[PATCH 4.14.y] drivers core: Use sysfs_emit and sysfs_emit_at for show(device *...) functions

From: Harshit Mogalapalli
Date: Fri Sep 22 2023 - 08:15:16 EST

From: Joe Perches <joe@xxxxxxxxxxx>

commit aa838896d87af561a33ecefea1caa4c15a68bc47 upstream.

Convert the various sprintf fmaily calls in sysfs device show functions
to sysfs_emit and sysfs_emit_at for PAGE_SIZE buffer safety.

Done with:

$ spatch -sp-file sysfs_emit_dev.cocci --in-place --max-width=80 .

And cocci script:

$ cat sysfs_emit_dev.cocci
@@
identifier d_show;
identifier dev, attr, buf;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
}

@@
identifier d_show;
identifier dev, attr, buf;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}

@@
identifier d_show;
identifier dev, attr, buf;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
}

@@
identifier d_show;
identifier dev, attr, buf;
expression chr;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- strcpy(buf, chr);
+ sysfs_emit(buf, chr);
...>
}

@@
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- sprintf(buf,
+ sysfs_emit(buf,
...);
...>
return len;
}

@@
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- snprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}

@@
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
len =
- scnprintf(buf, PAGE_SIZE,
+ sysfs_emit(buf,
...);
...>
return len;
}

@@
identifier d_show;
identifier dev, attr, buf;
identifier len;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
- len += scnprintf(buf + len, PAGE_SIZE - len,
+ len += sysfs_emit_at(buf, len,
...);
...>
return len;
}

@@
identifier d_show;
identifier dev, attr, buf;
expression chr;
@@

ssize_t d_show(struct device *dev, struct device_attribute *attr, char *buf)
{
...
- strcpy(buf, chr);
- return strlen(buf);
+ return sysfs_emit(buf, chr);
}

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/3d033c33056d88bbe34d4ddb62afd05ee166ab9a.1600285923.git.joe@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[Harshit: backport to 4.14.y -- regenerated the diff with the help of
coccinelle script in driver/base/ directory.]
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
---
Only compile tested. This fixes CVE-2022-20166.
It is not clear whether the CVE was assigned for a demonstrated issue
or just a theoretical one. In any case it's a good defensive measure
against future patches that may introduce a real issue if they assume
this patch is already there.
---
drivers/base/arch_topology.c | 3 +-
drivers/base/cacheinfo.c | 18 ++++++------
drivers/base/core.c | 8 ++---
drivers/base/cpu.c | 26 ++++++++---------
drivers/base/firmware_class.c | 2 +-
drivers/base/memory.c | 24 +++++++--------
drivers/base/node.c | 26 ++++++++---------
drivers/base/platform.c | 2 +-
drivers/base/power/sysfs.c | 55 ++++++++++++++++++-----------------
drivers/base/soc.c | 8 ++---
10 files changed, 87 insertions(+), 85 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 3da53cc6cf2b..4b965f562d0b 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -41,7 +41,8 @@ static ssize_t cpu_capacity_show(struct device *dev,
{
struct cpu *cpu = container_of(dev, struct cpu, dev);

- return sprintf(buf, "%lu\n", topology_get_cpu_scale(NULL, cpu->dev.id));
+ return sysfs_emit(buf, "%lu\n",
+ topology_get_cpu_scale(NULL, cpu->dev.id));
}

static ssize_t cpu_capacity_store(struct device *dev,
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index e405ea3ca8d8..1d4969b0478f 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -388,7 +388,7 @@ static ssize_t size_show(struct device *dev,
{
struct cacheinfo *this_leaf = dev_get_drvdata(dev);

- return sprintf(buf, "%uK\n", this_leaf->size >> 10);
+ return sysfs_emit(buf, "%uK\n", this_leaf->size >> 10);
}

static ssize_t shared_cpumap_show_func(struct device *dev, bool list, char *buf)
@@ -418,11 +418,11 @@ static ssize_t type_show(struct device *dev,

switch (this_leaf->type) {
case CACHE_TYPE_DATA:
- return sprintf(buf, "Data\n");
+ return sysfs_emit(buf, "Data\n");
case CACHE_TYPE_INST:
- return sprintf(buf, "Instruction\n");
+ return sysfs_emit(buf, "Instruction\n");
case CACHE_TYPE_UNIFIED:
- return sprintf(buf, "Unified\n");
+ return sysfs_emit(buf, "Unified\n");
default:
return -EINVAL;
}
@@ -436,11 +436,11 @@ static ssize_t allocation_policy_show(struct device *dev,
int n = 0;

if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE))
- n = sprintf(buf, "ReadWriteAllocate\n");
+ n = sysfs_emit(buf, "ReadWriteAllocate\n");
else if (ci_attr & CACHE_READ_ALLOCATE)
- n = sprintf(buf, "ReadAllocate\n");
+ n = sysfs_emit(buf, "ReadAllocate\n");
else if (ci_attr & CACHE_WRITE_ALLOCATE)
- n = sprintf(buf, "WriteAllocate\n");
+ n = sysfs_emit(buf, "WriteAllocate\n");
return n;
}

@@ -452,9 +452,9 @@ static ssize_t write_policy_show(struct device *dev,
int n = 0;

if (ci_attr & CACHE_WRITE_THROUGH)
- n = sprintf(buf, "WriteThrough\n");
+ n = sysfs_emit(buf, "WriteThrough\n");
else if (ci_attr & CACHE_WRITE_BACK)
- n = sprintf(buf, "WriteBack\n");
+ n = sysfs_emit(buf, "WriteBack\n");
return n;
}

diff --git a/drivers/base/core.c b/drivers/base/core.c
index e834087448a4..4f30ab4c3d95 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -766,7 +766,7 @@ ssize_t device_show_ulong(struct device *dev,
char *buf)
{
struct dev_ext_attribute *ea = to_ext_attr(attr);
- return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
+ return sysfs_emit(buf, "%lx\n", *(unsigned long *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_ulong);

@@ -791,7 +791,7 @@ ssize_t device_show_int(struct device *dev,
{
struct dev_ext_attribute *ea = to_ext_attr(attr);

- return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
+ return sysfs_emit(buf, "%d\n", *(int *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_int);

@@ -812,7 +812,7 @@ ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
{
struct dev_ext_attribute *ea = to_ext_attr(attr);

- return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var));
+ return sysfs_emit(buf, "%d\n", *(bool *)(ea->var));
}
EXPORT_SYMBOL_GPL(device_show_bool);

@@ -1036,7 +1036,7 @@ static ssize_t online_show(struct device *dev, struct device_attribute *attr,
device_lock(dev);
val = !dev->offline;
device_unlock(dev);
- return sprintf(buf, "%u\n", val);
+ return sysfs_emit(buf, "%u\n", val);
}

static ssize_t online_store(struct device *dev, struct device_attribute *attr,
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index c9463c30b812..f602b2215026 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -154,7 +154,7 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
* operation should be safe. No locking required.
*/
addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
- rc = sprintf(buf, "%Lx\n", addr);
+ rc = sysfs_emit(buf, "%Lx\n", addr);
return rc;
}
static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
@@ -165,7 +165,7 @@ static ssize_t show_crash_notes_size(struct device *dev,
{
ssize_t rc;

- rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
+ rc = sysfs_emit(buf, "%zu\n", sizeof(note_buf_t));
return rc;
}
static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
@@ -318,8 +318,8 @@ static ssize_t print_cpu_modalias(struct device *dev,
ssize_t n;
u32 i;

- n = sprintf(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:",
- CPU_FEATURE_TYPEVAL);
+ n = sysfs_emit(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:",
+ CPU_FEATURE_TYPEVAL);

for (i = 0; i < MAX_CPU_FEATURES; i++)
if (cpu_have_feature(i)) {
@@ -506,56 +506,56 @@ static void __init cpu_dev_register_generic(void)
ssize_t __weak cpu_show_meltdown(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_spectre_v1(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_spectre_v2(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_spec_store_bypass(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_l1tf(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_mds(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_tsx_async_abort(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_itlb_multihit(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_srbds(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "Not affected\n");
+ return sysfs_emit(buf, "Not affected\n");
}

ssize_t __weak cpu_show_mmio_stale_data(struct device *dev,
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 4b57cf5bc81d..7cb90e4ac4a6 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -698,7 +698,7 @@ static ssize_t firmware_loading_show(struct device *dev,
loading = fw_state_is_loading(&fw_priv->buf->fw_st);
mutex_unlock(&fw_lock);

- return sprintf(buf, "%d\n", loading);
+ return sysfs_emit(buf, "%d\n", loading);
}

/* Some architectures don't have PAGE_KERNEL_RO */
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index fe1557aa9b10..39359fb9146b 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -116,7 +116,7 @@ static ssize_t show_mem_start_phys_index(struct device *dev,
unsigned long phys_index;

phys_index = mem->start_section_nr / sections_per_block;
- return sprintf(buf, "%08lx\n", phys_index);
+ return sysfs_emit(buf, "%08lx\n", phys_index);
}

/*
@@ -140,7 +140,7 @@ static ssize_t show_mem_removable(struct device *dev,
}

out:
- return sprintf(buf, "%d\n", ret);
+ return sysfs_emit(buf, "%d\n", ret);
}

/*
@@ -158,17 +158,17 @@ static ssize_t show_mem_state(struct device *dev,
*/
switch (mem->state) {
case MEM_ONLINE:
- len = sprintf(buf, "online\n");
+ len = sysfs_emit(buf, "online\n");
break;
case MEM_OFFLINE:
- len = sprintf(buf, "offline\n");
+ len = sysfs_emit(buf, "offline\n");
break;
case MEM_GOING_OFFLINE:
- len = sprintf(buf, "going-offline\n");
+ len = sysfs_emit(buf, "going-offline\n");
break;
default:
- len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
- mem->state);
+ len = sysfs_emit(buf, "ERROR-UNKNOWN-%ld\n",
+ mem->state);
WARN_ON(1);
break;
}
@@ -385,7 +385,7 @@ static ssize_t show_phys_device(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem = to_memory_block(dev);
- return sprintf(buf, "%d\n", mem->phys_device);
+ return sysfs_emit(buf, "%d\n", mem->phys_device);
}

#ifdef CONFIG_MEMORY_HOTREMOVE
@@ -417,7 +417,7 @@ static ssize_t show_valid_zones(struct device *dev,
* This can happen e.g. for ZONE_DMA and ZONE_DMA32
*/
if (!test_pages_in_a_zone(start_pfn, start_pfn + nr_pages, &valid_start_pfn, &valid_end_pfn))
- return sprintf(buf, "none\n");
+ return sysfs_emit(buf, "none\n");

start_pfn = valid_start_pfn;
nr_pages = valid_end_pfn - start_pfn;
@@ -459,7 +459,7 @@ static ssize_t
print_block_size(struct device *dev, struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%lx\n", get_memory_block_size());
+ return sysfs_emit(buf, "%lx\n", get_memory_block_size());
}

static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL);
@@ -473,9 +473,9 @@ show_auto_online_blocks(struct device *dev, struct device_attribute *attr,
char *buf)
{
if (memhp_auto_online)
- return sprintf(buf, "online\n");
+ return sysfs_emit(buf, "online\n");
else
- return sprintf(buf, "offline\n");
+ return sysfs_emit(buf, "offline\n");
}

static ssize_t
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 57eef6b24448..a547867c2094 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -162,19 +162,19 @@ static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
static ssize_t node_read_numastat(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf,
- "numa_hit %lu\n"
- "numa_miss %lu\n"
- "numa_foreign %lu\n"
- "interleave_hit %lu\n"
- "local_node %lu\n"
- "other_node %lu\n",
- sum_zone_numa_state(dev->id, NUMA_HIT),
- sum_zone_numa_state(dev->id, NUMA_MISS),
- sum_zone_numa_state(dev->id, NUMA_FOREIGN),
- sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
- sum_zone_numa_state(dev->id, NUMA_LOCAL),
- sum_zone_numa_state(dev->id, NUMA_OTHER));
+ return sysfs_emit(buf,
+ "numa_hit %lu\n"
+ "numa_miss %lu\n"
+ "numa_foreign %lu\n"
+ "interleave_hit %lu\n"
+ "local_node %lu\n"
+ "other_node %lu\n",
+ sum_zone_numa_state(dev->id, NUMA_HIT),
+ sum_zone_numa_state(dev->id, NUMA_MISS),
+ sum_zone_numa_state(dev->id, NUMA_FOREIGN),
+ sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
+ sum_zone_numa_state(dev->id, NUMA_LOCAL),
+ sum_zone_numa_state(dev->id, NUMA_OTHER));
}
static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0ee3cab88f70..d0847c17d725 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -909,7 +909,7 @@ static ssize_t driver_override_show(struct device *dev,
ssize_t len;

device_lock(dev);
- len = sprintf(buf, "%s\n", pdev->driver_override);
+ len = sysfs_emit(buf, "%s\n", pdev->driver_override);
device_unlock(dev);
return len;
}
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 156ab57bca77..b660446321c3 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -101,7 +101,7 @@ static const char ctrl_on[] = "on";
static ssize_t control_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%s\n",
+ return sysfs_emit(buf, "%s\n",
dev->power.runtime_auto ? ctrl_auto : ctrl_on);
}

@@ -133,7 +133,8 @@ static ssize_t rtpm_active_time_show(struct device *dev,
int ret;
spin_lock_irq(&dev->power.lock);
update_pm_runtime_accounting(dev);
- ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
+ ret = sysfs_emit(buf, "%i\n",
+ jiffies_to_msecs(dev->power.active_jiffies));
spin_unlock_irq(&dev->power.lock);
return ret;
}
@@ -146,8 +147,8 @@ static ssize_t rtpm_suspended_time_show(struct device *dev,
int ret;
spin_lock_irq(&dev->power.lock);
update_pm_runtime_accounting(dev);
- ret = sprintf(buf, "%i\n",
- jiffies_to_msecs(dev->power.suspended_jiffies));
+ ret = sysfs_emit(buf, "%i\n",
+ jiffies_to_msecs(dev->power.suspended_jiffies));
spin_unlock_irq(&dev->power.lock);
return ret;
}
@@ -181,7 +182,7 @@ static ssize_t rtpm_status_show(struct device *dev,
return -EIO;
}
}
- return sprintf(buf, p);
+ return sysfs_emit(buf, p);
}

static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
@@ -191,7 +192,7 @@ static ssize_t autosuspend_delay_ms_show(struct device *dev,
{
if (!dev->power.use_autosuspend)
return -EIO;
- return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
+ return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay);
}

static ssize_t autosuspend_delay_ms_store(struct device *dev,
@@ -218,7 +219,7 @@ static ssize_t pm_qos_resume_latency_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
+ return sysfs_emit(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
}

static ssize_t pm_qos_resume_latency_store(struct device *dev,
@@ -249,11 +250,11 @@ static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
s32 value = dev_pm_qos_get_user_latency_tolerance(dev);

if (value < 0)
- return sprintf(buf, "auto\n");
+ return sysfs_emit(buf, "auto\n");
else if (value == PM_QOS_LATENCY_ANY)
- return sprintf(buf, "any\n");
+ return sysfs_emit(buf, "any\n");

- return sprintf(buf, "%d\n", value);
+ return sysfs_emit(buf, "%d\n", value);
}

static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
@@ -286,8 +287,8 @@ static ssize_t pm_qos_no_power_off_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
- & PM_QOS_FLAG_NO_POWER_OFF));
+ return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
+ & PM_QOS_FLAG_NO_POWER_OFF));
}

static ssize_t pm_qos_no_power_off_store(struct device *dev,
@@ -313,8 +314,8 @@ static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
- & PM_QOS_FLAG_REMOTE_WAKEUP));
+ return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
+ & PM_QOS_FLAG_REMOTE_WAKEUP));
}

static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
@@ -343,9 +344,9 @@ static const char _disabled[] = "disabled";
static ssize_t
wake_show(struct device * dev, struct device_attribute *attr, char * buf)
{
- return sprintf(buf, "%s\n", device_can_wakeup(dev)
- ? (device_may_wakeup(dev) ? _enabled : _disabled)
- : "");
+ return sysfs_emit(buf, "%s\n", device_can_wakeup(dev)
+ ? (device_may_wakeup(dev) ? _enabled : _disabled)
+ : "");
}

static ssize_t
@@ -538,26 +539,26 @@ static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
static ssize_t rtpm_usagecount_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
+ return sysfs_emit(buf, "%d\n", atomic_read(&dev->power.usage_count));
}

static ssize_t rtpm_children_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", dev->power.ignore_children ?
- 0 : atomic_read(&dev->power.child_count));
+ return sysfs_emit(buf, "%d\n", dev->power.ignore_children ?
+ 0 : atomic_read(&dev->power.child_count));
}

static ssize_t rtpm_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
- return sprintf(buf, "disabled & forbidden\n");
+ return sysfs_emit(buf, "disabled & forbidden\n");
else if (dev->power.disable_depth)
- return sprintf(buf, "disabled\n");
+ return sysfs_emit(buf, "disabled\n");
else if (dev->power.runtime_auto == false)
- return sprintf(buf, "forbidden\n");
- return sprintf(buf, "enabled\n");
+ return sysfs_emit(buf, "forbidden\n");
+ return sysfs_emit(buf, "enabled\n");
}

static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
@@ -568,9 +569,9 @@ static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
static ssize_t async_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- return sprintf(buf, "%s\n",
- device_async_suspend_enabled(dev) ?
- _enabled : _disabled);
+ return sysfs_emit(buf, "%s\n",
+ device_async_suspend_enabled(dev) ?
+ _enabled : _disabled);
}

static ssize_t async_store(struct device *dev, struct device_attribute *attr,
diff --git a/drivers/base/soc.c b/drivers/base/soc.c
index 1242b2d2e01a..0e7ab127c5c4 100644
--- a/drivers/base/soc.c
+++ b/drivers/base/soc.c
@@ -72,13 +72,13 @@ static ssize_t soc_info_get(struct device *dev,
struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);

if (attr == &dev_attr_machine)
- return sprintf(buf, "%s\n", soc_dev->attr->machine);
+ return sysfs_emit(buf, "%s\n", soc_dev->attr->machine);
if (attr == &dev_attr_family)
- return sprintf(buf, "%s\n", soc_dev->attr->family);
+ return sysfs_emit(buf, "%s\n", soc_dev->attr->family);
if (attr == &dev_attr_revision)
- return sprintf(buf, "%s\n", soc_dev->attr->revision);
+ return sysfs_emit(buf, "%s\n", soc_dev->attr->revision);
if (attr == &dev_attr_soc_id)
- return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
+ return sysfs_emit(buf, "%s\n", soc_dev->attr->soc_id);

return -EINVAL;

--
2.38.1