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Date: Tue, 4 Jun 2024 12:44:17 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev,
Martin Hundebøll <martin@...nix.com>,
Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
Markus Schneider-Pargmann <msp@...libre.com>,
Martin Hundebøll <martin@...nix.com>,
linux-can@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] can: m_can: don't enable transceiver when probing
Hi Martin,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Martin-Hundeb-ll/can-m_can-don-t-enable-transceiver-when-probing/20240530-185906
base: https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git testing
patch link: https://lore.kernel.org/r/20240530105801.3930087-1-martin%40geanix.com
patch subject: [PATCH v3] can: m_can: don't enable transceiver when probing
config: i386-randconfig-r081-20240603 (https://download.01.org/0day-ci/archive/20240603/202406031513.ByfTbHww-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202406031513.ByfTbHww-lkp@intel.com/
New smatch warnings:
drivers/net/can/m_can/m_can.c:1725 m_can_dev_setup() error: uninitialized symbol 'err'.
vim +/err +1725 drivers/net/can/m_can/m_can.c
3b464affd89821 Marc Kleine-Budde 2020-12-12 1671 static int m_can_dev_setup(struct m_can_classdev *cdev)
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1672 {
3b464affd89821 Marc Kleine-Budde 2020-12-12 1673 struct net_device *dev = cdev->net;
e96c73eab56aed Martin Hundebøll 2024-05-30 1674 int m_can_version, err, niso;
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1675
3b464affd89821 Marc Kleine-Budde 2020-12-12 1676 m_can_version = m_can_check_core_release(cdev);
b03cfc5bb0e11f Mario Huettel 2017-04-08 1677 /* return if unsupported version */
b03cfc5bb0e11f Mario Huettel 2017-04-08 1678 if (!m_can_version) {
3b464affd89821 Marc Kleine-Budde 2020-12-12 1679 dev_err(cdev->dev, "Unsupported version number: %2d",
5e520edd91f0cd Faiz Abbas 2018-01-16 1680 m_can_version);
5e520edd91f0cd Faiz Abbas 2018-01-16 1681 return -EINVAL;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1682 }
b03cfc5bb0e11f Mario Huettel 2017-04-08 1683
3b464affd89821 Marc Kleine-Budde 2020-12-12 1684 if (!cdev->is_peripheral)
b48b89f9c189d2 Jakub Kicinski 2022-09-27 1685 netif_napi_add(dev, &cdev->napi, m_can_poll);
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1686
b03cfc5bb0e11f Mario Huettel 2017-04-08 1687 /* Shared properties of all M_CAN versions */
3b464affd89821 Marc Kleine-Budde 2020-12-12 1688 cdev->version = m_can_version;
3b464affd89821 Marc Kleine-Budde 2020-12-12 1689 cdev->can.do_set_mode = m_can_set_mode;
3b464affd89821 Marc Kleine-Budde 2020-12-12 1690 cdev->can.do_get_berr_counter = m_can_get_berr_counter;
6cfda7fbebe8a4 Oliver Hartkopp 2015-01-05 1691
b03cfc5bb0e11f Mario Huettel 2017-04-08 1692 /* Set M_CAN supported operations */
3b464affd89821 Marc Kleine-Budde 2020-12-12 1693 cdev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1694 CAN_CTRLMODE_LISTENONLY |
80646733f11c2e Dong Aisheng 2014-11-18 1695 CAN_CTRLMODE_BERR_REPORTING |
fb7d6a81c22017 Pankaj Sharma 2019-10-21 1696 CAN_CTRLMODE_FD |
fb7d6a81c22017 Pankaj Sharma 2019-10-21 1697 CAN_CTRLMODE_ONE_SHOT;
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1698
b03cfc5bb0e11f Mario Huettel 2017-04-08 1699 /* Set properties depending on M_CAN version */
3b464affd89821 Marc Kleine-Budde 2020-12-12 1700 switch (cdev->version) {
b03cfc5bb0e11f Mario Huettel 2017-04-08 1701 case 30:
b03cfc5bb0e11f Mario Huettel 2017-04-08 1702 /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1703 err = can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1704 if (err)
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1705 return err;
d6da7881020f9b Jarkko Nikula 2022-05-12 1706 cdev->can.bittiming_const = &m_can_bittiming_const_30X;
d6da7881020f9b Jarkko Nikula 2022-05-12 1707 cdev->can.data_bittiming_const = &m_can_data_bittiming_const_30X;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1708 break;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1709 case 31:
b03cfc5bb0e11f Mario Huettel 2017-04-08 1710 /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1711 err = can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1712 if (err)
7d4a101c0bd3c6 Vincent Mailhol 2021-12-14 1713 return err;
d6da7881020f9b Jarkko Nikula 2022-05-12 1714 cdev->can.bittiming_const = &m_can_bittiming_const_31X;
d6da7881020f9b Jarkko Nikula 2022-05-12 1715 cdev->can.data_bittiming_const = &m_can_data_bittiming_const_31X;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1716 break;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1717 case 32:
5c7d55bded77da Pankaj Sharma 2020-11-26 1718 case 33:
5c7d55bded77da Pankaj Sharma 2020-11-26 1719 /* Support both MCAN version v3.2.x and v3.3.0 */
d6da7881020f9b Jarkko Nikula 2022-05-12 1720 cdev->can.bittiming_const = &m_can_bittiming_const_31X;
d6da7881020f9b Jarkko Nikula 2022-05-12 1721 cdev->can.data_bittiming_const = &m_can_data_bittiming_const_31X;
f524f829b75a7d Dan Murphy 2019-05-09 1722
e96c73eab56aed Martin Hundebøll 2024-05-30 1723 niso = m_can_niso_supported(cdev);
e96c73eab56aed Martin Hundebøll 2024-05-30 1724 if (niso < 0)
e96c73eab56aed Martin Hundebøll 2024-05-30 @1725 return err;
s/err/niso/
e96c73eab56aed Martin Hundebøll 2024-05-30 1726 if (niso)
e96c73eab56aed Martin Hundebøll 2024-05-30 1727 cdev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1728 break;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1729 default:
3b464affd89821 Marc Kleine-Budde 2020-12-12 1730 dev_err(cdev->dev, "Unsupported version number: %2d",
3b464affd89821 Marc Kleine-Budde 2020-12-12 1731 cdev->version);
5e520edd91f0cd Faiz Abbas 2018-01-16 1732 return -EINVAL;
b03cfc5bb0e11f Mario Huettel 2017-04-08 1733 }
b03cfc5bb0e11f Mario Huettel 2017-04-08 1734
e96c73eab56aed Martin Hundebøll 2024-05-30 1735 /* Forcing standby mode should be redunant, as the chip should be in
e96c73eab56aed Martin Hundebøll 2024-05-30 1736 * standby after a reset. Write the INIT bit anyways, should the chip
e96c73eab56aed Martin Hundebøll 2024-05-30 1737 * be configured by previous stage.
e96c73eab56aed Martin Hundebøll 2024-05-30 1738 */
e96c73eab56aed Martin Hundebøll 2024-05-30 1739 return m_can_cccr_update_bits(cdev, CCCR_INIT, CCCR_INIT);
e0d1f4816f2a7e Dong Aisheng 2014-07-16 1740 }
--
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