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From: Hans Petter Selasky <hselasky@FreeBSD.org>
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Subject: PERFORCE change 129942 for review
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http://perforce.freebsd.org/chv.cgi?CH=129942

Change 129942 by hselasky@hselasky_laptop001 on 2007/12/02 01:10:15

	
	Handle the case where "page_start == NULL".

Affected files ...

.. //depot/projects/usb/src/sys/dev/usb/usb_subr.c#58 edit

Differences ...

==== //depot/projects/usb/src/sys/dev/usb/usb_subr.c#58 (text+ko) ====

@@ -1801,12 +1801,22 @@
 
 	page = pc->page_start;
 
-	page += (offset / USB_PAGE_SIZE);
+	if (page) {
+
+		page += (offset / USB_PAGE_SIZE);
+
+		offset %= USB_PAGE_SIZE;
+
+		res->length = USB_PAGE_SIZE - offset;
+		res->physaddr = page->physaddr + offset;
+
+	} else {
 
-	offset %= USB_PAGE_SIZE;
+		offset %= USB_PAGE_SIZE;
 
-	res->length = USB_PAGE_SIZE - offset;
-	res->physaddr = page->physaddr + offset;
+		res->length = USB_PAGE_SIZE - offset;
+		res->physaddr = 0;
+	}
 	return;
 }