"ret" is an int and "buf" is a u8. sdw_read() returns negative error codes which are truncated to the u8, 0-255 range before being stored as an int. It means that "ret" can't be less than zero.
Fixes: b0a9c37b0178 ("soundwire: Add slave status handling") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 4c345197eb55..ac88031f7664 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -771,12 +771,13 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave) sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
/* Read Instat 1, Instat 2 and Instat 3 registers */ - ret = buf = sdw_read(slave, SDW_SCP_INT1); + ret = sdw_read(slave, SDW_SCP_INT1); if (ret < 0) { dev_err(slave->bus->dev, "SDW_SCP_INT1 read failed:%d", ret); return ret; } + buf = ret;
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2); if (ret < 0) { @@ -870,12 +871,13 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave) * Read status again to ensure no new interrupts arrived * while servicing interrupts. */ - ret = _buf = sdw_read(slave, SDW_SCP_INT1); + ret = sdw_read(slave, SDW_SCP_INT1); if (ret < 0) { dev_err(slave->bus->dev, "SDW_SCP_INT1 read failed:%d", ret); return ret; } + _buf = ret;
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2); if (ret < 0) {