Fix packet size calculation in CDC/ACM and PL2303 USB serial drivers

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4771 7fd9a85b-ad96-42d3-883c-3090e2eb8679

2 files changed, 22 insertions, 4 deletions

diff --git a/nuttx/drivers/usbdev/cdcacm.c b/nuttx/drivers/usbdev/cdcacm.c
index 24903b504e..97c9d7c773 100644
--- a/nuttx/drivers/usbdev/cdcacm.c
+++ b/nuttx/drivers/usbdev/cdcacm.c
@@ -318,6 +318,7 @@ static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv)
   FAR struct usbdev_ep_s *ep;
   FAR struct usbdev_req_s *req;
   FAR struct cdcacm_req_s *reqcontainer;
+  uint16_t reqlen;
   irqstate_t flags;
   int len;
   int ret = OK;
@@ -337,7 +338,7 @@ static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv)
   ep = priv->epbulkin;
 
   /* Loop until either (1) we run out or write requests, or (2) cdcacm_fillrequest()
-   * is unable to fill the request with data (i.e., untilthere is no more data
+   * is unable to fill the request with data (i.e., until there is no more data
    * to be sent).
    */
 
@@ -345,6 +346,14 @@ static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv)
         priv->serdev.xmit.head, priv->serdev.xmit.tail,
         priv->nwrq, sq_empty(&priv->reqlist));
 
+  /* Get the maximum number of bytes that will fit into one bulk IN request */
+
+#ifdef CONFIG_CDCACM_BULKREQLEN
+  reqlen = MAX(CONFIG_CDCACM_BULKREQLEN, ep->maxpacket);
+#else
+  reqlen = ep->maxpacket;
+#endif
+
   while (!sq_empty(&priv->reqlist))
     {
       /* Peek at the request in the container at the head of the list */
@@ -354,7 +363,7 @@ static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv)
 
       /* Fill the request with serial TX data */
 
-      len = cdcacm_fillrequest(priv, req->buf, req->len);
+      len = cdcacm_fillrequest(priv, req->buf, reqlen);
       if (len > 0)
         {
           /* Remove the empty container from the request list */
diff --git a/nuttx/drivers/usbdev/pl2303.c b/nuttx/drivers/usbdev/pl2303.c
index a1ba667f53..8bd94ddd07 100644
--- a/nuttx/drivers/usbdev/pl2303.c
+++ b/nuttx/drivers/usbdev/pl2303.c
@@ -567,6 +567,7 @@ static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv)
   FAR struct usbdev_ep_s *ep;
   FAR struct usbdev_req_s *req;
   FAR struct pl2303_req_s *reqcontainer;
+  uint16_t reqlen;
   irqstate_t flags;
   int len;
   int ret = OK;
@@ -586,7 +587,7 @@ static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv)
   ep = priv->epbulkin;
 
   /* Loop until either (1) we run out or write requests, or (2) usbclass_fillrequest()
-   * is unable to fill the request with data (i.e., untilthere is no more data
+   * is unable to fill the request with data (i.e., until there is no more data
    * to be sent).
    */
 
@@ -594,6 +595,14 @@ static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv)
         priv->serdev.xmit.head, priv->serdev.xmit.tail,
         priv->nwrq, sq_empty(&priv->reqlist));
 
+  /* Get the maximum number of bytes that will fit into one bulk IN request */
+
+#ifdef CONFIG_PL2303_BULKREQLEN
+  reqlen = MAX(CONFIG_CDCACM_BULKREQLEN, ep->maxpacket);
+#else
+  reqlen = ep->maxpacket;
+#endif
+
   while (!sq_empty(&priv->reqlist))
     {
       /* Peek at the request in the container at the head of the list */
@@ -603,7 +612,7 @@ static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv)
 
       /* Fill the request with serial TX data */
 
-      len = usbclass_fillrequest(priv, req->buf, req->len);
+      len = usbclass_fillrequest(priv, req->buf, reqlen);
       if (len > 0)
         {
           /* Remove the empty container from the request list */