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card_emu: Only allocate a new buffer if needed in send_tpdu_header()

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This commit is contained in:
Harald Welte
2016-03-02 10:28:54 +01:00
parent acae412b2a
commit f1697e2dd9
1 changed files with 14 additions and 7 deletions
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21
firmware/src_simtrace/card_emu.c
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@@ -580,14 +580,21 @@ static void send_tpdu_header(struct card_handle *ch)
ch->tpdu.hdr[4]); ch->tpdu.hdr[4]);
/* if we already/still have a context, send it off */ /* if we already/still have a context, send it off */
if (ch->uart_rx_ctx && ch->uart_rx_ctx->idx) { if (ch->uart_rx_ctx) {
flush_rx_buffer(ch); TRACE_DEBUG("have old buffer\r\n");
if (ch->uart_rx_ctx->idx) {
TRACE_DEBUG("flushing old buffer\r\n");
flush_rx_buffer(ch);
}
} else {
TRACE_DEBUG("allocating new buffer\r\n");
/* ensure we have a new buffer */
ch->uart_rx_ctx = req_ctx_find_get(0, RCTX_S_FREE, RCTX_S_UART_RX_BUSY);
if (!ch->uart_rx_ctx) {
TRACE_ERROR("%s: ENOMEM\r\n", __func__);
return;
}
} }
/* ensure we have a new buffer */
ch->uart_rx_ctx = req_ctx_find_get(0, RCTX_S_FREE, RCTX_S_UART_RX_BUSY);
if (!ch->uart_rx_ctx)
return;
rctx = ch->uart_rx_ctx; rctx = ch->uart_rx_ctx;
rd = (struct cardemu_usb_msg_rx_data *) rctx->data; rd = (struct cardemu_usb_msg_rx_data *) rctx->data;