forked from Minki/linux
[S390] cio: Use locks when accessing /sys/firmware/cpi data.
Mutex locks are used to avoid problems when /sys/firmware/cpi data are accessed to in parallel. Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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@ -27,6 +27,8 @@
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#define CPI_LENGTH_NAME 8
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#define CPI_LENGTH_LEVEL 16
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static DEFINE_MUTEX(sclp_cpi_mutex);
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struct cpi_evbuf {
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struct evbuf_header header;
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u8 id_format;
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@ -223,7 +225,12 @@ static void set_string(char *attr, const char *value)
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static ssize_t system_name_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", system_name);
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int rc;
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mutex_lock(&sclp_cpi_mutex);
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rc = snprintf(page, PAGE_SIZE, "%s\n", system_name);
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mutex_unlock(&sclp_cpi_mutex);
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return rc;
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}
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static ssize_t system_name_store(struct kobject *kobj,
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@ -237,7 +244,9 @@ static ssize_t system_name_store(struct kobject *kobj,
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if (rc)
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return rc;
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mutex_lock(&sclp_cpi_mutex);
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set_string(system_name, buf);
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mutex_unlock(&sclp_cpi_mutex);
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return len;
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}
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@ -248,7 +257,12 @@ static struct kobj_attribute system_name_attr =
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static ssize_t sysplex_name_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", sysplex_name);
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int rc;
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mutex_lock(&sclp_cpi_mutex);
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rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name);
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mutex_unlock(&sclp_cpi_mutex);
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return rc;
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}
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static ssize_t sysplex_name_store(struct kobject *kobj,
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@ -262,7 +276,9 @@ static ssize_t sysplex_name_store(struct kobject *kobj,
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if (rc)
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return rc;
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mutex_lock(&sclp_cpi_mutex);
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set_string(sysplex_name, buf);
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mutex_unlock(&sclp_cpi_mutex);
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return len;
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}
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@ -273,7 +289,12 @@ static struct kobj_attribute sysplex_name_attr =
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static ssize_t system_type_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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return snprintf(page, PAGE_SIZE, "%s\n", system_type);
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int rc;
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mutex_lock(&sclp_cpi_mutex);
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rc = snprintf(page, PAGE_SIZE, "%s\n", system_type);
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mutex_unlock(&sclp_cpi_mutex);
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return rc;
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}
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static ssize_t system_type_store(struct kobject *kobj,
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@ -287,7 +308,9 @@ static ssize_t system_type_store(struct kobject *kobj,
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if (rc)
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return rc;
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mutex_lock(&sclp_cpi_mutex);
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set_string(system_type, buf);
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mutex_unlock(&sclp_cpi_mutex);
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return len;
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}
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@ -298,8 +321,11 @@ static struct kobj_attribute system_type_attr =
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static ssize_t system_level_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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unsigned long long level = system_level;
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unsigned long long level;
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mutex_lock(&sclp_cpi_mutex);
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level = system_level;
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mutex_unlock(&sclp_cpi_mutex);
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return snprintf(page, PAGE_SIZE, "%#018llx\n", level);
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}
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@ -320,8 +346,9 @@ static ssize_t system_level_store(struct kobject *kobj,
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if (*endp)
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return -EINVAL;
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mutex_lock(&sclp_cpi_mutex);
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system_level = level;
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mutex_unlock(&sclp_cpi_mutex);
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return len;
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}
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@ -334,7 +361,9 @@ static ssize_t set_store(struct kobject *kobj,
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{
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int rc;
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mutex_lock(&sclp_cpi_mutex);
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rc = cpi_req();
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mutex_unlock(&sclp_cpi_mutex);
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if (rc)
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return rc;
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@ -373,12 +402,16 @@ int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type,
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if (rc)
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return rc;
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mutex_lock(&sclp_cpi_mutex);
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set_string(system_name, system);
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set_string(sysplex_name, sysplex);
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set_string(system_type, type);
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system_level = level;
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return cpi_req();
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rc = cpi_req();
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mutex_unlock(&sclp_cpi_mutex);
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return rc;
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}
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EXPORT_SYMBOL(sclp_cpi_set_data);
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