linux-kernel - [PATCH] drivers/sgi-xp: Convert timers to use timer

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Date:   Tue, 24 Oct 2017 03:23:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Cliff Whickman <cpw@....com>, Robin Holt <robinmholt@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/sgi-xp: 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: Cliff Whickman <cpw@....com>
Cc: Robin Holt <robinmholt@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/misc/sgi-xp/xpc_main.c | 15 ++++++---------
 drivers/misc/sgi-xp/xpc_sn2.c  | 15 ++++++---------
 2 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
index 7f327121e6d7..0c775d6fcf59 100644
--- a/drivers/misc/sgi-xp/xpc_main.c
+++ b/drivers/misc/sgi-xp/xpc_main.c
@@ -172,9 +172,9 @@ struct xpc_arch_operations xpc_arch_ops;
  * Timer function to enforce the timelimit on the partition disengage.
  */
 static void
-xpc_timeout_partition_disengage(unsigned long data)
+xpc_timeout_partition_disengage(struct timer_list *t)
 {
-	struct xpc_partition *part = (struct xpc_partition *)data;
+	struct xpc_partition *part = from_timer(part, t, disengage_timer);
 
 	DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
 
@@ -190,7 +190,7 @@ xpc_timeout_partition_disengage(unsigned long data)
  * specify when the next timeout should occur.
  */
 static void
-xpc_hb_beater(unsigned long dummy)
+xpc_hb_beater(struct timer_list *unused)
 {
 	xpc_arch_ops.increment_heartbeat();
 
@@ -205,8 +205,7 @@ static void
 xpc_start_hb_beater(void)
 {
 	xpc_arch_ops.heartbeat_init();
-	init_timer(&xpc_hb_timer);
-	xpc_hb_timer.function = xpc_hb_beater;
+	timer_setup(&xpc_hb_timer, xpc_hb_beater, 0);
 	xpc_hb_beater(0);
 }
 
@@ -931,10 +930,8 @@ xpc_setup_partitions(void)
 		part->act_state = XPC_P_AS_INACTIVE;
 		XPC_SET_REASON(part, 0, 0);
 
-		init_timer(&part->disengage_timer);
-		part->disengage_timer.function =
-		    xpc_timeout_partition_disengage;
-		part->disengage_timer.data = (unsigned long)part;
+		timer_setup(&part->disengage_timer,
+			    xpc_timeout_partition_disengage, 0);
 
 		part->setup_state = XPC_P_SS_UNSET;
 		init_waitqueue_head(&part->teardown_wq);
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 7d71c04fc938..5a12d2a54049 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -323,16 +323,16 @@ xpc_handle_notify_IRQ_sn2(int irq, void *dev_id)
  * was received.
  */
 static void
-xpc_check_for_dropped_notify_IRQ_sn2(struct xpc_partition *part)
+xpc_check_for_dropped_notify_IRQ_sn2(struct timer_list *t)
 {
-	struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
+	struct xpc_partition *part =
+		from_timer(part, t, sn.sn2.dropped_notify_IRQ_timer);
 
 	if (xpc_part_ref(part)) {
 		xpc_check_for_sent_chctl_flags_sn2(part);
 
-		part_sn2->dropped_notify_IRQ_timer.expires = jiffies +
-		    XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
-		add_timer(&part_sn2->dropped_notify_IRQ_timer);
+		t->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
+		add_timer(t);
 		xpc_part_deref(part);
 	}
 }
@@ -1232,10 +1232,7 @@ xpc_setup_ch_structures_sn2(struct xpc_partition *part)
 
 	/* Setup a timer to check for dropped notify IRQs */
 	timer = &part_sn2->dropped_notify_IRQ_timer;
-	init_timer(timer);
-	timer->function =
-	    (void (*)(unsigned long))xpc_check_for_dropped_notify_IRQ_sn2;
-	timer->data = (unsigned long)part;
+	timer_setup(timer, xpc_check_for_dropped_notify_IRQ_sn2, 0);
 	timer->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
 	add_timer(timer);
 
-- 
2.7.4


-- 
Kees Cook
Pixel Security