linux-kernel - [PATCH] USB: serial: garmin_gps: Convert timers to use timer

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Date:   Tue, 10 Oct 2017 11:25:22 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Allen Pais <allen.lkml@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] USB: serial: garmin_gps: 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: Johan Hovold <johan@...nel.org>
Cc: Allen Pais <allen.lkml@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/usb/serial/garmin_gps.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index b2f2e87aed94..9ade4ff0edd7 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -1370,9 +1370,10 @@ static void garmin_unthrottle(struct tty_struct *tty)
  * the tty in cases where the protocol provides no own handshaking
  * to initiate the transfer.
  */
-static void timeout_handler(unsigned long data)
+static void timeout_handler(struct timer_list *t)
 {
-	struct garmin_data *garmin_data_p = (struct garmin_data *) data;
+	struct garmin_data *garmin_data_p = from_timer(garmin_data_p, t,
+						       timer);
 
 	/* send the next queued packet to the tty port */
 	if (garmin_data_p->mode == MODE_NATIVE)
@@ -1391,12 +1392,10 @@ static int garmin_port_probe(struct usb_serial_port *port)
 	if (!garmin_data_p)
 		return -ENOMEM;
 
-	init_timer(&garmin_data_p->timer);
+	timer_setup(&garmin_data_p->timer, timeout_handler, 0);
 	spin_lock_init(&garmin_data_p->lock);
 	INIT_LIST_HEAD(&garmin_data_p->pktlist);
 	/* garmin_data_p->timer.expires = jiffies + session_timeout; */
-	garmin_data_p->timer.data = (unsigned long)garmin_data_p;
-	garmin_data_p->timer.function = timeout_handler;
 	garmin_data_p->port = port;
 	garmin_data_p->state = 0;
 	garmin_data_p->flags = 0;
-- 
2.7.4


-- 
Kees Cook
Pixel Security