linux-kernel - Re: [git patches] libata updates for 2.6.34

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Message-Id: <201003051958.24987.bzolnier@gmail.com>
Date:	Fri, 5 Mar 2010 19:58:24 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [git patches] libata updates for 2.6.34

On Monday 01 March 2010 09:23:30 pm Jeff Garzik wrote:

>       libata: Pass host flags into the pci helper

It introduces a subtle bug:

struct ata_host {
...
	unsigned long		flags;

> @@ -1642,8 +1643,8 @@ extern int ata_pci_sff_activate_host(struct ata_host *host,
>  				     irq_handler_t irq_handler,
>  				     struct scsi_host_template *sht);
>  extern int ata_pci_sff_init_one(struct pci_dev *pdev,
> -				const struct ata_port_info * const * ppi,
> -				struct scsi_host_template *sht, void *host_priv);
> +		const struct ata_port_info * const * ppi,
> +		struct scsi_host_template *sht, void *host_priv, int hflags);

'int' type is not equal 'unsigned long' one on 64-bit architectures.

Besides doing it this way is clearly suboptimal as the same effect
could have been achieved by doing:

extern int __ata_pci_sff_init_one(struct pci_dev *pdev,
				const struct ata_port_info * const *ppi,
				struct scsi_host_template *sht, void *host_priv,
				int hflag);
static inline int ata_pci_sff_init_one(struct pci_dev *pdev,
				const struct ata_port_info * const *ppi,
				struct scsi_host_template *sht, void *host_priv)
{
	return __ata_pci_sff_init_one(pdev, ppi, sht, host_priv, 0);
}

without the need to update all drivers and without breaking pending
out-of-tree driver patches (yeah, it breaks my pata_ep93xx patches)..

--
Bartlomiej Zolnierkiewicz
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