linux-kernel - [PATCH 2/2] serial: cpm_uart: Use uart_circ

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Date:   Mon, 20 Mar 2023 15:50:09 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 2/2] serial: cpm_uart: Use uart_circ_empty()

Use uart_circ_empty() instead of open coding it.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/tty/serial/cpm_uart/cpm_uart_core.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 5565f302cb21..349e7da643f0 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -678,15 +678,14 @@ static int cpm_uart_tx_pump(struct uart_port *port)
 	/* Pick next descriptor and fill from buffer */
 	bdp = pinfo->tx_cur;
 
-	while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) &&
-	       xmit->tail != xmit->head) {
+	while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) && !uart_circ_empty(xmit)) {
 		count = 0;
 		p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
 		while (count < pinfo->tx_fifosize) {
 			*p++ = xmit->buf[xmit->tail];
 			uart_xmit_advance(port, 1);
 			count++;
-			if (xmit->head == xmit->tail)
+			if (uart_circ_empty(xmit))
 				break;
 		}
 		out_be16(&bdp->cbd_datlen, count);
-- 
2.30.2