timer: Remove init_timer_on_stack() in favor of timer_setup_on_stack()

Remove uses of init_timer_on_stack() with open-coded function and data
assignments that could be expressed using timer_setup_on_stack(). Several
were removed from the stack entirely since there was a one-to-one mapping
of parent structure to timer, those are switched to using timer_setup()
instead. All related callbacks were adjusted to use from_timer().

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: Petr Mladek <pmladek@suse.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Kalle Valo <kvalo@qca.qualcomm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: linux1394-devel@lists.sourceforge.net
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: linux-s390@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: linux-scsi@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ursula Braun <ubraun@linux.vnet.ibm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Harish Patil <harish.patil@cavium.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Michael Reed <mdr@sgi.com>
Cc: Manish Chopra <manish.chopra@cavium.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-pm@vger.kernel.org
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Mark Gross <mark.gross@intel.com>
Cc: linux-watchdog@vger.kernel.org
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: netdev@vger.kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lkml.kernel.org/r/1507159627-127660-4-git-send-email-keescook@chromium.org

drivers/parport/ieee1284.c

@@ -44,10 +44,11 @@ static void parport_ieee1284_wakeup (struct parport *port)
 	up (&port->physport->ieee1284.irq);
 }
 
-static struct parport *port_from_cookie[PARPORT_MAX];
-static void timeout_waiting_on_port (unsigned long cookie)
+static void timeout_waiting_on_port (struct timer_list *t)
 {
-	parport_ieee1284_wakeup (port_from_cookie[cookie % PARPORT_MAX]);
+	struct parport *port = from_timer(port, t, timer);
+
+	parport_ieee1284_wakeup (port);
 }
 
 /**
@@ -69,27 +70,19 @@ static void timeout_waiting_on_port (unsigned long cookie)
 int parport_wait_event (struct parport *port, signed long timeout)
 {
 	int ret;
-	struct timer_list timer;
 
 	if (!port->physport->cad->timeout)
 		/* Zero timeout is special, and we can't down() the
 		   semaphore. */
 		return 1;
 
-	init_timer_on_stack(&timer);
-	timer.expires = jiffies + timeout;
-	timer.function = timeout_waiting_on_port;
-	port_from_cookie[port->number % PARPORT_MAX] = port;
-	timer.data = port->number;
-
-	add_timer (&timer);
+	timer_setup(&port->timer, timeout_waiting_on_port, 0);
+	mod_timer(&port->timer, jiffies + timeout);
 	ret = down_interruptible (&port->physport->ieee1284.irq);
-	if (!del_timer_sync(&timer) && !ret)
+	if (!del_timer_sync(&port->timer) && !ret)
 		/* Timed out. */
 		ret = 1;
 
-	destroy_timer_on_stack(&timer);
-
 	return ret;
 }