linux-kernel - [PATCH] clk: tegra: bpmp: Don't crash when a clock fails to register

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Message-ID: <20180629143814.17950-1-mperttunen@nvidia.com>
Date:   Fri, 29 Jun 2018 17:38:14 +0300
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     <pdeschrijver@...dia.com>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>
CC:     <linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <swarren@...dia.com>,
        <vbhadram@...dia.com>, Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] clk: tegra: bpmp: Don't crash when a clock fails to register

When registering clocks, we just skip any that fail to register
(leaving a NULL hole in the clock table). However, our of_xlate
function still tries to dereference each entry while looking for
the clock with the requested id, causing a crash if any clocks
failed to register. Add a check to of_xlate to skip any NULL
clocks.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/clk/tegra/clk-bpmp.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
index a896692b74ec..01dada561c10 100644
--- a/drivers/clk/tegra/clk-bpmp.c
+++ b/drivers/clk/tegra/clk-bpmp.c
@@ -586,9 +586,15 @@ static struct clk_hw *tegra_bpmp_clk_of_xlate(struct of_phandle_args *clkspec,
 	unsigned int id = clkspec->args[0], i;
 	struct tegra_bpmp *bpmp = data;
 
-	for (i = 0; i < bpmp->num_clocks; i++)
-		if (bpmp->clocks[i]->id == id)
-			return &bpmp->clocks[i]->hw;
+	for (i = 0; i < bpmp->num_clocks; i++) {
+		struct tegra_bpmp_clk *clk = bpmp->clocks[i];
+
+		if (!clk)
+			continue;
+
+		if (clk->id == id)
+			return &clk->hw;
+	}
 
 	return NULL;
 }
-- 
2.16.1