Re: [PATCH] wusb: Remove unnecessary static function ckhdid_printf

From: Nick Desaulniers
Date: Fri Mar 01 2019 - 13:18:47 EST

On Thu, Feb 28, 2019 at 8:38 PM Joe Perches <joe@xxxxxxxxxxx> wrote:
>
> This static inline is unnecessary and can be removed
> by using the vsprintf %ph extension.
>
> This reduces overall object size by more than 2K.
>
> Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>

Deserves a reported by tag from (https://lkml.org/lkml/2019/2/28/1138)
Reported-by: Louis Taylor <louis@xxxxxxxxxx>

> ---
> drivers/usb/wusbcore/cbaf.c | 15 ++++-----------
> drivers/usb/wusbcore/dev-sysfs.c | 5 ++---
> drivers/usb/wusbcore/devconnect.c | 2 +-
> drivers/usb/wusbcore/wusbhc.c | 6 +-----
> include/linux/usb/wusb.h | 16 ----------------
> 5 files changed, 8 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/usb/wusbcore/cbaf.c b/drivers/usb/wusbcore/cbaf.c
> index 222228c5c1e1..af77064c7456 100644
> --- a/drivers/usb/wusbcore/cbaf.c
> +++ b/drivers/usb/wusbcore/cbaf.c
> @@ -302,10 +302,8 @@ static ssize_t cbaf_wusb_chid_show(struct device *dev,
> {
> struct usb_interface *iface = to_usb_interface(dev);
> struct cbaf *cbaf = usb_get_intfdata(iface);
> - char pr_chid[WUSB_CKHDID_STRSIZE];
>
> - ckhdid_printf(pr_chid, sizeof(pr_chid), &cbaf->chid);
> - return scnprintf(buf, PAGE_SIZE, "%s\n", pr_chid);
> + return sprintf(buf, "%16ph\n", cbaf->chid.data);
> }
>
> static ssize_t cbaf_wusb_chid_store(struct device *dev,
> @@ -415,10 +413,8 @@ static ssize_t cbaf_wusb_cdid_show(struct device *dev,
> {
> struct usb_interface *iface = to_usb_interface(dev);
> struct cbaf *cbaf = usb_get_intfdata(iface);
> - char pr_cdid[WUSB_CKHDID_STRSIZE];
>
> - ckhdid_printf(pr_cdid, sizeof(pr_cdid), &cbaf->cdid);
> - return scnprintf(buf, PAGE_SIZE, "%s\n", pr_cdid);
> + return sprintf(buf, "%16ph\n", cbaf->cdid.data);
> }

Great simplification overall. If you wanted to push further,
cbaf_wusb_c{h|d}id_show() are basically (almost) the same function
now. They probably could share more code. Everything else looks
good, thanks for the patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>

>
> static ssize_t cbaf_wusb_cdid_store(struct device *dev,
> @@ -503,7 +499,6 @@ static int cbaf_cc_upload(struct cbaf *cbaf)
> int result;
> struct device *dev = &cbaf->usb_iface->dev;
> struct wusb_cbaf_cc_data *ccd;
> - char pr_cdid[WUSB_CKHDID_STRSIZE];
>
> ccd = cbaf->buffer;
> *ccd = cbaf_cc_data_defaults;
> @@ -513,10 +508,8 @@ static int cbaf_cc_upload(struct cbaf *cbaf)
> ccd->BandGroups = cpu_to_le16(cbaf->host_band_groups);
>
> dev_dbg(dev, "Trying to upload CC:\n");
> - ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CHID);
> - dev_dbg(dev, " CHID %s\n", pr_cdid);
> - ckhdid_printf(pr_cdid, sizeof(pr_cdid), &ccd->CDID);
> - dev_dbg(dev, " CDID %s\n", pr_cdid);
> + dev_dbg(dev, " CHID %16ph\n", ccd->CHID.data);
> + dev_dbg(dev, " CDID %16ph\n", ccd->CDID.data);
> dev_dbg(dev, " Bandgroups 0x%04x\n", cbaf->host_band_groups);
>
> result = usb_control_msg(
> diff --git a/drivers/usb/wusbcore/dev-sysfs.c b/drivers/usb/wusbcore/dev-sysfs.c
> index 85a1acf3a729..67b0a4c412b2 100644
> --- a/drivers/usb/wusbcore/dev-sysfs.c
> +++ b/drivers/usb/wusbcore/dev-sysfs.c
> @@ -50,10 +50,9 @@ static ssize_t wusb_cdid_show(struct device *dev,
> wusb_dev = wusb_dev_get_by_usb_dev(to_usb_device(dev));
> if (wusb_dev == NULL)
> return -ENODEV;
> - result = ckhdid_printf(buf, PAGE_SIZE, &wusb_dev->cdid);
> - strcat(buf, "\n");
> + result = sprintf(buf, "%16ph\n", wusb_dev->cdid.data);
> wusb_dev_put(wusb_dev);
> - return result + 1;
> + return result;
> }
> static DEVICE_ATTR_RO(wusb_cdid);
>
> diff --git a/drivers/usb/wusbcore/devconnect.c b/drivers/usb/wusbcore/devconnect.c
> index fcb06aef2675..a93837d57d53 100644
> --- a/drivers/usb/wusbcore/devconnect.c
> +++ b/drivers/usb/wusbcore/devconnect.c
> @@ -532,7 +532,7 @@ static void wusbhc_handle_dn_connect(struct wusbhc *wusbhc,
> }
>
> dnc = container_of(dn_hdr, struct wusb_dn_connect, hdr);
> - ckhdid_printf(pr_cdid, sizeof(pr_cdid), &dnc->CDID);
> + sprintf(pr_cdid, "%16ph", dnc->CDID.data);
> dev_info(dev, "DN CONNECT: device %s @ %x (%s) wants to %s\n",
> pr_cdid,
> wusb_dn_connect_prev_dev_addr(dnc),
> diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
> index e5ba6140c1ba..d0b404d258e8 100644
> --- a/drivers/usb/wusbcore/wusbhc.c
> +++ b/drivers/usb/wusbcore/wusbhc.c
> @@ -80,17 +80,13 @@ static ssize_t wusb_chid_show(struct device *dev,
> {
> struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
> const struct wusb_ckhdid *chid;
> - ssize_t result = 0;
>
> if (wusbhc->wuie_host_info != NULL)
> chid = &wusbhc->wuie_host_info->CHID;
> else
> chid = &wusb_ckhdid_zero;
>
> - result += ckhdid_printf(buf, PAGE_SIZE, chid);
> - result += sprintf(buf + result, "\n");
> -
> - return result;
> + return sprintf(buf, "%16ph\n", chid->data);
> }
>
> /*
> diff --git a/include/linux/usb/wusb.h b/include/linux/usb/wusb.h
> index 9e4a3213f2c2..65adee629106 100644
> --- a/include/linux/usb/wusb.h
> +++ b/include/linux/usb/wusb.h
> @@ -236,22 +236,6 @@ enum {
> WUSB_TRUST_TIMEOUT_MS = 4000, /* [WUSB] section 4.15.1 */
> };
>
> -static inline size_t ckhdid_printf(char *pr_ckhdid, size_t size,
> - const struct wusb_ckhdid *ckhdid)
> -{
> - return scnprintf(pr_ckhdid, size,
> - "%02hx %02hx %02hx %02hx %02hx %02hx %02hx %02hx "
> - "%02hx %02hx %02hx %02hx %02hx %02hx %02hx %02hx",
> - ckhdid->data[0], ckhdid->data[1],
> - ckhdid->data[2], ckhdid->data[3],
> - ckhdid->data[4], ckhdid->data[5],
> - ckhdid->data[6], ckhdid->data[7],
> - ckhdid->data[8], ckhdid->data[9],
> - ckhdid->data[10], ckhdid->data[11],
> - ckhdid->data[12], ckhdid->data[13],
> - ckhdid->data[14], ckhdid->data[15]);
> -}
> -
> /*
> * WUSB Crypto stuff (WUSB1.0[6])
> */
>
>


--
Thanks,
~Nick Desaulniers