linux-kernel - [PATCH] serial: stm32: fix the conditional expression writing

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Date:   Wed, 11 Aug 2021 18:51:36 +0800
From:   Tang Bin <tangbin@...s.chinamobile.com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com
Cc:     linux-serial@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tang Bin <tangbin@...s.chinamobile.com>,
        Zhang Shengju <zhangshengju@...s.chinamobile.com>
Subject: [PATCH] serial: stm32: fix the conditional expression writing

In the function stm32_usart_init_port, intent of the code maybe when
irq returns a value of zero, the return should be '-ENODEV'. But the
conditional expression '? :' maybe clerical error, it should be
'?:' to make '-ENODEV' work.
But in fact, as the example in platform.c is
  * int irq = platform_get_irq(pdev, 0);
  * if (irq < 0)
  * return irq;
So the return value of zero is unnecessary to check, at last remove
the unnecessary '?: -ENODEV'.

Co-developed-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
Signed-off-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
---
 drivers/tty/serial/stm32-usart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index ef793b3b4..090822cd1 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1034,8 +1034,8 @@ static int stm32_usart_init_port(struct stm32_port *stm32port,
 	int ret, irq;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return irq ? : -ENODEV;
+	if (irq < 0)
+		return irq;
 
 	port->iotype	= UPIO_MEM;
 	port->flags	= UPF_BOOT_AUTOCONF;
-- 
2.20.1.windows.1