[PATCH 1/3] drm/msm: dsi: Initialize msm_dsi->id to -1

[Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>]

Currently msm_dsi->id is initialized to 0 during kzalloc. If bind fails
for a secondary dsi device before its id can be properly set (such as
during dt parsing), the id will point to the primary dsi device, causing
its reference to be removed from dsi_manager's global (msm_dsim_glb)
array.

This patch initializes the id to -1 and checks for negative in the
manager cleanup.

Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/dsi/dsi.c         | 1 +
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index ff8164cc6738..ee07d58c2d97 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -83,6 +83,7 @@ static struct msm_dsi *dsi_init(struct platform_device *pdev)
 		return ERR_PTR(-ENOMEM);
 	DBG("dsi probed=%p", msm_dsi);
 
+	msm_dsi->id = -1;
 	msm_dsi->pdev = pdev;
 	platform_set_drvdata(pdev, msm_dsi);
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 5224010d90e4..80aa6344185e 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -839,6 +839,8 @@ void msm_dsi_manager_unregister(struct msm_dsi *msm_dsi)
 
 	if (msm_dsi->host)
 		msm_dsi_host_unregister(msm_dsi->host);
-	msm_dsim->dsi[msm_dsi->id] = NULL;
+
+	if (msm_dsi->id >= 0)
+		msm_dsim->dsi[msm_dsi->id] = NULL;
 }
 
-- 
Sean Paul, Software Engineer, Google / Chromium OS

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