---

yaml
---
r: 208051
b: refs/heads/master
c: e7a9ff5
h: refs/heads/master
i:
  208049: b72480f
  208047: 6f4ced7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 679f9b7c7c7d3c746792138e9d7d76578ef52c41
+refs/heads/master: e7a9ff54271bf0ddbf641e5a0bde3ebda35808be

trunk/drivers/usb/gadget/s3c-hsotg.c

@@ -91,7 +91,9 @@ struct s3c_hsotg_req;
  * For periodic IN endpoints, we have fifo_size and fifo_load to try
  * and keep track of the amount of data in the periodic FIFO for each
  * of these as we don't have a status register that tells us how much
- * is in each of them.
+ * is in each of them. (note, this may actually be useless information
+ * as in shared-fifo mode periodic in acts like a single-frame packet
+ * buffer than a fifo)
  */
 struct s3c_hsotg_ep {
 	struct usb_ep		ep;
@@ -474,6 +476,14 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 
 		size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
 
+		/* if shared fifo, we cannot write anything until the
+		 * previous data has been completely sent.
+		 */
+		if (hs_ep->fifo_load != 0) {
+			s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+			return -ENOSPC;
+		}
+
 		dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
 			__func__, size_left,
 			hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);