i2cdump: don't read block data in non-block modes

We currently read data twice in byte mode. Add a check to avoid calling
i2c_smbus_read_i2c_block_data() if we're not in I2C or SMBus block mode.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c
index 907d738fd..094bf9e38 100644
--- a/miscutils/i2c_tools.c
+++ b/miscutils/i2c_tools.c
@@ -971,7 +971,8 @@ int i2cdump_main(int argc UNUSED_PARAM, char **argv)
 
         /* All but word data. */
         if (mode != I2C_SMBUS_WORD_DATA || even) {
-                blen = read_block_data(fd, mode, block);
+                if (mode == I2C_SMBUS_BLOCK_DATA || mode == I2C_SMBUS_I2C_BLOCK_DATA)
+                        blen = read_block_data(fd, mode, block);
 
                 if (mode == I2C_SMBUS_BYTE) {
                         res = i2c_smbus_write_byte(fd, first);