linux-kernel - [PATCH] tty/serial: atmel: Convert timers to use timer

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Date:   Tue, 24 Oct 2017 03:00:03 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Richard Genoud <richard.genoud@...il.com>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] tty/serial: atmel: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Richard Genoud <richard.genoud@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: linux-serial@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/tty/serial/atmel_serial.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 82d9c8eae04f..68d8685e5a50 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1185,10 +1185,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	return -EINVAL;
 }
 
-static void atmel_uart_timer_callback(unsigned long data)
+static void atmel_uart_timer_callback(struct timer_list *t)
 {
-	struct uart_port *port = (void *)data;
-	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	struct atmel_uart_port *atmel_port = from_timer(atmel_port, t,
+							uart_timer);
+	struct uart_port *port = &atmel_port->uart;
 
 	if (!atomic_read(&atmel_port->tasklet_shutdown)) {
 		tasklet_schedule(&atmel_port->tasklet_rx);
@@ -1852,9 +1853,7 @@ static int atmel_startup(struct uart_port *port)
 	atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
 	atmel_port->tx_stopped = false;
 
-	setup_timer(&atmel_port->uart_timer,
-			atmel_uart_timer_callback,
-			(unsigned long)port);
+	timer_setup(&atmel_port->uart_timer, atmel_uart_timer_callback, 0);
 
 	if (atmel_use_pdc_rx(port)) {
 		/* set UART timeout */
-- 
2.7.4


-- 
Kees Cook
Pixel Security