on 2/25/2024 12:59 AM, Bruno Prémont wrote:
> 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.
Yeah, previously, i intended to do the conversion for the files
reported by coccinelle(snprintf() only),
Think more, I should consider the whole s*printf() family for these
files at the same time.
This will be done in V2.
Thanks
Li, Zhijian
>
>
>
> 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
