linux-kernel - Re: [RFC/PATCH] Block device for the ISS simulator

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Date:	Fri, 03 Oct 2008 22:21:04 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [RFC/PATCH] Block device for the ISS simulator

On Fri, 2008-10-03 at 08:03 -0400, Josh Boyer wrote:
> On Fri, Oct 03, 2008 at 10:08:42AM +1000, Benjamin Herrenschmidt wrote:
> >+static void iss_blk_setup(struct iss_blk *ib)
> >+{
> >+	unsigned long flags;
> >+	u32 stat;
> >+
> >+	pr_debug("iss_blk_setup %d\n", ib->devno);
> >+
> >+	spin_lock_irqsave(&iss_blk_reglock, flags);
> >+	out_8(iss_blk_regs->data, 0);
> >+	out_be32(&iss_blk_regs->devno, ib->devno);
> >+	out_8(&iss_blk_regs->cmd, ISS_BD_CMD_OPEN);
> >+	stat = in_be32(&iss_blk_regs->stat);
> 
> Should probably use the ioread/iowrite functions instead of raw out/in.
> Same comment throughout.

Yeah well, old habits :-)

> >+		pr_debug(" -> ending request, rc = %d\n", rc);
> >+		if (rc)
> >+			end_request(req, 0);	/* failure */
> >+		else
> >+			end_request(req, 1);	/* success */
> 
> Could possibly just do:
> 
> end_request(req, (!rc));

I knew copy/pasting from a crap driver was going to come back and bite
me :)

> of_find_node_by_path increments the refcount for that node.  Need to
> do an of_node_put when you are done.

Yup, suppose so.

> Shouldn't you unmap iss_blk_regs at this point?

Might be a good idea yeah.

Ben.


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