Re: [PATCH 1/3] scsi: set to WCE if usb cache quirk is present.

[Sergei Shtylyov <sshtylyov@xxxxxxxxxx>]

Hello.

On 06-06-2012 16:20, Namjae Jeon wrote:

> Make use of USB quirk method to identify such HDD while reading the cache status in sd_probe(). If cache quirk is present for the HDD, lets assume that cache is enabled and make WCE bit equal to 1.

> Signed-off-by: Namjae Jeon<namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Pankaj Kumar<pankaj.km@xxxxxxxxxxx>
> Signed-off-by: Amit Sahrawat<a.sahrawat@xxxxxxxxxxx>
> ---
>   drivers/scsi/sd.c          |    9 +++++++--
>   include/scsi/scsi_device.h |    1 +
>   2 files changed, 8 insertions(+), 2 deletions(-)

> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 6f0a4c6..33faf6d 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2259,8 +2259,13 @@ bad_sense:
>   		sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
>
>   defaults:
> -	sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
> -	sdkp->WCE = 0;
> +	if (sdp->wce_quirk) {
> +		sdkp->WCE = 1;
> +		sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache write back\n");

   You forgot colon after "cache".

> +	} else {
> +		sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
> +		sdkp->WCE = 0;

   It makes sense to do assignments and printk() in the same order in both 
branches.

> +	}
>   	sdkp->RCD = 0;
>   	sdkp->DPOFUA = 0;
>   }

WBR, Sergei
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