[lwip-users] Problem with CS8900 driver

[Bernhard 'Gustl' Bauer]

Hi,

I'm using LWIP 1.3.0 with the modified CS8900 driver coming with contrib.

The transfer from CS8900 to RAM buffer is done by DMA and works fine so 
far. Then cs8900_input() does a pbuf_alloc() and copies 1 packet from 
DMA buffer to pbuf.

But what if pbuf_alloc() fails? If I drop this packet I might get 
problems with HTTP handshake. If I try again next time cs8900_service() 
is called I will run into the same problem. Neither cs8900_input() nor 
cs8900if_input() does anything without pbuf. There must be a pbuf_free 
before a pbuf_alloc is successful.

How do I do this the right way?

TIA

Gustl