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

[Christoph Hellwig]

On Tue, Sep 05, 2023 at 10:24:51AM +0200, Daniel Wagner wrote:
> 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.
>  */

sounds good.