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spi: sun4i: Add rx_buf NULL pointer check

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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>
Acked-by: Jagan Teki <jagan@openedev.com>
[jagan: fix commit message]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Stefan Mavrodiev 2018-12-05 14:27:57 +02:00 committed by Jagan Teki
parent 08337cd648
commit 5c1a87de58
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/sun4i_spi.c
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@ -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;
}
}