| Message ID | 20240619081520.259971-1-perry.yuan@amd.com |
|---|---|
| State | New |
| Headers | show |
| Series | cpufreq: update to sysfs_emit for safer buffer handling | expand |
On 6/19/2024 03:15, Perry Yuan wrote: > Replaced sprintf and scnprintf with sysfs_emit and sysfs_emit_at in the > cpufreq driver. This ensures safer buffer handling and consistency with > sysfs interfaces. Updated show_scaling_available_governors and related > functions for compliance with the new API. > > Signed-off-by: Perry Yuan <perry.yuan@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> > --- > drivers/cpufreq/cpufreq.c | 37 ++++++++++++++++++------------------- > 1 file changed, 18 insertions(+), 19 deletions(-) > > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c > index e1a4730f4f8c..e76d8e2b4c87 100644 > --- a/drivers/cpufreq/cpufreq.c > +++ b/drivers/cpufreq/cpufreq.c > @@ -608,7 +608,7 @@ EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us); > static ssize_t show_boost(struct kobject *kobj, > struct kobj_attribute *attr, char *buf) > { > - return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); > + return sysfs_emit(buf, "%d\n", cpufreq_driver->boost_enabled); > } > > static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr, > @@ -738,7 +738,7 @@ static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor) > static ssize_t show_##file_name \ > (struct cpufreq_policy *policy, char *buf) \ > { \ > - return sprintf(buf, "%u\n", policy->object); \ > + return sysfs_emit(buf, "%u\n", policy->object); \ > } > > show_one(cpuinfo_min_freq, cpuinfo.min_freq); > @@ -759,11 +759,11 @@ static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) > > freq = arch_freq_get_on_cpu(policy->cpu); > if (freq) > - ret = sprintf(buf, "%u\n", freq); > + ret = sysfs_emit(buf, "%u\n", freq); > else if (cpufreq_driver->setpolicy && cpufreq_driver->get) > - ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); > + ret = sysfs_emit(buf, "%u\n", cpufreq_driver->get(policy->cpu)); > else > - ret = sprintf(buf, "%u\n", policy->cur); > + ret = sysfs_emit(buf, "%u\n", policy->cur); > return ret; > } > > @@ -797,9 +797,9 @@ static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, > unsigned int cur_freq = __cpufreq_get(policy); > > if (cur_freq) > - return sprintf(buf, "%u\n", cur_freq); > + return sysfs_emit(buf, "%u\n", cur_freq); > > - return sprintf(buf, "<unknown>\n"); > + return sysfs_emit(buf, "<unknown>\n"); > } > > /* > @@ -808,12 +808,11 @@ static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, > static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) > { > if (policy->policy == CPUFREQ_POLICY_POWERSAVE) > - return sprintf(buf, "powersave\n"); > + return sysfs_emit(buf, "powersave\n"); > else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) > - return sprintf(buf, "performance\n"); > + return sysfs_emit(buf, "performance\n"); > else if (policy->governor) > - return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", > - policy->governor->name); > + return sysfs_emit(buf, "%s\n", policy->governor->name); > return -EINVAL; > } > > @@ -872,7 +871,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, > struct cpufreq_governor *t; > > if (!has_target()) { > - i += sprintf(buf, "performance powersave"); > + i += sysfs_emit(buf, "performance powersave"); > goto out; > } > > @@ -881,11 +880,11 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, > if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) > - (CPUFREQ_NAME_LEN + 2))) > break; > - i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); > + i += sysfs_emit_at(buf, i, "%s ", t->name); > } > mutex_unlock(&cpufreq_governor_mutex); > out: > - i += sprintf(&buf[i], "\n"); > + i += sysfs_emit_at(buf, i, "\n"); > return i; > } > > @@ -895,7 +894,7 @@ ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) > unsigned int cpu; > > for_each_cpu(cpu, mask) { > - i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u ", cpu); > + i += sysfs_emit_at(buf, i, "%u ", cpu); > if (i >= (PAGE_SIZE - 5)) > break; > } > @@ -903,7 +902,7 @@ ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) > /* Remove the extra space at the end */ > i--; > > - i += sprintf(&buf[i], "\n"); > + i += sysfs_emit_at(buf, i, "\n"); > return i; > } > EXPORT_SYMBOL_GPL(cpufreq_show_cpus); > @@ -946,7 +945,7 @@ static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, > static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) > { > if (!policy->governor || !policy->governor->show_setspeed) > - return sprintf(buf, "<unsupported>\n"); > + return sysfs_emit(buf, "<unsupported>\n"); > > return policy->governor->show_setspeed(policy, buf); > } > @@ -960,8 +959,8 @@ static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) > int ret; > ret = cpufreq_driver->bios_limit(policy->cpu, &limit); > if (!ret) > - return sprintf(buf, "%u\n", limit); > - return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); > + return sysfs_emit(buf, "%u\n", limit); > + return sysfs_emit(buf, "%u\n", policy->cpuinfo.max_freq); > } > > cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index e1a4730f4f8c..e76d8e2b4c87 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -608,7 +608,7 @@ EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us); static ssize_t show_boost(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); + return sysfs_emit(buf, "%d\n", cpufreq_driver->boost_enabled); } static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr, @@ -738,7 +738,7 @@ static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor) static ssize_t show_##file_name \ (struct cpufreq_policy *policy, char *buf) \ { \ - return sprintf(buf, "%u\n", policy->object); \ + return sysfs_emit(buf, "%u\n", policy->object); \ } show_one(cpuinfo_min_freq, cpuinfo.min_freq); @@ -759,11 +759,11 @@ static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) freq = arch_freq_get_on_cpu(policy->cpu); if (freq) - ret = sprintf(buf, "%u\n", freq); + ret = sysfs_emit(buf, "%u\n", freq); else if (cpufreq_driver->setpolicy && cpufreq_driver->get) - ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); + ret = sysfs_emit(buf, "%u\n", cpufreq_driver->get(policy->cpu)); else - ret = sprintf(buf, "%u\n", policy->cur); + ret = sysfs_emit(buf, "%u\n", policy->cur); return ret; } @@ -797,9 +797,9 @@ static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, unsigned int cur_freq = __cpufreq_get(policy); if (cur_freq) - return sprintf(buf, "%u\n", cur_freq); + return sysfs_emit(buf, "%u\n", cur_freq); - return sprintf(buf, "<unknown>\n"); + return sysfs_emit(buf, "<unknown>\n"); } /* @@ -808,12 +808,11 @@ static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) { if (policy->policy == CPUFREQ_POLICY_POWERSAVE) - return sprintf(buf, "powersave\n"); + return sysfs_emit(buf, "powersave\n"); else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) - return sprintf(buf, "performance\n"); + return sysfs_emit(buf, "performance\n"); else if (policy->governor) - return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", - policy->governor->name); + return sysfs_emit(buf, "%s\n", policy->governor->name); return -EINVAL; } @@ -872,7 +871,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, struct cpufreq_governor *t; if (!has_target()) { - i += sprintf(buf, "performance powersave"); + i += sysfs_emit(buf, "performance powersave"); goto out; } @@ -881,11 +880,11 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2))) break; - i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); + i += sysfs_emit_at(buf, i, "%s ", t->name); } mutex_unlock(&cpufreq_governor_mutex); out: - i += sprintf(&buf[i], "\n"); + i += sysfs_emit_at(buf, i, "\n"); return i; } @@ -895,7 +894,7 @@ ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) unsigned int cpu; for_each_cpu(cpu, mask) { - i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u ", cpu); + i += sysfs_emit_at(buf, i, "%u ", cpu); if (i >= (PAGE_SIZE - 5)) break; } @@ -903,7 +902,7 @@ ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) /* Remove the extra space at the end */ i--; - i += sprintf(&buf[i], "\n"); + i += sysfs_emit_at(buf, i, "\n"); return i; } EXPORT_SYMBOL_GPL(cpufreq_show_cpus); @@ -946,7 +945,7 @@ static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) { if (!policy->governor || !policy->governor->show_setspeed) - return sprintf(buf, "<unsupported>\n"); + return sysfs_emit(buf, "<unsupported>\n"); return policy->governor->show_setspeed(policy, buf); } @@ -960,8 +959,8 @@ static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) int ret; ret = cpufreq_driver->bios_limit(policy->cpu, &limit); if (!ret) - return sprintf(buf, "%u\n", limit); - return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); + return sysfs_emit(buf, "%u\n", limit); + return sysfs_emit(buf, "%u\n", policy->cpuinfo.max_freq); } cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);
Replaced sprintf and scnprintf with sysfs_emit and sysfs_emit_at in the cpufreq driver. This ensures safer buffer handling and consistency with sysfs interfaces. Updated show_scaling_available_governors and related functions for compliance with the new API. Signed-off-by: Perry Yuan <perry.yuan@amd.com> --- drivers/cpufreq/cpufreq.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-)