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cpu/esp8266: react to "out of memory" in esp_wifi

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Gunar Schorcht 2019-01-20 11:22:15 +01:00 committed by Schorcht
parent 35a751c245
commit 0e46869e57
1 changed files with 19 additions and 0 deletions
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19
cpu/esp8266/esp-wifi/esp_wifi_netdev.c
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@ -298,7 +298,19 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
struct pbuf *pb = pbuf_alloc(PBUF_LINK, iol_len, PBUF_RAM); struct pbuf *pb = pbuf_alloc(PBUF_LINK, iol_len, PBUF_RAM);
if (pb == NULL || pb->tot_len < iol_len) { if (pb == NULL || pb->tot_len < iol_len) {
ESP_WIFI_DEBUG("could not allocate buffer to send %d bytes ", iol_len); ESP_WIFI_DEBUG("could not allocate buffer to send %d bytes ", iol_len);
/*
* The memory of EPS8266 is quite small. Therefore, it may happen on
* haevy network load that we run into out of memory and we have
* to wait until lwIP pbuf has been flushed. For that purpose, we
* have to disconnect from AP and slow down sending. The node will
* then reconnect to AP automatically.
*/
critical_exit(); critical_exit();
/* disconnect from AP */
wifi_station_disconnect();
/* wait 20 ms */
xtimer_usleep(20 * US_PER_MS);
_in_send = false; _in_send = false;
return -EIO; return -EIO;
} }
@ -354,6 +366,13 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
#endif #endif
_in_send = false; _in_send = false;
critical_exit(); critical_exit();
/*
* This error usually happens because we run into out of memory. We have
* to wait until lwIP pbuf has been flushed. For that purpose, we
* have to disconnect from AP and wait for a short time. The node will
* then reconnect to AP automatically.
*/
wifi_station_disconnect();
return -EIO; return -EIO;
} }
} }