From: David Vrabel <david.vrabel@csr.com>
Date: Wed, 8 Apr 2009 17:36:30 +0000 (+0000)
Subject: WUSB: correct format of wusb_chid sysfs file
X-Git-Tag: firefly_0821_release~14424^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fca10c81d99ff9956179058460dfddc0418f3902;p=firefly-linux-kernel-4.4.55.git

WUSB: correct format of wusb_chid sysfs file

Make the wusb_chid sysfs file match the ABI documentation.

Print all zeros if the WUSB host is stopped (instead of an empty file)
and end the file with a newline.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index 3638cc68529f..ee6256f23636 100644
--- a/drivers/usb/wusbcore/wusbhc.c
+++ b/drivers/usb/wusbcore/wusbhc.c
@@ -88,33 +88,31 @@ static DEVICE_ATTR(wusb_trust_timeout, 0644, wusb_trust_timeout_show,
 					     wusb_trust_timeout_store);
 
 /*
- * Show & store the current WUSB CHID
+ * Show the current WUSB CHID.
  */
 static ssize_t wusb_chid_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	const struct wusb_ckhdid *chid;
 	ssize_t result = 0;
 
 	if (wusbhc->wuie_host_info != NULL)
-		result += ckhdid_printf(buf, PAGE_SIZE,
-					&wusbhc->wuie_host_info->CHID);
+		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;
 }
 
 /*
- * Store a new CHID
- *
- * This will (FIXME) trigger many changes.
- *
- * - Send an all zeros CHID and it will stop the controller
- * - Send a non-zero CHID and it will start it
- *   (unless it was started, it will just change the CHID,
- *   diconnecting all devices first).
+ * Store a new CHID.
  *
- * So first we scan the MMC we are sent and then we act on it.  We
- * read it in the same format as we print it, an ASCII string of 16
- * hex bytes.
+ * - Write an all zeros CHID and it will stop the controller
+ * - Write a non-zero CHID and it will start it.
  *
  * See wusbhc_chid_set() for more info.
  */