buffer. This will cause the board.id field to be skipped. Log a dev_dbg
> >>> message in case someone wants to confirm why board.id is not showing up
> >>> for them.
> >>
> >> Will it cause field to be skipped? I believe buffer will not be
> >> initialized which will result in some confusion...
> >
> > IOW I believe this is good idea.
>
> It's not necessary, but I agree its not obvious without the full
> context. The caller of ice_info_pba memsets the buffer before calling
> each info reporter. Its already a known semantics that leaving the
> buffer alone will skip the entry.
>
> See the code below for what we do.
>
> > memset(ctx->buf, 0, sizeof(ctx->buf));
> >
> > err = ice_devlink_versions[i].getter(pf, ctx);
> > if (err) {
> > NL_SET_ERR_MSG_MOD(extack, "Unable to obtain version info");
> > goto out_free_ctx;
> > }

That memset is not present in 5.10 I was reviewing. I agree that
backporting the memset to 5.10 is better then my patch.

> We memset the buffer, call the getter, and if that doesn't modify the
> buffer, we call the fallack, and then check again if its still empty.
>
> Because we memset each time, we don't need to assign *buf = 0.
>
> I guess its more clear that we're doing the correct thing here, but
> these functions are build-for-purpose to use as pointers in this API and
> aren't public, so I think it is fine to leave it as is.

Yes, code is okay in mainline, but the memset is not present in
5.10-stable.

Best regards,
Pavel
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2021-09-02 07:58    [W:0.407 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site