From: Wolfram Sang Date: Mon, 23 Mar 2015 08:26:39 +0000 (+0100) Subject: i2c: slave-eeprom: add more info when to increase the pointer X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=98e982b3a29829b676b723e42c1184c87e5242d0;p=linux-beck.git i2c: slave-eeprom: add more info when to increase the pointer It is a bit subtle when to correctly increase the buffer index when reading. Make this clearer by adding some more comments and pointers to the docs. Signed-off-by: Wolfram Sang Acked-by: Uwe Kleine-König Signed-off-by: Wolfram Sang --- 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: