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Subject[PATCH] coccinelle: api: fix device_attr_show.cocci warnings
From: kernel test robot <>

drivers/acpi/dock.c:563:8-16: WARNING: use scnprintf or sprintf
drivers/acpi/dock.c:544:8-16: WARNING: use scnprintf or sprintf
drivers/acpi/dock.c:495:8-16: WARNING: use scnprintf or sprintf
drivers/acpi/dock.c:506:8-16: WARNING: use scnprintf or sprintf

From Documentation/filesystems/sysfs.txt:
show() must not use snprintf() when formatting the value to be
returned to user space. If you can guarantee that an overflow
will never happen you can use sprintf() otherwise you must use

Generated by: scripts/coccinelle/api/device_attr_show.cocci

Fixes: abfc19ff202d ("coccinelle: api: add device_attr_show script")
CC: Denis Efremov <>
Signed-off-by: kernel test robot <>

tree: master
head: 7c2a69f610e64c8dec6a06a66e721f4ce1dd783a
commit: abfc19ff202d287742483e15fd478ddd6ada2187 coccinelle: api: add device_attr_show script

Please take the patch only if it's a positive warning. Thanks!

dock.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -492,7 +492,7 @@ static ssize_t show_docked(struct device
struct acpi_device *adev = NULL;

acpi_bus_get_device(dock_station->handle, &adev);
- return snprintf(buf, PAGE_SIZE, "%u\n", acpi_device_enumerated(adev));
+ return scnprintf(buf, PAGE_SIZE, "%u\n", acpi_device_enumerated(adev));
static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);

@@ -503,7 +503,7 @@ static ssize_t show_flags(struct device
struct device_attribute *attr, char *buf)
struct dock_station *dock_station = dev->platform_data;
- return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
+ return scnprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);

static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
@@ -541,7 +541,7 @@ static ssize_t show_dock_uid(struct devi
if (ACPI_FAILURE(status))
return 0;

- return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf);
+ return scnprintf(buf, PAGE_SIZE, "%llx\n", lbuf);
static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);

@@ -560,7 +560,7 @@ static ssize_t show_dock_type(struct dev
type = "unknown";

- return snprintf(buf, PAGE_SIZE, "%s\n", type);
+ return scnprintf(buf, PAGE_SIZE, "%s\n", type);
static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL);

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