[U-Boot] [PATCH 1/1] arm: sunxi: Add NULL pointer check

[Jagan Teki <jagan@amarulasolutions.com>]

On Thu, Dec 20, 2018 at 3:59 PM Stefan Mavrodiev <stefan@olimex.com> wrote:
>
>
> On 12/20/18 12:14 PM, Jagan Teki wrote:
> > On Fri, Dec 14, 2018 at 3:48 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
> >> On Wed, Dec 5, 2018 at 5:58 PM Stefan Mavrodiev <stefan@olimex.com> wrote:
> >>> Current driver doesn't check if the destination pointer is NULL.
> >>> This cause the data from the FIFO to be stored inside the internal
> >>> SDRAM ( address 0 ).
> >>>
> >>> The patch add simple check if the destination pointer is NULL.
> >>>
> >>> Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
> >>> ---
> >>>   drivers/spi/sun4i_spi.c | 3 ++-
> >>>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/spi/sun4i_spi.c b/drivers/spi/sun4i_spi.c
> >>> index b86b5a00ad..38cc743c61 100644
> >>> --- a/drivers/spi/sun4i_spi.c
> >>> +++ b/drivers/spi/sun4i_spi.c
> >>> @@ -129,7 +129,8 @@ static inline void sun4i_spi_drain_fifo(struct sun4i_spi_priv *priv, int len)
> >>>
> >>>          while (len--) {
> >>>                  byte = readb(&priv->regs->rxdata);
> >>> -               *priv->rx_buf++ = byte;
> >>> +               if (priv->rx_buf)
> >>> +                       *priv->rx_buf++ = byte;
> >> Acked-by: Jagan Teki <jagan@openedev.com>
> >>
> >> But, have you tested how much data in the fifo before drained? It's
> >> better we can get the available data before reading via fifo_sta
> I don't understand what's the point of doing this?

Didn't get? don't you understand what I'm saying or it not require
from point of you?