From: Chao Song chao.song@linux.intel.com

If there is no slave attached to soundwire bus, we can return earlier from sdw_bus_prep_clk_stop() and sdw_bus_exit_clk_stop(), this saves a redundant value check.

Signed-off-by: Chao Song chao.song@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com --- drivers/soundwire/bus.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 82df088c9333..d9deafdcf495 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -951,17 +951,17 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) simple_clk_stop = false; }

- if (is_slave && !simple_clk_stop) { + /* Skip remaining clock stop preparation if no Slave is attached */ + if (!is_slave) + return ret; + + if (!simple_clk_stop) { ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); if (ret < 0) return ret; }

- /* Don't need to inform slaves if there is no slave attached */ - if (!is_slave) - return ret; - /* Inform slaves that prep is done */ list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) @@ -1075,16 +1075,13 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) "clk stop deprep failed:%d", ret); }

- if (is_slave && !simple_clk_stop) + /* Skip remaining clock stop de-preparation if no Slave is attached */ + if (!is_slave) + return 0; + + if (!simple_clk_stop) sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);

- /* - * Don't need to call slave callback function if there is no slave - * attached - */ - if (!is_slave) - return 0; - list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) continue;