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greybus: connection: make connection enable/disable thread safe 

Add connection mutex to protect connection enabling and disabling.

This is needed to eventually allow drivers to manage the state of their
connections during operation (i.e. post probe and pre disconnect).

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-01-19 12:51:06 +01:00 committed by Greg Kroah-Hartman
parent 192bee4b1a
commit 23268785b2
2 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/staging/greybus/connection.c
View File

@ -170,6 +170,7 @@ gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
connection->state = GB_CONNECTION_STATE_DISABLED;
atomic_set(&connection->op_cycle, 0);
mutex_init(&connection->mutex);
spin_lock_init(&connection->lock);
INIT_LIST_HEAD(&connection->operations);
@ -390,9 +391,14 @@ int gb_connection_enable(struct gb_connection *connection,
{
int ret;
mutex_lock(&connection->mutex);
if (connection->state == GB_CONNECTION_STATE_ENABLED)
goto out_unlock;
ret = gb_connection_hd_cport_enable(connection);
if (ret)
return ret;
goto err_unlock;
ret = gb_connection_svc_connection_create(connection);
if (ret)
@ -407,6 +413,9 @@ int gb_connection_enable(struct gb_connection *connection,
if (ret)
goto err_svc_destroy;
out_unlock:
mutex_unlock(&connection->mutex);
return 0;
err_svc_destroy:
@ -418,6 +427,8 @@ err_svc_destroy:
gb_connection_svc_connection_destroy(connection);
err_hd_cport_disable:
gb_connection_hd_cport_disable(connection);
err_unlock:
mutex_unlock(&connection->mutex);
return ret;
}
@ -425,8 +436,10 @@ EXPORT_SYMBOL_GPL(gb_connection_enable);
void gb_connection_disable(struct gb_connection *connection)
{
mutex_lock(&connection->mutex);
if (connection->state == GB_CONNECTION_STATE_DISABLED)
return;
goto out_unlock;
gb_connection_control_disconnected(connection);
@ -437,6 +450,9 @@ void gb_connection_disable(struct gb_connection *connection)
gb_connection_svc_connection_destroy(connection);
gb_connection_hd_cport_disable(connection);
out_unlock:
mutex_unlock(&connection->mutex);
}
EXPORT_SYMBOL_GPL(gb_connection_disable);

1
drivers/staging/greybus/connection.h
View File

@ -43,6 +43,7 @@ struct gb_connection {
u8 module_major;
u8 module_minor;
struct mutex mutex;
spinlock_t lock;
enum gb_connection_state state;
struct list_head operations;