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cpufreq: cpufreq-dt: avoid uninitialized variable warnings:

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gcc warns quite a bit about values returned from allocate_resources()
in cpufreq-dt.c:

cpufreq-dt.c: In function 'cpufreq_init':
cpufreq-dt.c:327:6: error: 'cpu_dev' may be used uninitialized in this function [-Werror=maybe-uninitialized]
cpufreq-dt.c:197:17: note: 'cpu_dev' was declared here
cpufreq-dt.c:376:2: error: 'cpu_clk' may be used uninitialized in this function [-Werror=maybe-uninitialized]
cpufreq-dt.c:199:14: note: 'cpu_clk' was declared here
cpufreq-dt.c: In function 'dt_cpufreq_probe':
cpufreq-dt.c:461:2: error: 'cpu_clk' may be used uninitialized in this function [-Werror=maybe-uninitialized]
cpufreq-dt.c:447:14: note: 'cpu_clk' was declared here

The problem is that it's slightly hard for gcc to follow return
codes across PTR_ERR() calls.

This patch uses explicit assignments to the "ret" variable to make
it easier for gcc to verify that the code is actually correct,
without the need to add a bogus initialization.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit b331bc20d9)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
This commit is contained in:
Arnd Bergmann
2016-01-25 16:45:48 +01:00
committed by Alex Shi
parent 59dfbb981e
commit 5b9202b77c
1 changed files with 7 additions and 8 deletions
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15
drivers/cpufreq/cpufreq-dt.c
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@@ -141,15 +141,16 @@ static int allocate_resources(int cpu, struct device **cdev,
try_again:
cpu_reg = regulator_get_optional(cpu_dev, reg);
if (IS_ERR(cpu_reg)) {
ret = PTR_ERR_OR_ZERO(cpu_reg);
if (ret) {
/*
* If cpu's regulator supply node is present, but regulator is
* not yet registered, we should try defering probe.
*/
if (PTR_ERR(cpu_reg) == -EPROBE_DEFER) {
if (ret == -EPROBE_DEFER) {
dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n",
cpu);
return -EPROBE_DEFER;
return ret;
}
/* Try with "cpu-supply" */
@@ -158,18 +159,16 @@ try_again:
goto try_again;
}
dev_dbg(cpu_dev, "no regulator for cpu%d: %ld\n",
cpu, PTR_ERR(cpu_reg));
dev_dbg(cpu_dev, "no regulator for cpu%d: %d\n", cpu, ret);
}
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
ret = PTR_ERR_OR_ZERO(cpu_clk);
if (ret) {
/* put regulator */
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
ret = PTR_ERR(cpu_clk);
/*
* If cpu's clk node is present, but clock is not yet
* registered, we should try defering probe.