linux-kernel - Re: [PATCH] ata_piix: use piix_host_stop() in ich_pata

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Date:	Thu, 14 Dec 2006 23:42:47 +0000
From:	"Catalin Marinas" <catalin.marinas@...il.com>
To:	"Tejun Heo" <htejun@...il.com>
Cc:	"Jeff Garzik" <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata_piix: use piix_host_stop() in ich_pata_ops

On 13/12/06, Catalin Marinas <catalin.marinas@...il.com> wrote:
> On 11/12/06, Tejun Heo <htejun@...il.com> wrote:
> > piix_init_one() allocates host private data which should be freed by
> > piix_host_stop().  ich_pata_ops wasn't converted to piix_host_stop()
> > while merging, leaking 4 bytes on driver detach.  Fix it.
>
> I tried your patch last night but the leak is still reported. I need
> to investigate further and put some printk's in the piix_host_stop
> function to check whether the freeing really takes place.

The piix_host_stop() isn't actually called on my machine, so this is
not the cause of the leak.

What causes the leak seem to be the error returned by
ata_pci_init_one() called from piix_init_one(). These are the related
kernel messages:

ata_piix 0000:00:1f.1: version 2.00ac7
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 16 (level, low) -> IRQ 18
PCI: Unable to reserve I/O region #1:8@1f0 for device 0000:00:1f.1
ata_piix: probe of 0000:00:1f.1 failed with error -16

I think the call to ata_pci_init_one() should be followed by some
clean-up in case it fails. There is also another return without
clean-up in piix_init_one() after the call to piix_disable_ahci(). I
don't have time to try this now.

-- 
Catalin
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