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-rw-r--r--drivers/i2c/i2c-slave-eeprom.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-slave-eeprom.c b/drivers/i2c/i2c-slave-eeprom.c
index 3fb45d894d80..822374654609 100644
--- a/drivers/i2c/i2c-slave-eeprom.c
+++ b/drivers/i2c/i2c-slave-eeprom.c
@@ -48,12 +48,18 @@ static int i2c_slave_eeprom_slave_cb(struct i2c_client *client,
break;
case I2C_SLAVE_READ_PROCESSED:
+ /* The previous byte made it to the bus, get next one */
eeprom->buffer_idx++;
/* fallthrough */
case I2C_SLAVE_READ_REQUESTED:
spin_lock(&eeprom->buffer_lock);
*val = eeprom->buffer[eeprom->buffer_idx];
spin_unlock(&eeprom->buffer_lock);
+ /*
+ * Do not increment buffer_idx here, because we don't know if
+ * this byte will be actually used. Read Linux I2C slave docs
+ * for details.
+ */
break;
case I2C_SLAVE_STOP:

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