linux-kernel - Re: [RFC v1 1/4] nvmet-trace: avoid dereferencing pointer too early

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Message-ID: <77nt3zr7rap6w7bpvm6vfdqqf4xc46afq4tzlifsn3zlry5wvh@t2e6orslw6on>
Date:   Tue, 5 Sep 2023 10:24:51 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hannes Reinecke <hare@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Jason Gunthorpe <jgg@...pe.ca>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>
Subject: Re: [RFC v1 1/4] nvmet-trace: avoid dereferencing pointer too early

On Tue, Sep 05, 2023 at 08:48:46AM +0200, Christoph Hellwig wrote:
> > +static inline u16 nvmet_req_to_ctrl_id(struct nvmet_req *req)
> >  {
> > -	return req->sq->ctrl;
> > +	if (!req->sq || !req->sq->ctrl)
> > +		return 0;
> > +	return req->sq->ctrl->cntlid;
> 
> Can you add a comment here why we have this check?

/*
 * The queue and controller pointer are not valid until an
 * association has been established.
 */

?