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drivers/perf: arm_pmu: avoid NULL dereference when not using devicetree 

Commit c6b90653f1 ("drivers/perf: arm_pmu: make info messages more
verbose") breaks booting on systems where the PMU is probed without
devicetree (e.g by inspecting the MIDR of the current CPU). In this case,
pdev->dev.of_node is NULL and we shouldn't try to access its ->fullname
field when printing probe error messages.

This patch fixes the probing code to use of_node_full_name, which safely
handles NULL nodes and removes the "Error %i" part of the string, since
it's not terribly useful.

Reported-by: Guenter Roeck <private@roeck-us.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2016-03-21 11:07:15 +00:00
parent fe638401a0
commit 357b565d5d
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/perf/arm_pmu.c
View File

@ -1002,8 +1002,7 @@ int arm_pmu_device_probe(struct platform_device *pdev,
}
if (ret) {
pr_info("%s: failed to probe PMU! Error %i\n",
node->full_name, ret);
pr_info("%s: failed to probe PMU!\n", of_node_full_name(node));
goto out_free;
}
@ -1023,8 +1022,8 @@ int arm_pmu_device_probe(struct platform_device *pdev,
out_destroy:
cpu_pmu_destroy(pmu);
out_free:
pr_info("%s: failed to register PMU devices! Error %i\n",
node->full_name, ret);
pr_info("%s: failed to register PMU devices!\n",
of_node_full_name(node));
kfree(pmu);
return ret;
}