OMAP: DSS2: Taal: Add locks to protect taal data access
Avoid potential race conditions in sysfs access to taal data.
Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index 8fbb94e..0eed328 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -364,6 +364,8 @@
u8 errors;
int r;
+ mutex_lock(&td->lock);
+
if (td->enabled) {
dsi_bus_lock();
r = taal_dcs_read_1(DCS_READ_NUM_ERRORS, &errors);
@@ -372,6 +374,8 @@
r = -ENODEV;
}
+ mutex_unlock(&td->lock);
+
if (r)
return r;
@@ -386,6 +390,8 @@
u8 id1, id2, id3;
int r;
+ mutex_lock(&td->lock);
+
if (td->enabled) {
dsi_bus_lock();
r = taal_get_id(&id1, &id2, &id3);
@@ -394,6 +400,8 @@
r = -ENODEV;
}
+ mutex_unlock(&td->lock);
+
if (r)
return r;
@@ -443,6 +451,8 @@
if (i == ARRAY_SIZE(cabc_modes))
return -EINVAL;
+ mutex_lock(&td->lock);
+
if (td->enabled) {
dsi_bus_lock();
if (!td->cabc_broken)
@@ -452,6 +462,8 @@
td->cabc_mode = i;
+ mutex_unlock(&td->lock);
+
return count;
}