Re: [PATCH RESEND] most: core: Use sysfs_emit in show function callsbacks

[<Parthiban.Veerasooran@microchip.com>]

On 02/03/23 1:01 am, Deepak R Varma wrote:
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> 
> 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@mailo.com>
Acked-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>
> ---
> Note: Resending the patch for review and feedback. No functional changes.
> 
> 
>   drivers/most/core.c | 61 ++++++++++++++++++++++-----------------------
>   1 file changed, 30 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/most/core.c b/drivers/most/core.c
> index e4412c7d25b0..f9ca6a7d885c 100644
> --- a/drivers/most/core.c
> +++ b/drivers/most/core.c
> @@ -208,8 +208,8 @@ static ssize_t number_of_packet_buffers_show(struct device *dev,
>          struct most_channel *c = to_channel(dev);
>          unsigned int i = c->channel_id;
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n",
> -                       c->iface->channel_vector[i].num_buffers_packet);
> +       return sysfs_emit(buf, "%d\n",
> +                         c->iface->channel_vector[i].num_buffers_packet);
>   }
> 
>   static ssize_t number_of_stream_buffers_show(struct device *dev,
> @@ -219,8 +219,8 @@ static ssize_t number_of_stream_buffers_show(struct device *dev,
>          struct most_channel *c = to_channel(dev);
>          unsigned int i = c->channel_id;
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n",
> -                       c->iface->channel_vector[i].num_buffers_streaming);
> +       return sysfs_emit(buf, "%d\n",
> +                         c->iface->channel_vector[i].num_buffers_streaming);
>   }
> 
>   static ssize_t size_of_packet_buffer_show(struct device *dev,
> @@ -230,8 +230,8 @@ static ssize_t size_of_packet_buffer_show(struct device *dev,
>          struct most_channel *c = to_channel(dev);
>          unsigned int i = c->channel_id;
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n",
> -                       c->iface->channel_vector[i].buffer_size_packet);
> +       return sysfs_emit(buf, "%d\n",
> +                         c->iface->channel_vector[i].buffer_size_packet);
>   }
> 
>   static ssize_t size_of_stream_buffer_show(struct device *dev,
> @@ -241,8 +241,8 @@ static ssize_t size_of_stream_buffer_show(struct device *dev,
>          struct most_channel *c = to_channel(dev);
>          unsigned int i = c->channel_id;
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n",
> -                       c->iface->channel_vector[i].buffer_size_streaming);
> +       return sysfs_emit(buf, "%d\n",
> +                         c->iface->channel_vector[i].buffer_size_streaming);
>   }
> 
>   static ssize_t channel_starving_show(struct device *dev,
> @@ -251,7 +251,7 @@ static ssize_t channel_starving_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
> +       return sysfs_emit(buf, "%d\n", c->is_starving);
>   }
> 
>   static ssize_t set_number_of_buffers_show(struct device *dev,
> @@ -260,7 +260,7 @@ static ssize_t set_number_of_buffers_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
> +       return sysfs_emit(buf, "%d\n", c->cfg.num_buffers);
>   }
> 
>   static ssize_t set_buffer_size_show(struct device *dev,
> @@ -269,7 +269,7 @@ static ssize_t set_buffer_size_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
> +       return sysfs_emit(buf, "%d\n", c->cfg.buffer_size);
>   }
> 
>   static ssize_t set_direction_show(struct device *dev,
> @@ -279,10 +279,10 @@ static ssize_t set_direction_show(struct device *dev,
>          struct most_channel *c = to_channel(dev);
> 
>          if (c->cfg.direction & MOST_CH_TX)
> -               return snprintf(buf, PAGE_SIZE, "tx\n");
> +               return sysfs_emit(buf, "tx\n");
>          else if (c->cfg.direction & MOST_CH_RX)
> -               return snprintf(buf, PAGE_SIZE, "rx\n");
> -       return snprintf(buf, PAGE_SIZE, "unconfigured\n");
> +               return sysfs_emit(buf, "rx\n");
> +       return sysfs_emit(buf, "unconfigured\n");
>   }
> 
>   static ssize_t set_datatype_show(struct device *dev,
> @@ -294,10 +294,9 @@ static ssize_t set_datatype_show(struct device *dev,
> 
>          for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
>                  if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
> -                       return snprintf(buf, PAGE_SIZE, "%s",
> -                                       ch_data_type[i].name);
> +                       return sysfs_emit(buf, "%s", ch_data_type[i].name);
>          }
> -       return snprintf(buf, PAGE_SIZE, "unconfigured\n");
> +       return sysfs_emit(buf, "unconfigured\n");
>   }
> 
>   static ssize_t set_subbuffer_size_show(struct device *dev,
> @@ -306,7 +305,7 @@ static ssize_t set_subbuffer_size_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
> +       return sysfs_emit(buf, "%d\n", c->cfg.subbuffer_size);
>   }
> 
>   static ssize_t set_packets_per_xact_show(struct device *dev,
> @@ -315,7 +314,7 @@ static ssize_t set_packets_per_xact_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
> +       return sysfs_emit(buf, "%d\n", c->cfg.packets_per_xact);
>   }
> 
>   static ssize_t set_dbr_size_show(struct device *dev,
> @@ -323,7 +322,7 @@ static ssize_t set_dbr_size_show(struct device *dev,
>   {
>          struct most_channel *c = to_channel(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
> +       return sysfs_emit(buf, "%d\n", c->cfg.dbr_size);
>   }
> 
>   #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
> @@ -395,7 +394,7 @@ static ssize_t description_show(struct device *dev,
>   {
>          struct most_interface *iface = dev_get_drvdata(dev);
> 
> -       return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
> +       return sysfs_emit(buf, "%s\n", iface->description);
>   }
> 
>   static ssize_t interface_show(struct device *dev,
> @@ -406,25 +405,25 @@ static ssize_t interface_show(struct device *dev,
> 
>          switch (iface->interface) {
>          case ITYPE_LOOPBACK:
> -               return snprintf(buf, PAGE_SIZE, "loopback\n");
> +               return sysfs_emit(buf, "loopback\n");
>          case ITYPE_I2C:
> -               return snprintf(buf, PAGE_SIZE, "i2c\n");
> +               return sysfs_emit(buf, "i2c\n");
>          case ITYPE_I2S:
> -               return snprintf(buf, PAGE_SIZE, "i2s\n");
> +               return sysfs_emit(buf, "i2s\n");
>          case ITYPE_TSI:
> -               return snprintf(buf, PAGE_SIZE, "tsi\n");
> +               return sysfs_emit(buf, "tsi\n");
>          case ITYPE_HBI:
> -               return snprintf(buf, PAGE_SIZE, "hbi\n");
> +               return sysfs_emit(buf, "hbi\n");
>          case ITYPE_MEDIALB_DIM:
> -               return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
> +               return sysfs_emit(buf, "mlb_dim\n");
>          case ITYPE_MEDIALB_DIM2:
> -               return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
> +               return sysfs_emit(buf, "mlb_dim2\n");
>          case ITYPE_USB:
> -               return snprintf(buf, PAGE_SIZE, "usb\n");
> +               return sysfs_emit(buf, "usb\n");
>          case ITYPE_PCIE:
> -               return snprintf(buf, PAGE_SIZE, "pcie\n");
> +               return sysfs_emit(buf, "pcie\n");
>          }
> -       return snprintf(buf, PAGE_SIZE, "unknown\n");
> +       return sysfs_emit(buf, "unknown\n");
>   }
> 
>   static DEVICE_ATTR_RO(description);
> --
> 2.34.1
> 
> 
>