linux-kernel - [PATCH 3.10 45/54] i2c: ismt: initialize DMA buffer

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Message-Id: <20131101220216.375967005@linuxfoundation.org>
Date:	Fri,  1 Nov 2013 15:04:13 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, James Ralston <james.d.ralston@...el.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Jean Delvare <jdelvare@...e.de>
Subject: [PATCH 3.10 45/54] i2c: ismt: initialize DMA buffer

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Ralston <james.d.ralston@...el.com>

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@...el.com>
[wsa: changed to use 'sizeof']
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Cc: Jean Delvare <jdelvare@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-ismt.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -393,6 +393,9 @@ static int ismt_access(struct i2c_adapte
 
 	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);


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