linux-kernel - Re: [PATCH 3/9] staging: ks7010: Return directly after a failed kmalloc()

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Date:	Sun, 17 Jul 2016 20:58:14 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wolfram Sang <wsa@...-dreams.de>, devel@...verdev.osuosl.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/9] staging: ks7010: Return directly after a failed
 kmalloc()



On Sun, 17 Jul 2016, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 17 Jul 2016 15:55:02 +0200
>
> Return directly after a memory allocation failed at the beginning.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/staging/ks7010/ks7010_sdio.c | 19 +++++++------------
>  1 file changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/ks7010/ks7010_sdio.c b/drivers/staging/ks7010/ks7010_sdio.c
> index 3622fba..9b954cb 100644
> --- a/drivers/staging/ks7010/ks7010_sdio.c
> +++ b/drivers/staging/ks7010/ks7010_sdio.c
> @@ -713,10 +713,8 @@ static int ks7010_sdio_update_index(struct ks_wlan_private *priv, u32 index)
>  	unsigned char *data_buf;
>
>  	data_buf = kmalloc(sizeof(u32), GFP_KERNEL);
> -	if (!data_buf) {
> -		rc = 1;
> -		goto error_out;
> -	}
> +	if (!data_buf)
> +		return 1;

One could rather wonder why the function has such strange error values...

julia

>
>  	memcpy(data_buf, &index, sizeof(index));
>  	retval = ks7010_sdio_write(priv, WRITE_INDEX, data_buf, sizeof(index));
> @@ -744,10 +742,9 @@ static int ks7010_sdio_data_compare(struct ks_wlan_private *priv, u32 address,
>  	unsigned char *read_buf;
>
>  	read_buf = kmalloc(ROM_BUFF_SIZE, GFP_KERNEL);
> -	if (!read_buf) {
> -		rc = 1;
> -		goto error_out;
> -	}
> +	if (!read_buf)
> +		return 1;
> +
>  	retval = ks7010_sdio_read(priv, address, read_buf, size);
>  	if (retval) {
>  		rc = 2;
> @@ -777,10 +774,8 @@ static int ks7010_upload_firmware(struct ks_wlan_private *priv,
>
>  	/* buffer allocate */
>  	rom_buf = kmalloc(ROM_BUFF_SIZE, GFP_KERNEL);
> -	if (!rom_buf) {
> -		rc = 3;
> -		goto error_out0;
> -	}
> +	if (!rom_buf)
> +		return 3;
>
>  	sdio_claim_host(card->func);
>
> --
> 2.9.1
>
>