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path: root/drivers/fsi/fsi-core.c
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Diffstat (limited to 'drivers/fsi/fsi-core.c')
-rw-r--r--drivers/fsi/fsi-core.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index dea5bd48acc5..2c31563fdcae 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1203,8 +1203,14 @@ static void fsi_master_unscan(struct fsi_master *master)
int fsi_master_rescan(struct fsi_master *master)
{
+ int rc;
+
+ mutex_lock(&master->scan_lock);
fsi_master_unscan(master);
- return fsi_master_scan(master);
+ rc = fsi_master_scan(master);
+ mutex_unlock(&master->scan_lock);
+
+ return rc;
}
EXPORT_SYMBOL_GPL(fsi_master_rescan);
@@ -1240,6 +1246,7 @@ int fsi_master_register(struct fsi_master *master)
int rc;
struct device_node *np;
+ mutex_init(&master->scan_lock);
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
dev_set_name(&master->dev, "fsi%d", master->idx);
@@ -1264,8 +1271,11 @@ int fsi_master_register(struct fsi_master *master)
}
np = dev_of_node(&master->dev);
- if (!of_property_read_bool(np, "no-scan-on-init"))
+ if (!of_property_read_bool(np, "no-scan-on-init")) {
+ mutex_lock(&master->scan_lock);
fsi_master_scan(master);
+ mutex_unlock(&master->scan_lock);
+ }
return 0;
}
@@ -1278,7 +1288,9 @@ void fsi_master_unregister(struct fsi_master *master)
master->idx = -1;
}
+ mutex_lock(&master->scan_lock);
fsi_master_unscan(master);
+ mutex_unlock(&master->scan_lock);
device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(fsi_master_unregister);