linux-kernel - Re: [git patches] IDE updates (part 2)

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Date:	Sat, 13 Oct 2007 22:44:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [git patches] IDE updates (part 2)

> Comment in pmac_ide_init_hwif_ports() is highly misleading as this function
> returns early only for "normal" IDE PCI devices (pmac_ide_init_hwif_ports()
> can be called outside ide-pmac driver through ppc_ide_md).

Follow the code you pasted

> 	pmif->regbase = (unsigned long) base + 0x2000;
> ...
> 	rc = pmac_ide_setup_device(pmif, hwif);

Ok so regbase is set

> ...
> }
> 
> static int
> pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
> {
> ...
> 	pmac_ide_init_hwif_ports(&hwif->hw, pmif->regbase, 0, &hwif->irq);

Now we pass a honking great zero for the ctrl_port
> ...
> }
> 
> void
> pmac_ide_init_hwif_ports(hw_regs_t *hw,
> 			      unsigned long data_port, unsigned long ctrl_port,
> 			      int *irq)
> {
> ...
> 	for (ix = 0; ix < MAX_HWIFS; ++ix)
> 		if (data_port == pmac_ide[ix].regbase)
> 			break;
> ---> since pmif->regbase was set earlier ix will be < MAX_HWIFS

> 	if (ix >= MAX_HWIFS) {
> 		/* Probably a PCI interface... */
> 		for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; ++i)
> 			hw->io_ports[i] = data_port + i - IDE_DATA_OFFSET;
> 		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;

Which is zero..


See the problem ?

Alan
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