From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
The edid is protected by mode_config.mutex. Grab the lock when frobbing
the debugfs edid_override thing.
Cc: Keith Packard <keithp@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_debugfs.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index b2482818fee8..caac17145629 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -275,11 +275,17 @@ static ssize_t connector_write(struct file *file, const char __user *ubuf,
static int edid_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
- struct drm_property_blob *edid = connector->edid_blob_ptr;
+ struct drm_property_blob *edid;
+
+ mutex_lock(&connector->dev->mode_config.mutex);
+
+ edid = connector->edid_blob_ptr;
if (connector->override_edid && edid)
seq_write(m, edid->data, edid->length);
+ mutex_unlock(&connector->dev->mode_config.mutex);
+
return 0;
}
@@ -305,6 +311,8 @@ static ssize_t edid_write(struct file *file, const char __user *ubuf,
edid = (struct edid *) buf;
+ mutex_lock(&connector->dev->mode_config.mutex);
+
if (len == 5 && !strncmp(buf, "reset", 5)) {
connector->override_edid = false;
ret = drm_mode_connector_update_edid_property(connector, NULL);
@@ -318,6 +326,8 @@ static ssize_t edid_write(struct file *file, const char __user *ubuf,
connector->override_edid = true;
}
+ mutex_unlock(&connector->dev->mode_config.mutex);
+
kfree(buf);
return (ret) ? ret : len;
--
2.13.6
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