[PATCH AUTOSEL 4.18 03/58] soundwire: Fix acquiring bus lock twice during master release

Sasha Levin
2018-10-08T15:25:34Z

From: Sanyog Kale <sanyog.r.kale@intel.com>

[ Upstream commit 8d6ccf5cebbc7ed1dee9986e36853a78dfb64084 ]

As part of sdw_stream_remove_master(), sdw_stream_remove_slave() is called
which results in bus lock being acquired twice.

So, fix it by performing specific Slave remove operations in
sdw_release_master_stream() instead of calling sdw_stream_remove_slave().

Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/soundwire/stream.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index b2682272503e..e5c7e1ef6318 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -899,9 +899,10 @@ static void sdw_release_master_stream(struct sdw_stream_runtime *stream)
struct sdw_master_runtime *m_rt = stream->m_rt;
struct sdw_slave_runtime *s_rt, *_s_rt;

- list_for_each_entry_safe(s_rt, _s_rt,
- &m_rt->slave_rt_list, m_rt_node)
- sdw_stream_remove_slave(s_rt->slave, stream);
+ list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
+ sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
+ sdw_release_slave_stream(s_rt->slave, stream);
+ }

list_del(&m_rt->bus_node);
}
--
2.17.1