1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index a0c8965c1a79..530a2d309063 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/drivers/w1/masters/ds1wm.c
@@ -334,7 +334,9 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
                         return;
                 }
 
+                mutex_lock(&master_dev->bus_mutex);
                 if (ds1wm_reset(ds1wm_data)) {
+                        mutex_unlock(&master_dev->bus_mutex);
                         dev_dbg(&ds1wm_data->pdev->dev,
                                 "pass: %d reset error (or no slaves)\n", pass);
                         break;
@@ -387,6 +389,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
 
                 }
                 if (ds1wm_data->read_error) {
+                        mutex_unlock(&master_dev->bus_mutex);
                         dev_err(&ds1wm_data->pdev->dev,
                                 "pass: %d read error, retrying\n", pass);
                         break;
@@ -400,6 +403,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev,
                 dev_dbg(&ds1wm_data->pdev->dev,
                         "pass: %d resetting bus\n", pass);
                 ds1wm_reset(ds1wm_data);
+                mutex_unlock(&master_dev->bus_mutex);
                 if ((r_prime & ((u64)1 << 63)) && (d & ((u64)1 << 63))) {
                         dev_err(&ds1wm_data->pdev->dev,
                                 "pass: %d bus error, retrying\n", pass);