linux-kernel - Re: [PATCH 84/86] libata: add ata_mwdma_to

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Date:	Fri, 04 Dec 2009 21:07:10 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 84/86] libata: add ata_mwdma_to_pio() inline helper

Hello.

Bartlomiej Zolnierkiewicz wrote:

> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] libata: add ata_mwdma_to_pio() inline helper

> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

[...]

>  static struct ata_port_operations rdc_pata_ops = {
> Index: b/include/linux/ata.h
> ===================================================================
> --- a/include/linux/ata.h
> +++ b/include/linux/ata.h
> @@ -1012,4 +1012,15 @@ static inline int lba_48_ok(u64 block, u
>  #define sata_pmp_gscr_rev(gscr)		(((gscr)[SATA_PMP_GSCR_REV] >> 8) & 0xff)
>  #define sata_pmp_gscr_ports(gscr)	((gscr)[SATA_PMP_GSCR_PORT_INFO] & 0xf)
>  
> +/* returns PIO number matching given MWDMA mode */
> +static inline u8 ata_mwdma_to_pio(u8 mwdma_mode)
> +{
> +	unsigned int mwdma = mwdma_mode - XFER_MW_DMA_0;
> +	const unsigned int needed_pio[3] = {

    'u8' would have been enough.

> +		XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
> +	};

    Er, perhaps this should be 'static' array?.. Intialization *auto* class 
arrays produces some real code... Also, why not simply {0, 3, 4}?

> +
> +	return needed_pio[mwdma] - XFER_PIO_0;
> +}
> +
>  #endif /* __LINUX_ATA_H__ */

MBR, Sergei
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