Re: [GIT PATCH] firs round of SCSI bug fixes for 2.6.29-rc1
From: Andrew Morton
Date: Fri Jan 16 2009 - 14:07:59 EST
On Fri, 16 Jan 2009 13:48:53 -0500
James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > > +++ b/drivers/scsi/qla2xxx/qla_init.c
> > > @@ -1258,35 +1258,48 @@ qla2x00_init_rings(scsi_qla_host_t *vha)
> > > {
> > > int rval;
> > > unsigned long flags = 0;
> > > - int cnt;
> > > + int cnt, que;
> > > struct qla_hw_data *ha = vha->hw;
> > > - struct req_que *req = ha->req_q_map[0];
> > > - struct rsp_que *rsp = ha->rsp_q_map[0];
> > > + struct req_que *req;
> > > + struct rsp_que *rsp;
> > > + struct scsi_qla_host *vp;
> > > struct mid_init_cb_24xx *mid_init_cb =
> > > (struct mid_init_cb_24xx *) ha->init_cb;
> >
> > This cast worries me. It's a cast between two complex data structures
> > which appear to have nothing to do with each other.
>
> Actually, it's a C++ type construct. ha->init_cb is of type init_cb_t,
> mid_init_cb actually contains this (via a second indirection) as the
> first element, so what it's doing is dynamically casting out based on
> the board type.
Ah, OK, I got lost amongst the typedefs and pointers.
This code could/should use container_of() for this operation?
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