From f0efc831d9439589efaf6406695470eca93ba08d Mon Sep 17 00:00:00 2001 From: Lloyd Atkinson Date: Tue, 16 Jan 2018 16:26:01 -0500 Subject: [PATCH] drm/msm/dsi: check for failure on retrieving pll in dsi manager Make msm_dsi_pll_init consistently return an error code instead of NULL when pll initialization fails so that later pll retrieval can check against an error code. Add checks for these failures after retrieval of src_pll to avoid invalid pointer dereferences later in msm_dsi_pll_get_clk_provider. Signed-off-by: Lloyd Atkinson Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/dsi/dsi_manager.c | 4 ++++ drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 6 +++--- drivers/gpu/drm/msm/dsi/pll/dsi_pll.c | 2 +- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c index 855248132b2b..1a54fd67c9c4 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c @@ -88,6 +88,8 @@ static int dsi_mgr_setup_components(int id) msm_dsi_phy_set_usecase(msm_dsi->phy, MSM_DSI_PHY_STANDALONE); src_pll = msm_dsi_phy_get_pll(msm_dsi->phy); + if (IS_ERR(src_pll)) + return PTR_ERR(src_pll); ret = msm_dsi_host_set_src_pll(msm_dsi->host, src_pll); } else if (!other_dsi) { ret = 0; @@ -116,6 +118,8 @@ static int dsi_mgr_setup_components(int id) msm_dsi_phy_set_usecase(clk_slave_dsi->phy, MSM_DSI_PHY_SLAVE); src_pll = msm_dsi_phy_get_pll(clk_master_dsi->phy); + if (IS_ERR(src_pll)) + return PTR_ERR(src_pll); ret = msm_dsi_host_set_src_pll(msm_dsi->host, src_pll); if (ret) return ret; diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c index 790ca280cbfd..c8bfaa780651 100644 --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c @@ -503,10 +503,10 @@ static int dsi_phy_driver_probe(struct platform_device *pdev) goto fail; phy->pll = msm_dsi_pll_init(pdev, phy->cfg->type, phy->id); - if (!phy->pll) + if (IS_ERR_OR_NULL(phy->pll)) dev_info(dev, - "%s: pll init failed, need separate pll clk driver\n", - __func__); + "%s: pll init failed: %ld, need separate pll clk driver\n", + __func__, PTR_ERR(phy->pll)); dsi_phy_disable_resource(phy); diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c index bc289f5c9078..491f08dce969 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c @@ -173,7 +173,7 @@ struct msm_dsi_pll *msm_dsi_pll_init(struct platform_device *pdev, if (IS_ERR(pll)) { dev_err(dev, "%s: failed to init DSI PLL\n", __func__); - return NULL; + return pll; } pll->type = type;