linux-kernel - [PATCH] drm/msm: dsi: dev_pm_opp_put_clkname() only when an opp

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Message-Id: <1595246509-6584-1-git-send-email-rnayak@codeaurora.org>
Date:   Mon, 20 Jul 2020 17:31:49 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     robdclark@...il.com, sean@...rly.run
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH] drm/msm: dsi: dev_pm_opp_put_clkname() only when an opp_table exists

Its possible for msm_dsi_host_init() to fail early, before
dev_pm_opp_set_clkname() is called. In such cases, unconditionally
calling dev_pm_opp_put_clkname() in msm_dsi_host_destroy() results
in a crash. Put an additional check so that dev_pm_opp_put_clkname()
is called only when an opp_table exists.

Fixes: f99131fa7a23 ("drm/msm: dsi: Use OPP API to set clk/perf state")
Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 0a14c4a..4f580f7 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1936,7 +1936,8 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
 
 	if (msm_host->has_opp_table)
 		dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
-	dev_pm_opp_put_clkname(msm_host->opp_table);
+	if (msm_host->opp_table)
+		dev_pm_opp_put_clkname(msm_host->opp_table);
 	pm_runtime_disable(&msm_host->pdev->dev);
 }
 
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