i2c: ismt: initialize DMA buffer

commit bf4169100c909667ede6af67668b3ecce6928343 upstream.

This patch adds code to initialize the DMA buffer to compensate for
possible hardware data corruption.

Signed-off-by: James Ralston <james.d.ralston@intel.com>
[wsa: changed to use 'sizeof']
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
index cd82eb44e4c436a68a9b51ad99e8778a83a7dd56..7c9f053556f2dc8e8d01e69cb02dfd97d0fb076a 100644 (file)
--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -393,6 +393,9 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr,
 
        desc = &priv->hw[priv->head];
 
+       /* Initialize the DMA buffer */
+       memset(priv->dma_buffer, 0, sizeof(priv->dma_buffer));
+
        /* Initialize the descriptor */
        memset(desc, 0, sizeof(struct ismt_desc));
        desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, read_write);