[PATCH 04/18] nvme: add a vendor field to struct nvme_dev

[james_p_freyensee@linux.intel.com (J Freyensee)]

On Fri, 2015-10-16@07:58 +0200, Christoph Hellwig wrote:
> The SCSI translation layer currently has to poke into the PCI device
> structure to find a vendor ID for the device identification fallback.
> We won't nessecarily have a PCI device behind the device structure in
> the future, so add a new vendor field that can be filled out by the
> PCIe driver instead.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> Acked-by: Keith Busch <keith.busch at intel.com>
> ---
>  drivers/nvme/host/nvme.h | 1 +
>  drivers/nvme/host/pci.c  | 3 +++
>  drivers/nvme/host/scsi.c | 2 +-
>  3 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index 0633a7b..706f678 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -69,6 +69,7 @@ struct nvme_dev {
>  	u16 abort_limit;
>  	u8 event_limit;
>  	u8 vwc;
> +	u16 vendor;
>  };
>  
>  /*
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 628c572..cd731f5 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -3025,6 +3025,9 @@ static int nvme_probe(struct pci_dev *pdev, 
> const struct pci_device_id *id)
>  	INIT_WORK(&dev->reset_work, nvme_reset_work);
>  	dev->dev = get_device(&pdev->dev);
>  	pci_set_drvdata(pdev, dev);
> +
> +	dev->vendor = pdev->vendor;
> +
>  	result = nvme_set_instance(dev);
>  	if (result)
>  		goto put_pci;
> diff --git a/drivers/nvme/host/scsi.c b/drivers/nvme/host/scsi.c
> index c3d8d38..8f2d2c5 100644
> --- a/drivers/nvme/host/scsi.c
> +++ b/drivers/nvme/host/scsi.c
> @@ -657,7 +657,7 @@ static int nvme_trans_device_id_page(struct 
> nvme_ns *ns, struct sg_io_hdr *hdr,
>  		inq_response[6] = 0x00;    /* Rsvd */
>  		inq_response[7] = 0x44;    /* Designator Length */
>  
> -		sprintf(&inq_response[8], "%04x", to_pci_dev(dev
> ->dev)->vendor);
> +		sprintf(&inq_response[8], "%04x", dev->vendor);

I'm ok with this patch, but I wanted to ask the question for my own
benefit, what is the Linux kernel open-source practice of using
sprintf() and string settings?  I typically try to use snprintf().


>  		memcpy(&inq_response[12], dev->model, sizeof(dev
> ->model));
>  		sprintf(&inq_response[52], "%04x", tmp_id);
>  		memcpy(&inq_response[56], dev->serial, sizeof(dev
> ->serial));