Re: [PATCH] scsi: pm8001: Use sysfs_emit in show function callsbacks

From: Jinpu Wang
Date: Mon Jan 02 2023 - 09:33:44 EST

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On Thu, Dec 8, 2022 at 9:11 PM Deepak R Varma <drv@xxxxxxxxx> wrote:
>
> According to Documentation/filesystems/sysfs.rst, the show() callback
> function of kobject attributes should strictly use sysfs_emit instead
> of sprintf family functions.
> Issue identified using the coccinelle device_attr_show.cocci script.
>
> Signed-off-by: Deepak R Varma <drv@xxxxxxxxx>
thx!
Acked-by: Jack Wang <jinpu.wang@xxxxxxxxx>
> ---
> drivers/scsi/pm8001/pm8001_ctl.c | 48 +++++++++++++++-----------------
> 1 file changed, 22 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
> index 73f036bed128..8cfdf9b412c9 100644
> --- a/drivers/scsi/pm8001/pm8001_ctl.c
> +++ b/drivers/scsi/pm8001/pm8001_ctl.c
> @@ -61,10 +61,10 @@ static ssize_t pm8001_ctl_mpi_interface_rev_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id == chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->main_cfg_tbl.pm8001_tbl.interface_rev);
> } else {
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->main_cfg_tbl.pm80xx_tbl.interface_rev);
> }
> }
> @@ -86,7 +86,7 @@ static ssize_t controller_fatal_error_show(struct device *cdev,
> struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->controller_fatal_error);
> }
> static DEVICE_ATTR_RO(controller_fatal_error);
> @@ -107,13 +107,13 @@ static ssize_t pm8001_ctl_fw_version_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id == chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
> + return sysfs_emit(buf, "%02x.%02x.%02x.%02x\n",
> (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 24),
> (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 16),
> (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev >> 8),
> (u8)(pm8001_ha->main_cfg_tbl.pm8001_tbl.firmware_rev));
> } else {
> - return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
> + return sysfs_emit(buf, "%02x.%02x.%02x.%02x\n",
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 24),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 16),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.firmware_rev >> 8),
> @@ -138,7 +138,7 @@ static ssize_t pm8001_ctl_ila_version_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id != chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
> + return sysfs_emit(buf, "%02x.%02x.%02x.%02x\n",
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.ila_version >> 24),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.ila_version >> 16),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.ila_version >> 8),
> @@ -164,7 +164,7 @@ static ssize_t pm8001_ctl_inactive_fw_version_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id != chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
> + return sysfs_emit(buf, "%02x.%02x.%02x.%02x\n",
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.inc_fw_version >> 24),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.inc_fw_version >> 16),
> (u8)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.inc_fw_version >> 8),
> @@ -191,10 +191,10 @@ static ssize_t pm8001_ctl_max_out_io_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id == chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->main_cfg_tbl.pm8001_tbl.max_out_io);
> } else {
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_out_io);
> }
> }
> @@ -215,13 +215,11 @@ static ssize_t pm8001_ctl_max_devices_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id == chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%04d\n",
> - (u16)(pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl >> 16)
> - );
> + return sysfs_emit(buf, "%04d\n",
> + (u16)(pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl >> 16));
> } else {
> - return snprintf(buf, PAGE_SIZE, "%04d\n",
> - (u16)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl >> 16)
> - );
> + return sysfs_emit(buf, "%04d\n",
> + (u16)(pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl >> 16));
> }
> }
> static DEVICE_ATTR(max_devices, S_IRUGO, pm8001_ctl_max_devices_show, NULL);
> @@ -242,13 +240,11 @@ static ssize_t pm8001_ctl_max_sg_list_show(struct device *cdev,
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> if (pm8001_ha->chip_id == chip_8001) {
> - return snprintf(buf, PAGE_SIZE, "%04d\n",
> - pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl & 0x0000FFFF
> - );
> + return sysfs_emit(buf, "%04d\n",
> + pm8001_ha->main_cfg_tbl.pm8001_tbl.max_sgl & 0x0000FFFF);
> } else {
> - return snprintf(buf, PAGE_SIZE, "%04d\n",
> - pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl & 0x0000FFFF
> - );
> + return sysfs_emit(buf, "%04d\n",
> + pm8001_ha->main_cfg_tbl.pm80xx_tbl.max_sgl & 0x0000FFFF);
> }
> }
> static DEVICE_ATTR(max_sg_list, S_IRUGO, pm8001_ctl_max_sg_list_show, NULL);
> @@ -315,7 +311,7 @@ static ssize_t pm8001_ctl_host_sas_address_show(struct device *cdev,
> struct Scsi_Host *shost = class_to_shost(cdev);
> struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
> - return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
> + return sysfs_emit(buf, "0x%016llx\n",
> be64_to_cpu(*(__be64 *)pm8001_ha->sas_addr));
> }
> static DEVICE_ATTR(host_sas_address, S_IRUGO,
> @@ -336,7 +332,7 @@ static ssize_t pm8001_ctl_logging_level_show(struct device *cdev,
> struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> - return snprintf(buf, PAGE_SIZE, "%08xh\n", pm8001_ha->logging_level);
> + return sysfs_emit(buf, "%08xh\n", pm8001_ha->logging_level);
> }
>
> static ssize_t pm8001_ctl_logging_level_store(struct device *cdev,
> @@ -517,7 +513,7 @@ static ssize_t event_log_size_show(struct device *cdev,
> struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> pm8001_ha->main_cfg_tbl.pm80xx_tbl.event_log_size);
> }
> static DEVICE_ATTR_RO(event_log_size);
> @@ -604,7 +600,7 @@ static ssize_t non_fatal_count_show(struct device *cdev,
> struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
>
> - return snprintf(buf, PAGE_SIZE, "%08x",
> + return sysfs_emit(buf, "%08x",
> pm8001_ha->non_fatal_count);
> }
>
> @@ -884,7 +880,7 @@ static ssize_t pm8001_show_update_fw(struct device *cdev,
> if (pm8001_ha->fw_status != FLASH_IN_PROGRESS)
> pm8001_ha->fw_status = FLASH_OK;
>
> - return snprintf(buf, PAGE_SIZE, "status=%x %s\n",
> + return sysfs_emit(buf, "status=%x %s\n",
> flash_error_table[i].err_code,
> flash_error_table[i].reason);
> }
> --
> 2.34.1
>
>
>

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