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Commit f02f23f1 authored by Alan Kwong's avatar Alan Kwong Committed by Gerrit - the friendly Code Review server
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drm/msm/sde: add mode config mutex lock for connector search 



Connection enumeration is used by writeback device to find the
writeback connector. Using connector for_each macros requires
lock of mode config mutex.  Add mutex protection for writeback
connector enumeration.

Change-Id: Ib299f1576cb17d30543daa00df95924b51bc862f
Signed-off-by: default avatarAlan Kwong <akwong@codeaurora.org>
parent 4edc9e77

drivers/gpu/drm/msm/sde/sde_encoder_phys_wb.c

+10 −0
Original line number Diff line number Diff line
@@ -781,15 +781,25 @@ static void sde_encoder_phys_wb_enable(struct sde_encoder_phys *phys_enc) 
{

	struct sde_encoder_phys_wb *wb_enc = to_sde_encoder_phys_wb(phys_enc);

	struct sde_hw_wb *hw_wb = wb_enc->hw_wb;

	struct drm_device *dev;

	struct drm_connector *connector;



	SDE_DEBUG("[wb:%d]\n", hw_wb->idx - WB_0);



	if (!wb_enc->base.parent || !wb_enc->base.parent->dev) {

		SDE_ERROR("invalid drm device\n");

		return;

	}

	dev = wb_enc->base.parent->dev;



	/* find associated writeback connector */

	mutex_lock(&dev->mode_config.mutex);

	drm_for_each_connector(connector, phys_enc->parent->dev) {

		if (connector->encoder == phys_enc->parent)

			break;

	}

	mutex_unlock(&dev->mode_config.mutex);



	if (!connector || connector->encoder != phys_enc->parent) {

		SDE_ERROR("failed to find writeback connector\n");

		return;