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-rw-r--r--drivers/soundwire/stream.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 93baca08a0de..d77a8a0d42c8 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1150,7 +1150,8 @@ static struct sdw_master_runtime
*sdw_master_rt_alloc(struct sdw_bus *bus,
struct sdw_stream_runtime *stream)
{
- struct sdw_master_runtime *m_rt;
+ struct sdw_master_runtime *m_rt, *walk_m_rt;
+ struct list_head *insert_after;
m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
if (!m_rt)
@@ -1159,7 +1160,20 @@ static struct sdw_master_runtime
/* Initialization of Master runtime handle */
INIT_LIST_HEAD(&m_rt->port_list);
INIT_LIST_HEAD(&m_rt->slave_rt_list);
- list_add_tail(&m_rt->stream_node, &stream->master_list);
+
+ /*
+ * Add in order of bus id so that when taking the bus_lock
+ * of multiple buses they will always be taken in the same
+ * order to prevent a mutex deadlock.
+ */
+ insert_after = &stream->master_list;
+ list_for_each_entry_reverse(walk_m_rt, &stream->master_list, stream_node) {
+ if (walk_m_rt->bus->id < bus->id) {
+ insert_after = &walk_m_rt->stream_node;
+ break;
+ }
+ }
+ list_add(&m_rt->stream_node, insert_after);
list_add_tail(&m_rt->bus_node, &bus->m_rt_list);