Re: [PATCH V6 01/18] scsi: fixing the "type" for well known LUs

[Christoph Hellwig <hch@infradead.org>]

Robert, I guess this version is okay with you?

On Thu, Sep 25, 2014 at 03:32:19PM +0300, Dolev Raviv wrote:
> From: Subhash Jadavani <subhashj@codeaurora.org>
> 
> Some devices may respond with wrong type for well-known logical units.
> This patch forces well-known type for devices which doesn't report it
> correct.
> 
> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
> Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
> Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
> 
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index 56675db..1095d5a 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -805,6 +805,19 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
>  	} else {
>  		sdev->type = (inq_result[0] & 0x1f);
>  		sdev->removable = (inq_result[1] & 0x80) >> 7;
> +
> +		/*
> +		 * some devices may respond with wrong type for
> +		 * well-known logical units. Force well-known type
> +		 * to enumerate them correctly.
> +		 */
> +		if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
> +			sdev_printk(KERN_WARNING, sdev,
> +				"%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16phN\n",
> +				__func__, sdev->type, sdev->lun);
> +			sdev->type = TYPE_WLUN;
> +		}
> +
>  	}
>  
>  	if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
> diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
> index 261e708..d17178e 100644
> --- a/include/scsi/scsi.h
> +++ b/include/scsi/scsi.h
> @@ -333,6 +333,7 @@ static inline int scsi_status_is_good(int status)
>  #define TYPE_RBC	    0x0e
>  #define TYPE_OSD            0x11
>  #define TYPE_ZBC            0x14
> +#define TYPE_WLUN           0x1e    /* well-known logical unit */
>  #define TYPE_NO_LUN         0x7f
>  
>  /* SCSI protocols; these are taken from SPC-3 section 7.5 */
> -- 
> 1.8.5.2
> -- 
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> 
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