linux-kernel - Re: [PATCH 2/2] driver core: add helper for deferred probe reason setting

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Date:   Mon, 22 Mar 2021 09:20:40 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] driver core: add helper for deferred probe reason
 setting


W dniu 18.03.2021 o 08:39, Ahmad Fatoum pisze:
> We now have three places within the same file doing the same operation
> of freeing this pointer and setting it anew. A helper make this
> arguably easier to read, so add one.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

Regards

Andrzej

> ---
>   drivers/base/dd.c | 17 +++++++++++------
>   1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index e2cf3b29123e..4201baa1cc13 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -69,6 +69,12 @@ static char async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN];
>    */
>   static bool defer_all_probes;
>   
> +static void __device_set_deferred_probe_reason(const struct device *dev, char *reason)
> +{
> +	kfree(dev->p->deferred_probe_reason);
> +	dev->p->deferred_probe_reason = reason;
> +}
> +
>   /*
>    * deferred_probe_work_func() - Retry probing devices in the active list.
>    */
> @@ -97,8 +103,7 @@ static void deferred_probe_work_func(struct work_struct *work)
>   
>   		get_device(dev);
>   
> -		kfree(dev->p->deferred_probe_reason);
> -		dev->p->deferred_probe_reason = NULL;
> +		__device_set_deferred_probe_reason(dev, NULL);
>   
>   		/*
>   		 * Drop the mutex while probing each device; the probe path may
> @@ -140,8 +145,7 @@ void driver_deferred_probe_del(struct device *dev)
>   	if (!list_empty(&dev->p->deferred_probe)) {
>   		dev_dbg(dev, "Removed from deferred list\n");
>   		list_del_init(&dev->p->deferred_probe);
> -		kfree(dev->p->deferred_probe_reason);
> -		dev->p->deferred_probe_reason = NULL;
> +		__device_set_deferred_probe_reason(dev, NULL);
>   	}
>   	mutex_unlock(&deferred_probe_mutex);
>   }
> @@ -220,11 +224,12 @@ void device_unblock_probing(void)
>   void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf)
>   {
>   	const char *drv = dev_driver_string(dev);
> +	char *reason;
>   
>   	mutex_lock(&deferred_probe_mutex);
>   
> -	kfree(dev->p->deferred_probe_reason);
> -	dev->p->deferred_probe_reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf);
> +	reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf);
> +	__device_set_deferred_probe_reason(dev, reason);
>   
>   	mutex_unlock(&deferred_probe_mutex);
>   }