linux-kernel - Re: [PATCH v3 1/2] pci: endpoint: Simplify name allocation for epf device

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Date:   Tue, 27 Feb 2018 15:39:35 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Rolf Evers-Fischer <embedded24@...rs-fischer.de>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <andy.shevchenko@...il.com>,
        Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
Subject: Re: [PATCH v3 1/2] pci: endpoint: Simplify name allocation for epf
 device

Hi,

On Tuesday 27 February 2018 03:32 PM, Rolf Evers-Fischer wrote:
> From: Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
> 
> This commit replaces allocating and freeing the intermediate
> 'buf'/'func_name' with a combination of 'kstrndup()' and 'len'.
> 
> 'len' is the required length of 'epf->name'.
> 'epf->name' should be either the first part of 'name' preceding the '.'
> or the complete 'name', if there is no '.' in the name.
> 
> Signed-off-by: Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
> ---
>  drivers/pci/endpoint/pci-epf-core.c | 22 ++++------------------
>  1 file changed, 4 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
> index 766ce1dca2ec..1f2506f32bb9 100644
> --- a/drivers/pci/endpoint/pci-epf-core.c
> +++ b/drivers/pci/endpoint/pci-epf-core.c
> @@ -200,8 +200,7 @@ struct pci_epf *pci_epf_create(const char *name)
>  	int ret;
>  	struct pci_epf *epf;
>  	struct device *dev;
> -	char *func_name;
> -	char *buf;
> +	int len;
>  
>  	epf = kzalloc(sizeof(*epf), GFP_KERNEL);
>  	if (!epf) {
> @@ -209,20 +208,11 @@ struct pci_epf *pci_epf_create(const char *name)
>  		goto err_ret;
>  	}
>  
> -	buf = kstrdup(name, GFP_KERNEL);
> -	if (!buf) {
> -		ret = -ENOMEM;
> -		goto free_epf;
> -	}
> -
> -	func_name = buf;
> -	buf = strchrnul(buf, '.');
> -	*buf = '\0';
> -
> -	epf->name = kstrdup(func_name, GFP_KERNEL);
> +	len = strchrnul(name, '.') - name;
> +	epf->name = kstrndup(name, len, GFP_KERNEL);

shouldn't the string end with '\0'?

Thanks
Kishon