linux-kernel - Re: [PATCH] driver core: Add log when devtmpfs create node failed

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Message-ID: <2024052221-pulverize-worrisome-37fb@gregkh>
Date: Wed, 22 May 2024 14:23:28 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Xingui Yang <yangxingui@...wei.com>
Cc: rafael@...nel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxarm@...wei.com,
	prime.zeng@...ilicon.com, liyihang9@...wei.com,
	kangfenglong@...wei.com
Subject: Re: [PATCH] driver core: Add log when devtmpfs create node failed

On Wed, May 22, 2024 at 11:43:46AM +0000, Xingui Yang wrote:
> Currently, no exception information is output when devtmpfs create node
> failed, so add log info for it.

Why?  Who is going to do something with this?

> 
> Signed-off-by: Xingui Yang <yangxingui@...wei.com>
> ---
>  drivers/base/core.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 5f4e03336e68..32a41e0472b2 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3691,7 +3691,10 @@ int device_add(struct device *dev)
>  		if (error)
>  			goto SysEntryError;
>  
> -		devtmpfs_create_node(dev);
> +		error = devtmpfs_create_node(dev);
> +		if (error)
> +			pr_info("devtmpfs create node for %s failed: %d\n",
> +				dev_name(dev), error);

Why is an error message pr_info()?

And again, why is this needed?  If this needs to be checked, why are you
now checking it but ignoring the error?

What would this help with?

thanks,

greg k-h