[PATCH 2/4] drm/i915: Protect force_bit with gmbus_mutex

ville.syrjala
2016-03-07T15:57:10Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Extend the protection of gmbus_mutex around the force_bit
RMW in intel_gmbus_force_bit(), in case someone gets the
idea of calling it from a separate thread while there's
other stuff happening on the same bus.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_i2c.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 52fbe530fc9e..7bf8a485e18f 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -718,11 +718,16 @@ void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed)
void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit)
{
struct intel_gmbus *bus = to_intel_gmbus(adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ mutex_lock(&dev_priv->gmbus_mutex);

bus->force_bit += force_bit ? 1 : -1;
DRM_DEBUG_KMS("%sabling bit-banging on %s. force bit now %d\n",
force_bit ? "en" : "dis", adapter->name,
bus->force_bit);
+
+ mutex_unlock(&dev_priv->gmbus_mutex);
}

void intel_teardown_gmbus(struct drm_device *dev)
--
2.4.10