linux-kernel - Re: [PATCH v2] Input: iqs626a - Use scope-based resource management in iqs626_parse

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Date: Mon, 4 Mar 2024 11:55:23 +0100 (CET)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Markus Elfring <Markus.Elfring@....de>
cc: linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org, 
    Dmitry Torokhov <dmitry.torokhov@...il.com>, 
    Jeff LaBundy <jeff@...undy.com>, Rob Herring <robh@...nel.org>, 
    Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
    LKML <linux-kernel@...r.kernel.org>, 
    Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v2] Input: iqs626a - Use scope-based resource management
 in iqs626_parse_events()



On Mon, 4 Mar 2024, Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 4 Mar 2024 11:40:04 +0100
>
> Scope-based resource management became supported also for this software
> area by contributions of Jonathan Cameron on 2024-02-17.
>
> device property: Add cleanup.h based fwnode_handle_put() scope based cleanup.
> https://lore.kernel.org/r/20240217164249.921878-3-jic23@kernel.org
>
>
> * Thus use the attribute “__free(fwnode_handle)”.
>
> * Reduce the scope for the local variable “ev_node” into a for loop.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>
> v2:
> An other cleanup technique was applied as requested by Dmitry Torokhov
> and Jeff LaBundy.
>
>
>  drivers/input/misc/iqs626a.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/input/misc/iqs626a.c b/drivers/input/misc/iqs626a.c
> index 0dab54d3a060..86fcb5134f45 100644
> --- a/drivers/input/misc/iqs626a.c
> +++ b/drivers/input/misc/iqs626a.c
> @@ -462,7 +462,6 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  {
>  	struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
>  	struct i2c_client *client = iqs626->client;
> -	struct fwnode_handle *ev_node;
>  	const char *ev_name;
>  	u8 *thresh, *hyst;
>  	unsigned int val;
> @@ -501,6 +500,8 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  		if (!iqs626_channels[ch_id].events[i])
>  			continue;
>
> +		struct fwnode_handle *ev_node __free(fwnode_handle);

Doesn't this need to be initialized?

julia


> +
>  		if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
>  			/*
>  			 * Trackpad touch events are simply described under the
> @@ -530,7 +531,6 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  					dev_err(&client->dev,
>  						"Invalid input type: %u\n",
>  						val);
> -					fwnode_handle_put(ev_node);
>  					return -EINVAL;
>  				}
>
> @@ -545,7 +545,6 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  				dev_err(&client->dev,
>  					"Invalid %s channel hysteresis: %u\n",
>  					fwnode_get_name(ch_node), val);
> -				fwnode_handle_put(ev_node);
>  				return -EINVAL;
>  			}
>
> @@ -566,7 +565,6 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  				dev_err(&client->dev,
>  					"Invalid %s channel threshold: %u\n",
>  					fwnode_get_name(ch_node), val);
> -				fwnode_handle_put(ev_node);
>  				return -EINVAL;
>  			}
>
> @@ -575,8 +573,6 @@ iqs626_parse_events(struct iqs626_private *iqs626,
>  			else
>  				*(thresh + iqs626_events[i].th_offs) = val;
>  		}
> -
> -		fwnode_handle_put(ev_node);
>  	}
>
>  	return 0;
> --
> 2.44.0
>
>
>