linux-kernel - [PATCH 2/7] serial: xilinx_uartps: return early in cdns_uart_handle

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Date:   Thu, 21 Apr 2022 12:17:03 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 2/7] serial: xilinx_uartps: return early in cdns_uart_handle_tx()

Return from the true branch of the 'if'. This saves one indentation
level and makes the code more readable.

The two comments about what obvious code does are removed too.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/serial/xilinx_uartps.c | 47 ++++++++++++------------------
 1 file changed, 18 insertions(+), 29 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 250a1d888eeb..b84ae9c07c3b 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -317,37 +317,26 @@ static void cdns_uart_handle_tx(void *dev_id)
 
 	if (uart_circ_empty(&port->state->xmit)) {
 		writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
-	} else {
-		numbytes = port->fifosize;
-		while (numbytes && !uart_circ_empty(&port->state->xmit) &&
-		       !(readl(port->membase + CDNS_UART_SR) &
-						CDNS_UART_SR_TXFULL)) {
-			/*
-			 * Get the data from the UART circular buffer
-			 * and write it to the cdns_uart's TX_FIFO
-			 * register.
-			 */
-			writel(
-				port->state->xmit.buf[port->state->xmit.tail],
-					port->membase + CDNS_UART_FIFO);
-
-			port->icount.tx++;
-
-			/*
-			 * Adjust the tail of the UART buffer and wrap
-			 * the buffer if it reaches limit.
-			 */
-			port->state->xmit.tail =
-				(port->state->xmit.tail + 1) &
-					(UART_XMIT_SIZE - 1);
-
-			numbytes--;
-		}
+		return;
+	}
 
-		if (uart_circ_chars_pending(
-				&port->state->xmit) < WAKEUP_CHARS)
-			uart_write_wakeup(port);
+	numbytes = port->fifosize;
+	while (numbytes && !uart_circ_empty(&port->state->xmit) &&
+	       !(readl(port->membase + CDNS_UART_SR) &
+					CDNS_UART_SR_TXFULL)) {
+
+		writel(port->state->xmit.buf[port->state->xmit.tail],
+				port->membase + CDNS_UART_FIFO);
+
+		port->icount.tx++;
+		port->state->xmit.tail = (port->state->xmit.tail + 1) &
+				(UART_XMIT_SIZE - 1);
+
+		numbytes--;
 	}
+
+	if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
 }
 
 /**
-- 
2.36.0