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| author | viresh kumar <viresh.kumar@linaro.org> | 2012-10-23 01:23:43 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2012-11-15 00:33:06 +0100 |
| commit | 4b972f0b04eaae645b22d99479b9aea43c3d64e7 (patch) | |
| tree | ab9fd0b4ebe200738bb6836fa2e27c8db56352b2 | |
| parent | 8bf1ac723639c4260f76df0e45ee23aa35a23067 (diff) | |
| download | linux-4b972f0b04eaae645b22d99479b9aea43c3d64e7.tar.bz2 | |
cpufreq / core: Fix printing of governor and driver name
Arrays for governer and driver name are of size CPUFREQ_NAME_LEN or 16.
i.e. 15 bytes for name and 1 for trailing '\0'.
When cpufreq driver print these names (for sysfs), it includes '\n' or ' ' in
the fmt string and still passes length as CPUFREQ_NAME_LEN. If the driver or
governor names are using all 15 fields allocated to them, then the trailing '\n'
or ' ' will never be printed. And so commands like:
root@linaro-developer# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
will print something like:
cpufreq_foodrvroot@linaro-developer#
Fix this by increasing print length by one character.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 6 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 021973b7dc56..db6e337ad337 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -445,7 +445,7 @@ static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) return sprintf(buf, "performance\n"); else if (policy->governor) - return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", + return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", policy->governor->name); return -EINVAL; } @@ -491,7 +491,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, */ static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) { - return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name); + return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); } /** @@ -512,7 +512,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2))) goto out; - i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name); + i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); } out: i += sprintf(&buf[i], "\n"); diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index b60f6ba01d0c..fc4b78510151 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -22,6 +22,8 @@ #include <asm/div64.h> #define CPUFREQ_NAME_LEN 16 +/* Print length for names. Extra 1 space for accomodating '\n' in prints */ +#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) /********************************************************************* |