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authorJani Nikula <ext-jani.1.nikula@nokia.com>2010-04-28 11:15:18 +0300
committerTomi Valkeinen <tomi.valkeinen@nokia.com>2010-08-03 15:18:47 +0300
commit6b316715b4b96da49fcac0fa07082692eebca8af (patch)
tree0115f766399a859e5bdd831166b9ac7fa40c0467 /drivers/video/omap2
parent006db7b4304303f014a0c13f479715885b603e9f (diff)
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>
Diffstat (limited to 'drivers/video/omap2')
-rw-r--r--drivers/video/omap2/displays/panel-taal.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index 8fbb94e2bf5d..0eed3282a7a5 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -364,6 +364,8 @@ static ssize_t taal_num_errors_show(struct device *dev,
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 @@ static ssize_t taal_num_errors_show(struct device *dev,
r = -ENODEV;
}
+ mutex_unlock(&td->lock);
+
if (r)
return r;
@@ -386,6 +390,8 @@ static ssize_t taal_hw_revision_show(struct device *dev,
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 @@ static ssize_t taal_hw_revision_show(struct device *dev,
r = -ENODEV;
}
+ mutex_unlock(&td->lock);
+
if (r)
return r;
@@ -443,6 +451,8 @@ static ssize_t store_cabc_mode(struct device *dev,
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 @@ static ssize_t store_cabc_mode(struct device *dev,
td->cabc_mode = i;
+ mutex_unlock(&td->lock);
+
return count;
}