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soundwire: Fix a signedness bug

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"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: b0a9c37b01 ("soundwire: Add slave status handling")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-01-21 10:26:31 +05:30 committed by Greg Kroah-Hartman
parent d6088e9a89
commit 51c266561e
1 changed files with 2 additions and 2 deletions
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4
drivers/soundwire/bus.c
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@ -771,7 +771,7 @@ 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);
buf = ret = sdw_read(slave, SDW_SCP_INT1);
if (ret < 0) {
dev_err(slave->bus->dev,
"SDW_SCP_INT1 read failed:%d", ret);
@ -870,7 +870,7 @@ 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);
_buf = ret = sdw_read(slave, SDW_SCP_INT1);
if (ret < 0) {
dev_err(slave->bus->dev,
"SDW_SCP_INT1 read failed:%d", ret);