[PATCH] NVMe: Simplify Firmware Activate code slightly

[vishal.l.verma@linux.intel.com (Vishal Verma)]

Reviewed-by: Vishal Verma <vishal.l.verma at linux.intel.com>

On Mon, 2013-05-06@08:22 -0400, Matthew Wilcox wrote:
> Add definitions for the three Firmware Activate actions, and change the
> SCSI translation code to construct the command into a temporary variable
> instead of translating the endianness back-and-forth.
> 
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox at intel.com>
> ---
>  drivers/block/nvme-scsi.c |    6 ++----
>  include/linux/nvme.h      |    3 +++
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c
> index 1c0710c..fed54b0 100644
> --- a/drivers/block/nvme-scsi.c
> +++ b/drivers/block/nvme-scsi.c
> @@ -1577,10 +1577,8 @@ static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
>  		c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
>  		c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
>  	} else if (opcode == nvme_admin_activate_fw) {
> -		c.common.cdw10[0] = cpu_to_le32(buffer_id);
> -		/* AA=01b Replace & activate at reset */
> -		c.common.cdw10[0] = cpu_to_le32(le32_to_cpu(
> -						c.common.cdw10[0]) | 0x00000008);
> +		u32 cdw10 = buffer_id | NVME_FWACT_REPL_ACTV;
> +		c.common.cdw10[0] = cpu_to_le32(cdw10);
>  	}
>  
>  	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
> diff --git a/include/linux/nvme.h b/include/linux/nvme.h
> index 971ef08..f451c8d 100644
> --- a/include/linux/nvme.h
> +++ b/include/linux/nvme.h
> @@ -316,6 +316,9 @@ enum {
>  	NVME_FEAT_WRITE_ATOMIC	= 0x0a,
>  	NVME_FEAT_ASYNC_EVENT	= 0x0b,
>  	NVME_FEAT_SW_PROGRESS	= 0x0c,
> +	NVME_FWACT_REPL		= (0 << 3),
> +	NVME_FWACT_REPL_ACTV	= (1 << 3),
> +	NVME_FWACT_ACTV		= (2 << 3),
>  };
>  
>  struct nvme_identify {