write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/tty/serial/8250/8250.h
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@@ -342,6 +342,13 @@
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 extern void serial8250_rx_dma_flush(struct uart_8250_port *);
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 extern int serial8250_request_dma(struct uart_8250_port *);
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 extern void serial8250_release_dma(struct uart_8250_port *);
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+
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+static inline bool serial8250_tx_dma_running(struct uart_8250_port *p)
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+{
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+	struct uart_8250_dma *dma = p->dma;
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+
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+	return dma && dma->tx_running;
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+}
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 #else
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 static inline int serial8250_tx_dma(struct uart_8250_port *p)
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 {
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@@ -363,6 +370,11 @@
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 	return -1;
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 }
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 static inline void serial8250_release_dma(struct uart_8250_port *p) { }
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+
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+static inline bool serial8250_tx_dma_running(struct uart_8250_port *p)
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+{
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+	return false;
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+}
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 #endif
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 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)