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Fix pppos after changing PBUF_POOL to PBUF_RAM

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This partly reverts 31bc2f9b which broke pppos tx as 'pppos_output_append'
implements a custom scheme of checking available pbuf size.
Added a comment why PBUF_POOL is ok for tx in this special case.
See bug #51908

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt 2018-06-13 09:38:04 +02:00
parent 392c676ef5
commit 3f2227f04c
1 changed files with 8 additions and 4 deletions
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12
src/netif/ppp/pppos.c
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@ -207,8 +207,10 @@ pppos_write(ppp_pcb *ppp, void *ctx, struct pbuf *p)
err_t err;
LWIP_UNUSED_ARG(ppp);
/* Grab an output buffer. */
nb = pbuf_alloc(PBUF_RAW, 0, PBUF_RAM);
/* Grab an output buffer. Using PBUF_POOL here for tx is ok since the pbuf
gets freed by 'pppos_output_last' before this function returns and thus
cannot starve rx. */
nb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
if (nb == NULL) {
PPPDEBUG(LOG_WARNING, ("pppos_write[%d]: alloc fail\n", ppp->netif->num));
LINK_STATS_INC(link.memerr);
@ -256,8 +258,10 @@ pppos_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *pb, u16_t protocol)
err_t err;
LWIP_UNUSED_ARG(ppp);
/* Grab an output buffer. */
nb = pbuf_alloc(PBUF_RAW, 0, PBUF_RAM);
/* Grab an output buffer. Using PBUF_POOL here for tx is ok since the pbuf
gets freed by 'pppos_output_last' before this function returns and thus
cannot starve rx. */
nb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
if (nb == NULL) {
PPPDEBUG(LOG_WARNING, ("pppos_netif_output[%d]: alloc fail\n", ppp->netif->num));
LINK_STATS_INC(link.memerr);