[PATCH] USB: g_file_storage: use module_param_array_named macro

Randy Dunlap pointed out that there now is a module_param_array_named
macro available.  This patch (as666) updates g_file_storage to make use of
it.  It also adds a comment listing the specifications documents used in
the design of the driver's SCSI operation (at Pat LaVarre's request).
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/file_storage.c

@@ -114,6 +114,14 @@
  * setting are not allowed when the medium is loaded.
  *
  * This gadget driver is heavily based on "Gadget Zero" by David Brownell.
+ * The driver's SCSI command interface was based on the "Information
+ * technology - Small Computer System Interface - 2" document from
+ * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
+ * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>.  The single exception
+ * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
+ * "Universal Serial Bus Mass Storage Class UFI Command Specification"
+ * document, Revision 1.0, December 14, 1998, available at
+ * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
  */
 
 
@@ -340,11 +348,9 @@ MODULE_LICENSE("Dual BSD/GPL");
 
 #define MAX_LUNS	8
 
-	/* Arggh!  There should be a module_param_array_named macro! */
-static char		*file[MAX_LUNS];
-static int		ro[MAX_LUNS];
-
 static struct {
+	char		*file[MAX_LUNS];
+	int		ro[MAX_LUNS];
 	int		num_filenames;
 	int		num_ros;
 	unsigned int	nluns;
@@ -376,10 +382,11 @@ static struct {
 	};
 
 
-module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
+module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
+		S_IRUGO);
 MODULE_PARM_DESC(file, "names of backing files or devices");
 
-module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
+module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
 MODULE_PARM_DESC(ro, "true to force read-only");
 
 module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
@@ -3868,7 +3875,7 @@ static int __init fsg_bind(struct usb_gadget *gadget)
 
 	for (i = 0; i < fsg->nluns; ++i) {
 		curlun = &fsg->luns[i];
-		curlun->ro = ro[i];
+		curlun->ro = mod_data.ro[i];
 		curlun->dev.parent = &gadget->dev;
 		curlun->dev.driver = &fsg_driver.driver;
 		dev_set_drvdata(&curlun->dev, fsg);
@@ -3885,8 +3892,9 @@ static int __init fsg_bind(struct usb_gadget *gadget)
 			kref_get(&fsg->ref);
 		}
 
-		if (file[i] && *file[i]) {
-			if ((rc = open_backing_file(curlun, file[i])) != 0)
+		if (mod_data.file[i] && *mod_data.file[i]) {
+			if ((rc = open_backing_file(curlun,
+					mod_data.file[i])) != 0)
 				goto out;
 		} else if (!mod_data.removable) {
 			ERROR(fsg, "no file given for LUN%d\n", i);