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Date:   Sun, 26 Feb 2017 13:10:57 +0100
From:   Christophe JAILLET <>
        Christophe JAILLET <>
Subject: [PATCH v2] drm/msm/dsi: Fix the releasing of resources in error path in 'dsi_bus_clk_enable()'

If a 'clk_prepare_enable()' fails, then we need to disable_unprepare the
clk already handled.

With the current implemenatation, we try to do that on the clk that has
triggered the error, which is a no-op and leave msm_host->bus_clks[0]

Count forward in order to fix it and be more future proof.

Signed-off-by: Christophe JAILLET <>
v2: change the for loop from a backward to a forward one, to ease reading.
 drivers/gpu/drm/msm/dsi/dsi_host.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 1fc07ce24686..e6f56cd8ce08 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -422,7 +422,7 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
 static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
 	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
-	int i, ret;
+	int i, j, ret;
 	DBG("id=%d", msm_host->id);
@@ -437,8 +437,8 @@ static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
 	return 0;
-	for (; i > 0; i--)
-		clk_disable_unprepare(msm_host->bus_clks[i]);
+	for (j = 0; j < i; j++)
+		clk_disable_unprepare(msm_host->bus_clks[j]);
 	return ret;

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