linux-kernel - [PATCH v2 1/1] serial: core: Drop duplicate NULL check in uart

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Message-Id: <20220204152808.10808-1-andriy.shevchenko@linux.intel.com>
Date:   Fri,  4 Feb 2022 17:28:08 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/1] serial: core: Drop duplicate NULL check in uart_*shutdown()

The free_page(addr), which becomes free_pages(addr, 0) checks addr
against 0. No need to repeat this check in the callers.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Jiri Slaby <jirislaby@...nel.org>
---
v2: rebased on top of tty-next (Greg), added tag (Jiri)
 drivers/tty/serial/serial_core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index ba4baa756d51..846192a7b4bf 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -317,8 +317,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 	state->xmit.buf = NULL;
 	uart_port_unlock(uport, flags);
 
-	if (xmit_buf)
-		free_page((unsigned long)xmit_buf);
+	free_page((unsigned long)xmit_buf);
 }
 
 /**
@@ -1569,8 +1568,7 @@ static void uart_tty_port_shutdown(struct tty_port *port)
 	state->xmit.buf = NULL;
 	spin_unlock_irq(&uport->lock);
 
-	if (buf)
-		free_page((unsigned long)buf);
+	free_page((unsigned long)buf);
 
 	uart_change_pm(state, UART_PM_STATE_OFF);
 }
-- 
2.34.1