[U-Boot] [Patch V4 2/4] spi: fsl_qspi: Fix qspi_op_rdid memcpy issue

[york sun]

On 01/10/2016 06:15 PM, Gong Qianyu wrote:
> From: Gong Qianyu <Qianyu.Gong at freescale.com>
> 
> In current driver everytime we memcpy 4 bytes to the dest memory
> regardless of the remaining length.
> This patch adds checking the remaining length before memcpy.
> If the length is shorter than 4 bytes, memcpy the actual length of data
> to the dest memory.
> 
> Signed-off-by: Gong Qianyu <Qianyu.Gong at freescale.com>
> ---
> V2-V4:
>  - No change.
>  
>  drivers/spi/fsl_qspi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
> index 9f23c10..4d58211 100644
> --- a/drivers/spi/fsl_qspi.c
> +++ b/drivers/spi/fsl_qspi.c
> @@ -500,7 +500,10 @@ static void qspi_op_rdid(struct fsl_qspi_priv *priv, u32 *rxbuf, u32 len)
>  		if (rbsr_reg & QSPI_RBSR_RDBFL_MASK) {
>  			data = qspi_read32(priv->flags, &regs->rbdr[i]);
>  			data = qspi_endian_xchg(data);
> -			memcpy(rxbuf, &data, 4);
> +			if (size < 4)
> +				memcpy(rxbuf, &data, size);
> +			else
> +				memcpy(rxbuf, &data, 4);
>  			rxbuf++;
>  			size -= 4;
>  			i++;
> 

Doesn't the line "size -= 4" need a fix as well? I guess it runs OK for checking
(size > 0), but it looks odd.

York