From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
In the existing code we may read a negative error value but still mask
it and write it back.
Make sure all reads are tested and errors not propagated further.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@xxxxxxxxxxxxxxx>
Signed-off-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
drivers/soundwire/bus.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 04eb879de145..1c01cc192cbd 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -875,8 +875,12 @@ static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
if (wake_en)
val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
} else {
- val = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
-
+ ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
+ if (ret < 0) {
+ dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
+ return ret;
+ }
+ val = ret;
val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
}
@@ -895,8 +899,12 @@ static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
int val;
do {
- val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT) &
- SDW_SCP_STAT_CLK_STP_NF;
+ val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
+ if (val < 0) {
+ dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
+ return val;
+ }
+ val &= SDW_SCP_STAT_CLK_STP_NF;
if (!val) {
dev_info(bus->dev, "clock stop prep/de-prep done slave:%d",
dev_num);
--
2.17.1
