linux-kernel - Re: [PATCH 24/40] Staging: hv: storvsc: On I/O get the correct IDE device

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Date:	Thu, 30 Jun 2011 15:40:55 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Abhishek Kane <v-abkane@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH 24/40] Staging: hv: storvsc: On I/O get the correct IDE
 device

On Wed, Jun 29, 2011 at 07:39:21AM -0700, K. Y. Srinivasan wrote:
> We use the channel number to distinguish an IDE device managed by the
> storvsc driver from scsi devices. Add code to get the correct
> device pointer based on the channel number.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Signed-off-by: Abhishek Kane <v-abkane@...rosoft.com>
> Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
> ---
>  drivers/staging/hv/storvsc_drv.c |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
> index cf659d7..fcc3f5d 100644
> --- a/drivers/staging/hv/storvsc_drv.c
> +++ b/drivers/staging/hv/storvsc_drv.c
> @@ -517,6 +517,16 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
>  	unsigned int sg_count = 0;
>  	struct vmscsi_request *vm_srb;
>  
> +	if (scmnd->device->channel >= HV_IDE_BASE_CHANNEL) {
> +		int channel = scmnd->device->channel;
> +
> +		/*
> +		 * This is an IDE device; get the right dev.
> +		 */
> +
> +		dev = ide_devices[channel - HV_IDE_BASE_CHANNEL];
> +	}

So instead of playing games about getting the right hv_device here,
why don't you register one scsi host for each IDE device? libata
does the same for real ATA devices.

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