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FROMLIST: serial: qcom_geni: Fix RX DMA stall when SE_DMA_RX_LEN_IN is zero #626

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FROMLIST: serial: qcom_geni: Fix RX DMA stall when SE_DMA_RX_LEN_IN is zero #626

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9 changes: 3 additions & 6 deletions drivers/tty/serial/qcom_geni_serial.c
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Original file line number Diff line number Diff line change
Expand Up @@ -896,12 +896,9 @@ static void qcom_geni_serial_handle_rx_dma(struct uart_port *uport, bool drop)
port->rx_dma_addr = 0;

rx_in = readl(uport->membase + SE_DMA_RX_LEN_IN);
if (!rx_in) {
dev_warn(uport->dev, "serial engine reports 0 RX bytes in!\n");
return;
}

if (!drop)
if (!rx_in)
dev_warn_ratelimited(uport->dev, "serial engine reports 0 RX bytes in!\n");
else if (!drop)
handle_rx_uart(uport, rx_in);

ret = geni_se_rx_dma_prep(&port->se, port->rx_buf,
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