[PATCH] USB storage: Another utility scatter-gather routine

This patch adds a small utility routine for storing data in a transfer
buffer.  The next patch uses this routine quite a bit in the isd200
driver.

drivers/usb/storage/protocol.c

@@ -295,3 +295,16 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
 	}
 	return cnt;
 }
+
+/* Store the contents of buffer into srb's transfer buffer and set the
+ * residue. */
+void usb_stor_set_xfer_buf(unsigned char *buffer,
+	unsigned int buflen, Scsi_Cmnd *srb)
+{
+	unsigned int index = 0, offset = 0;
+
+	usb_stor_access_xfer_buf(buffer, buflen, srb, &index, &offset,
+			TO_XFER_BUF);
+	if (buflen < srb->request_bufflen)
+		srb->resid = srb->request_bufflen - buflen;
+}

drivers/usb/storage/protocol.h

@@ -72,4 +72,6 @@ extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
 	unsigned int buflen, Scsi_Cmnd *srb, unsigned int *index,
 	unsigned int *offset, enum xfer_buf_dir dir);
 
+extern void usb_stor_set_xfer_buf(unsigned char *buffer,
+	unsigned int buflen, Scsi_Cmnd *srb);
 #endif

drivers/usb/storage/usb.c

@@ -236,8 +236,6 @@ struct usb_driver usb_storage_driver = {
 void fill_inquiry_response(struct us_data *us, unsigned char *data,
 		unsigned int data_len)
 {
-	unsigned int index, offset;
-
 	if (data_len<36) // You lose.
 		return;
 
@@ -264,11 +262,7 @@ void fill_inquiry_response(struct us_data *us, unsigned char *data,
 		data[35] = 0x30 + ((us->pusb_dev->descriptor.bcdDevice) & 0x0F);
 	}
 
-	index = offset = 0;
-	usb_stor_access_xfer_buf(data, data_len, us->srb,
-			&index, &offset, TO_XFER_BUF);
-	if (data_len < us->srb->request_bufflen)
-		us->srb->resid = us->srb->request_bufflen - data_len;
+	usb_stor_set_xfer_buf(data, data_len, us->srb);
 }
 
 static int usb_stor_control_thread(void * __us)