[lwip-devel] [bug #50694] TX exist more pbufs after enable LWIP_NETIF_TX_SINGLE_PBUF

[Robin]

URL:
  <http://savannah.nongnu.org/bugs/?50694>

                 Summary: TX exist more pbufs after enable
LWIP_NETIF_TX_SINGLE_PBUF 
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: back1127_mtk
            Submitted on: Sat 01 Apr 2017 08:35:28 AM UTC
                Category: TCP
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.2

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Details:

if project enable LWIP_NETIF_TX_SINGLE_PBUF
After app call tcp_write
if ((pos < len) && (space > 0) && (last_unsent->len > 0))
it will create new concat_p
if concat_p is not NULL，it will concatenate last_unsent
So it exist more pbuf。




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