Re: [PATCH] staging: r888eu: use dynamic allocation for efuse buffer

[Pavel Skripkin]

Hi Martin,

Martin Kaiser <martin@xxxxxxxxx> says:
> Use kmalloc to allocate the efuse buffer in ReadAdapterInfo8188EU and
> free it on exit. This is better than using a 512 byte array on the stack.
>
> It's ok to drop the __aligned(4) qualifier. kmalloc aligns to
> ARCH_KMALLOC_MINALIGN, this is at least 8 bytes.
>
> Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Suggested-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> Signed-off-by: Martin Kaiser <martin@xxxxxxxxx>
> ---
>   drivers/staging/r8188eu/hal/usb_halinit.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/r8188eu/hal/usb_halinit.c b/drivers/staging/r8188eu/hal/usb_halinit.c
> index 8902dda7b8d8..421fe7c40390 100644
> --- a/drivers/staging/r8188eu/hal/usb_halinit.c
> +++ b/drivers/staging/r8188eu/hal/usb_halinit.c
> @@ -926,7 +926,7 @@ void ReadAdapterInfo8188EU(struct adapter *Adapter)
>   {
>   	struct eeprom_priv *eeprom = &Adapter->eeprompriv;
>   	struct led_priv *ledpriv = &Adapter->ledpriv;
> -	u8 efuse_buf[EFUSE_MAP_LEN_88E] __aligned(4);
> +	u8 *efuse_buf;
>   	u8 eeValue;
>   	int res;
>   
> @@ -937,7 +937,10 @@ void ReadAdapterInfo8188EU(struct adapter *Adapter)
>   
>   	eeprom->bautoload_fail_flag	= !(eeValue & EEPROM_EN);
>   
> -	memset(efuse_buf, 0xFF, sizeof(efuse_buf));
> +	efuse_buf = kmalloc(EFUSE_MAP_LEN_88E, GFP_KERNEL);
> +	if (!efuse_buf)
> +		return;

I think, it worth returning an error to caller. Functions right after 
the allocation do initialization, so leaving fields as-is seems to be 
dangerous





Thanks,
--Pavel Skripkin