Hi Li,
While only looking for the snprintf() in your coccinelle analysis you
probably also want to look for sprintf() (see e.g. else clause in
hid-sensor-custom.c and scnprintf() (see picolcd_fb_update_rate_show
in hid-picolcd_fb.c) to replace more s*printf() calls with sysfs_emit*
variants.
diff --git a/drivers/hid/hid-picolcd_fb.c b/drivers/hid/hid-picolcd_fb.c
index d726aaafb146..03074d25d662 100644
--- a/drivers/hid/hid-picolcd_fb.c
+++ b/drivers/hid/hid-picolcd_fb.c
@@ -459,9 +459,9 @@ static ssize_t picolcd_fb_update_rate_show(struct device *dev,
if (ret >= PAGE_SIZE)
break;
else if (i == fb_update_rate)
- ret += scnprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
+ ret += sysfs_emit_at(buf, ret, "[%u] ", i);
else
- ret += scnprintf(buf+ret, PAGE_SIZE-ret, "%u ", i);
+ ret += sysfs_emit_at(buf, ret, "%u ", i);
if (ret > 0)
buf[min(ret, (size_t)PAGE_SIZE)-1] = '\n';
return ret;
For hid-picolcd-*.c,
Acked-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
but preferably with the scnprintf() case is covered too.
Cheers,
Bruno
On Tue, 16 Jan 2024 12:51:20 +0800 Li Zhijian wrote:
> Per Documentation/filesystems/sysfs.rst, show() should only use sysfs_emit()
> or sysfs_emit_at() when formatting the value to be returned to user space.
>
> coccinelle complains that there are still a couple of functions that use
> snprintf(). Convert them to sysfs_emit().
>
> > ./drivers/hid/hid-picolcd_core.c:259:9-17: WARNING: please use sysfs_emit
> > ./drivers/hid/hid-picolcd_core.c:304:8-16: WARNING: please use sysfs_emit
> > ./drivers/hid/hid-sensor-custom.c:375:10-18: WARNING: please use sysfs_emi
>
> No functional change intended
>
> CC: "Bruno Prémont" <bonbons@xxxxxxxxxxxxxxxxx>
> CC: Jiri Kosina <jikos@xxxxxxxxxx>
> CC: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> CC: Jonathan Cameron <jic23@xxxxxxxxxx>
> CC: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
> CC: linux-input@xxxxxxxxxxxxxxx
> Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
> ---
> drivers/hid/hid-picolcd_core.c | 6 +++---
> drivers/hid/hid-sensor-custom.c | 3 +--
> 2 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
> index bbda231a7ce3..fa46fb6eab3f 100644
> --- a/drivers/hid/hid-picolcd_core.c
> +++ b/drivers/hid/hid-picolcd_core.c
> @@ -256,9 +256,9 @@ static ssize_t picolcd_operation_mode_show(struct device *dev,
> struct picolcd_data *data = dev_get_drvdata(dev);
>
> if (data->status & PICOLCD_BOOTLOADER)
> - return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
> + return sysfs_emit(buf, "[bootloader] lcd\n");
> else
> - return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
> + return sysfs_emit(buf, "bootloader [lcd]\n");
> }
>
> static ssize_t picolcd_operation_mode_store(struct device *dev,
> @@ -301,7 +301,7 @@ static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
> {
> struct picolcd_data *data = dev_get_drvdata(dev);
>
> - return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
> + return sysfs_emit(buf, "%hu\n", data->opmode_delay);
> }
>
> static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
> diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
> index d85398721659..4fe8dccf671d 100644
> --- a/drivers/hid/hid-sensor-custom.c
> +++ b/drivers/hid/hid-sensor-custom.c
> @@ -372,8 +372,7 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
> sizeof(struct hid_custom_usage_desc),
> usage_id_cmp);
> if (usage_desc)
> - return snprintf(buf, PAGE_SIZE, "%s\n",
> - usage_desc->desc);
> + return sysfs_emit(buf, "%s\n", usage_desc->desc);
> else
> return sprintf(buf, "not-specified\n");
Shouldn't the sprintf() in the else clause be replaced as well?
> } else
