This patch adds a delayed workqueue which will be used in later patches to
provide a timeout mechanism for asynchronous operations.
Signed-off-by: Bryan O'Donoghue <pure.lo...@nexus-software.ie>
---
drivers/staging/greybus/operation.c | 15 +++++++++++++++
drivers/staging/greybus/operation.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/drivers/staging/greybus/operation.c
b/drivers/staging/greybus/operation.c
index 0123109..49ab194 100644
--- a/drivers/staging/greybus/operation.c
+++ b/drivers/staging/greybus/operation.c
@@ -23,6 +23,9 @@ static struct kmem_cache *gb_message_cache;
/* Workqueue to handle Greybus operation completions. */
static struct workqueue_struct *gb_operation_completion_wq;
+/* Workqueue to handle Greybus asynchronous operation timeouts. */
+static struct workqueue_struct *gb_operation_async_timeout_wq;
+
/* Wait queue for synchronous cancellations. */
static DECLARE_WAIT_QUEUE_HEAD(gb_operation_cancellation_queue);
@@ -285,6 +288,10 @@ static void gb_operation_work(struct work_struct *work)
gb_operation_put(operation);
}
+static void gb_operation_async_worker(struct work_struct *work)
+{
+}
+
static void gb_operation_message_init(struct gb_host_device *hd,
struct gb_message *message, u16 operation_id,
size_t payload_size, u8 type)
@@ -524,6 +531,7 @@ gb_operation_create_common(struct gb_connection
*connection, u8 type,
operation->type = type;
operation->errno = -EBADR; /* Initial value--means "never set" */
+ INIT_DELAYED_WORK(&operation->delayed_work, gb_operation_async_worker);
INIT_WORK(&operation->work, gb_operation_work);
init_completion(&operation->completion);
kref_init(&operation->kref);
@@ -1216,8 +1224,14 @@ int __init gb_operation_init(void)
if (!gb_operation_completion_wq)
goto err_destroy_operation_cache;
+ gb_operation_async_timeout_wq = alloc_workqueue("greybus_async_timeout",
+ 0, 0);
+ if (!gb_operation_async_timeout_wq)
+ goto err_destroy_workqueue;
return 0;
+err_destroy_workqueue:
+ destroy_workqueue(gb_operation_completion_wq);
err_destroy_operation_cache:
kmem_cache_destroy(gb_operation_cache);
gb_operation_cache = NULL;
@@ -1230,6 +1244,7 @@ int __init gb_operation_init(void)
void gb_operation_exit(void)
{
+ destroy_workqueue(gb_operation_async_timeout_wq);
destroy_workqueue(gb_operation_completion_wq);
gb_operation_completion_wq = NULL;
kmem_cache_destroy(gb_operation_cache);
diff --git a/drivers/staging/greybus/operation.h
b/drivers/staging/greybus/operation.h
index de09a2c..c0b8471 100644
--- a/drivers/staging/greybus/operation.h
+++ b/drivers/staging/greybus/operation.h
@@ -98,6 +98,7 @@ struct gb_operation {
struct work_struct work;
gb_operation_callback callback;
struct completion completion;
+ struct delayed_work delayed_work;
struct kref kref;
atomic_t waiters;
--
2.7.4
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