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

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Message-Id: <1595247476-12968-1-git-send-email-rnayak@codeaurora.org>
Date:   Mon, 20 Jul 2020 17:47:56 +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/dpu: dev_pm_opp_put_clkname() only when an opp_table exists

Its possible that dpu_bind() fails early enough before
dev_pm_opp_set_clkname() is called. In such cases, unconditionally
calling dev_pm_opp_put_clkname() in dpu_unbind() can result in
a crash. Put an additional check so that dev_pm_opp_put_clkname()
is called only when an opp_table exists.

Fixes: aa3950767d05 ("drm/msm/dpu: Use OPP API to set clk/perf state")
Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index f2bbce4..843a1c1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1079,7 +1079,8 @@ static void dpu_unbind(struct device *dev, struct device *master, void *data)
 
 	if (dpu_kms->has_opp_table)
 		dev_pm_opp_of_remove_table(dev);
-	dev_pm_opp_put_clkname(dpu_kms->opp_table);
+	if (dpu_kms->opp_table)
+		dev_pm_opp_put_clkname(dpu_kms->opp_table);
 }
 
 static const struct component_ops dpu_ops = {
-- 
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