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@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
index a896692..01dada5 100644 (file)
--- 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;
 }