linux-kernel - Re: [GIT PATCH] firs round of SCSI bug fixes for 2.6.29-rc1

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Message-Id: <20090116110708.75c5828d.akpm@linux-foundation.org>
Date:	Fri, 16 Jan 2009 11:07:08 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	torvalds@...ux-foundation.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PATCH] firs round of SCSI bug fixes for 2.6.29-rc1

On Fri, 16 Jan 2009 13:48:53 -0500
James Bottomley <James.Bottomley@...senPartnership.com> 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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