[PATCH] staging: greybus: Convert timers to use timer_setup()

[Kees Cook]

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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Bryan O'Donoghue" <pure.logic@xxxxxxxxxxxxxxxxx>
Cc: Johan Hovold <johan@xxxxxxxxxx>
Cc: Alex Elder <elder@xxxxxxxxxx>
Cc: greybus-dev@xxxxxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Bryan O'Donoghue <pure.logic@xxxxxxxxxxxxxxxxx>
---
 drivers/staging/greybus/loopback.c  | 38 ++++++++++++++++++++++++++-----------
 drivers/staging/greybus/operation.c |  7 +++----
 2 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 08e2558..81447e3 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -472,6 +472,26 @@ static void gb_loopback_async_operation_put(struct gb_loopback_async_operation
 	spin_unlock_irqrestore(&gb_dev.lock, flags);
 }
 
+static struct gb_loopback_async_operation *gb_loopback_async_operation_valid(
+	struct gb_loopback_async_operation *op_async)
+{
+	struct gb_loopback_async_operation *op_async_tmp;
+	bool found = false;
+	unsigned long flags;
+
+	spin_lock_irqsave(&gb_dev.lock, flags);
+	list_for_each_entry(op_async_tmp, &gb_dev.list_op_async, entry) {
+		if (op_async_tmp == op_async) {
+			gb_loopback_async_operation_get(op_async);
+			found = true;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&gb_dev.lock, flags);
+
+	return found ? op_async : NULL;
+}
+
 static struct gb_loopback_async_operation *
 	gb_loopback_operation_find(u16 id)
 {
@@ -572,17 +592,14 @@ static void gb_loopback_async_operation_work(struct work_struct *work)
 	gb_loopback_async_operation_put(op_async);
 }
 
-static void gb_loopback_async_operation_timeout(unsigned long data)
+static void gb_loopback_async_operation_timeout(struct timer_list *t)
 {
-	struct gb_loopback_async_operation *op_async;
-	u16 id = data;
+	struct gb_loopback_async_operation *op_async =
+		from_timer(op_async, t, timer);
 
-	op_async = gb_loopback_operation_find(id);
-	if (!op_async) {
-		pr_err("operation %d not found - time out ?\n", id);
-		return;
-	}
-	schedule_work(&op_async->work);
+	op_async = gb_loopback_async_operation_valid(op_async);
+	if (op_async)
+		schedule_work(&op_async->work);
 }
 
 static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
@@ -631,8 +648,7 @@ static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
 	if (ret)
 		goto error;
 
-	setup_timer(&op_async->timer, gb_loopback_async_operation_timeout,
-			(unsigned long)operation->id);
+	timer_setup(&op_async->timer, gb_loopback_async_operation_timeout, 0);
 	op_async->timer.expires = jiffies + gb->jiffy_timeout;
 	add_timer(&op_async->timer);
 
diff --git a/drivers/staging/greybus/operation.c b/drivers/staging/greybus/operation.c
index 3023012..ee4ba3f 100644
--- a/drivers/staging/greybus/operation.c
+++ b/drivers/staging/greybus/operation.c
@@ -294,9 +294,9 @@ static void gb_operation_work(struct work_struct *work)
 	gb_operation_put(operation);
 }
 
-static void gb_operation_timeout(unsigned long arg)
+static void gb_operation_timeout(struct timer_list *t)
 {
-	struct gb_operation *operation = (void *)arg;
+	struct gb_operation *operation = from_timer(operation, t, timer);
 
 	if (gb_operation_result_set(operation, -ETIMEDOUT)) {
 		/*
@@ -541,8 +541,7 @@ gb_operation_create_common(struct gb_connection *connection, u8 type,
 			goto err_request;
 		}
 
-		setup_timer(&operation->timer, gb_operation_timeout,
-			    (unsigned long)operation);
+		timer_setup(&operation->timer, gb_operation_timeout, 0);
 	}
 
 	operation->flags = op_flags;
-- 
2.7.4


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