i2c-i801: Don't use the block buffer for I2C block writes

Experience has shown that the block buffer can only be used for SMBus
(not I2C) block transactions, even though the datasheet doesn't
mention this limitation.

Reported-by: Felix Rubinstein <felixru@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Oleg Ryjkov <oryjkov@gmail.com>
Cc: stable@kernel.org

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 9da5b05cdb52..299b918455a3 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -416,9 +416,11 @@ static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
                 data->block[0] = 32;    /* max for SMBus block reads */
         }
 
+        /* Experience has shown that the block buffer can only be used for
+           SMBus (not I2C) block transactions, even though the datasheet
+           doesn't mention this limitation. */
         if ((i801_features & FEATURE_BLOCK_BUFFER)
-         && !(command == I2C_SMBUS_I2C_BLOCK_DATA
-              && read_write == I2C_SMBUS_READ)
+         && command != I2C_SMBUS_I2C_BLOCK_DATA
          && i801_set_block_buffer_mode() == 0)
                 result = i801_block_transaction_by_block(data, read_write,
                                                          hwpec);