linux-kernel - Re: [PATCH 5.10 026/103] ice: do not abort devlink info if board identifier cant be found

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Date:   Wed, 1 Sep 2021 22:10:46 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jacob Keller <jacob.e.keller@...el.com>,
        Tony Brelinski <tonyx.brelinski@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [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.

Signed-off-by: Pavel Machek (CIP) <pavel@...x.de>

diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index f18ce43b7e74..7034704b1b50 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -22,10 +22,12 @@ static int ice_info_pba(struct ice_pf *pf, char *buf, size_t len)
 	enum ice_status status;
 
 	status = ice_read_pba_string(hw, (u8 *)buf, len);
-	if (status)
+	if (status) {
+		*buf = 0;
 		/* We failed to locate the PBA, so just skip this entry */
 		dev_dbg(ice_pf_to_dev(pf), "Failed to read Product Board Assembly string, status %s\n",
 			ice_stat_str(status));
+	}
 
 	return 0;
 }

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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