On 1 and 2 bytes per word, the transfer of the 3 last bytes will access
memory outside tx_ptr.
Although this has not trigger any error on real hardware, we should
better fix this.
Fixes: 24ba5e593f391507 Remove rx_fn and tx_fn pointer
Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
---
v2:
v1 was completely wrong, sorry about that :(. This v2 has been tested on x86
1 byte per word
drivers/spi/spi-xilinx.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index d1901d5..133f53a 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -117,11 +117,26 @@ static unsigned int xspi_read32_be(void __iomem *addr)
static void xilinx_spi_tx(struct xilinx_spi *xspi)
{
+ u32 data = 0;
+
if (!xspi->tx_ptr) {
xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET);
return;
}
- xspi->write_fn(*(u32 *)(xspi->tx_ptr), xspi->regs + XSPI_TXD_OFFSET);
+
+ switch (xspi->bytes_per_word) {
+ case 1:
+ data = *(u8 *)(xspi->tx_ptr);
+ break;
+ case 2:
+ data = *(u16 *)(xspi->tx_ptr);
+ break;
+ case 4:
+ data = *(u32 *)(xspi->tx_ptr);
+ break;
+ }
+
+ xspi->write_fn(data, xspi->regs + XSPI_TXD_OFFSET);
xspi->tx_ptr += xspi->bytes_per_word;
}
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
