i2c: cpm: Fix i2c_ram structure

[ Upstream commit a2bd970aa62f2f7f80fd0d212b1d4ccea5df4aed ]

the i2c_ram structure is missing the sdmatmp field mentionned in
datasheet for MPC8272 at paragraph 36.5. With this field missing, the
hardware would write past the allocated memory done through
cpm_muram_alloc for the i2c_ram structure and land in memory allocated
for the buffers descriptors corrupting the cbd_bufaddr field. Since this
field is only set during setup(), the first i2c transaction would work
and the following would send data read from an arbitrary memory
location.

Fixes: 61045dbe9d8d ("i2c: Add support for I2C bus on Freescale CPM1/CPM2 controllers")
Signed-off-by: Nicolas VINCENT <nicolas.vincent@vossloh.com>
Acked-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index d89bde2..cf285b9 100644 (file)
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -74,6 +74,9 @@ struct i2c_ram {
        char    res1[4];        /* Reserved */
        ushort  rpbase;         /* Relocation pointer */
        char    res2[2];        /* Reserved */
+       /* The following elements are only for CPM2 */
+       char    res3[4];        /* Reserved */
+       uint    sdmatmp;        /* Internal */
 };
 
 #define I2COM_START    0x80