linux-kernel - Re: [PATCH] ide: icside.c: Fix compile with CONFIG_BLK_DEV_IDEDMA

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Date:	Tue, 29 May 2012 16:39:45 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Christian Dietrich <christian.dietrich@...ormatik.uni-erlangen.de>
CC:	"David S. Miller" <davem@...emloft.net>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, vamos-dev@...ts.cs.fau.de
Subject: Re: [PATCH] ide: icside.c: Fix compile with CONFIG_BLK_DEV_IDEDMA_ICS=n

Hello.

On 29-05-2012 14:30, Christian Dietrich wrote:

> The icside driver can be configured without DMA support, but it
> doesn't compile in this case, because DMA operations are referenced.

> drivers/ide/icside.c:523: error: âicside_v6_port_opsâ undeclared
> drivers/ide/icside.c:522: error: âicside_dma_initâ undeclared

> Signed-off-by: Christian Dietrich<christian.dietrich@...ormatik.uni-erlangen.de>
> ---
>   drivers/ide/icside.c |    6 +++++-
>   1 files changed, 5 insertions(+), 1 deletions(-)

> I attach the configuration, that exposes this compilation error.

    Apparently, you forgot to do it. :-)

> This patch was
> *NOT* tested on real hardware. I don't if the fix really does solve the
> problem, but at least it is a hint that there is a problem.

> diff --git a/drivers/ide/icside.c b/drivers/ide/icside.c
> index 8716066..62c59c1 100644
> --- a/drivers/ide/icside.c
> +++ b/drivers/ide/icside.c
> @@ -271,7 +271,7 @@ static void icside_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
>
>   	ide_set_drivedata(drive, (void *)cycle_time);
>
> -	printk("%s: %s selected (peak %dMB/s)\n", drive->name,
> +	printk("%s: %s selected (peak %ldMB/s)\n", drive->name,

    Unrelated change, should go into its own patch.

>   		ide_xfer_verbose(xfer_mode),
>   		2000 / (unsigned long)ide_get_drivedata(drive));
>   }
> @@ -456,7 +456,9 @@ err_free:
>   static const struct ide_port_info icside_v6_port_info __initdata = {
>   	.init_dma		= icside_dma_off_init,
>   	.port_ops		=&icside_v6_no_dma_port_ops,
> +#ifdef CONFIG_BLK_DEV_IDEDMA_ICS

    You forgot to remove the useless '#define icside_v6_dma_ops NULL' above.
Also, you could set .dma_ops inside the 'if' below (and get rid of 'else' 
then), removing this line.

>   	.dma_ops		=&icside_v6_dma_ops,
> +#endif
>   	.host_flags		= IDE_HFLAG_SERIALIZE | IDE_HFLAG_MMIO,
>   	.mwdma_mask		= ATA_MWDMA2,
>   	.swdma_mask		= ATA_SWDMA2,
> @@ -518,10 +520,12 @@ icside_register_v6(struct icside_state *state, struct expansion_card *ec)
>
>   	ecard_set_drvdata(ec, state);
>
> +#ifdef CONFIG_BLK_DEV_IDEDMA_ICS
>   	if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
>   		d.init_dma = icside_dma_init;
>   		d.port_ops = &icside_v6_port_ops;
>   	} else
> +#endif
>   		d.dma_ops = NULL;
>
>   	ret = ide_host_register(host,&d, hws);

MBR, Sergei
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