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Subjectdrivers/net/dsa/sja1105/sja1105_main.c:1608 sja1105_static_config_reload() warn: bitwise AND condition is false here
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4d41ead6ead97c3730bbd186a601a64828668f01
commit: ffe10e679cec9a99f19049459cb27c2fbb1e913a net: dsa: sja1105: Add support for the SGMII port
config: arm-randconfig-m031-20200829 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/net/dsa/sja1105/sja1105_main.c:1608 sja1105_static_config_reload() warn: bitwise AND condition is false here

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ffe10e679cec9a99f19049459cb27c2fbb1e913a
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout ffe10e679cec9a99f19049459cb27c2fbb1e913a
vim +1608 drivers/net/dsa/sja1105/sja1105_main.c

6666cebc5e306f Vladimir Oltean 2019-05-02 1590 for (i = 0; i < SJA1105_NUM_PORTS; i++) {
8400cff60b472c Vladimir Oltean 2019-06-08 1591 rc = sja1105_adjust_port_config(priv, i, speed_mbps[i]);
6666cebc5e306f Vladimir Oltean 2019-05-02 1592 if (rc < 0)
6666cebc5e306f Vladimir Oltean 2019-05-02 1593 goto out;
6666cebc5e306f Vladimir Oltean 2019-05-02 1594 }
ffe10e679cec9a Vladimir Oltean 2020-03-20 1595
ffe10e679cec9a Vladimir Oltean 2020-03-20 1596 if (sja1105_supports_sgmii(priv, SJA1105_SGMII_PORT)) {
ffe10e679cec9a Vladimir Oltean 2020-03-20 1597 bool an_enabled = !!(bmcr & BMCR_ANENABLE);
ffe10e679cec9a Vladimir Oltean 2020-03-20 1598
ffe10e679cec9a Vladimir Oltean 2020-03-20 1599 sja1105_sgmii_pcs_config(priv, an_enabled, false);
ffe10e679cec9a Vladimir Oltean 2020-03-20 1600
ffe10e679cec9a Vladimir Oltean 2020-03-20 1601 if (!an_enabled) {
ffe10e679cec9a Vladimir Oltean 2020-03-20 1602 int speed = SPEED_UNKNOWN;
ffe10e679cec9a Vladimir Oltean 2020-03-20 1603
ffe10e679cec9a Vladimir Oltean 2020-03-20 1604 if (bmcr & BMCR_SPEED1000)
ffe10e679cec9a Vladimir Oltean 2020-03-20 1605 speed = SPEED_1000;
ffe10e679cec9a Vladimir Oltean 2020-03-20 1606 else if (bmcr & BMCR_SPEED100)
ffe10e679cec9a Vladimir Oltean 2020-03-20 1607 speed = SPEED_100;
ffe10e679cec9a Vladimir Oltean 2020-03-20 @1608 else if (bmcr & BMCR_SPEED10)
^^^^^^^^^^^^^^^^^^^
This is an impossible condition. BMCR_SPEED10 is zero.

ffe10e679cec9a Vladimir Oltean 2020-03-20 1609 speed = SPEED_10;
ffe10e679cec9a Vladimir Oltean 2020-03-20 1610
ffe10e679cec9a Vladimir Oltean 2020-03-20 1611 sja1105_sgmii_pcs_force_speed(priv, speed);
ffe10e679cec9a Vladimir Oltean 2020-03-20 1612 }
ffe10e679cec9a Vladimir Oltean 2020-03-20 1613 }
6666cebc5e306f Vladimir Oltean 2019-05-02 1614 out:
af580ae2dcb250 Vladimir Oltean 2019-11-09 1615 mutex_unlock(&priv->mgmt_lock);
af580ae2dcb250 Vladimir Oltean 2019-11-09 1616
6666cebc5e306f Vladimir Oltean 2019-05-02 1617 return rc;
6666cebc5e306f Vladimir Oltean 2019-05-02 1618 }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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