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Message-ID: <202509050259.NjPdQyAD-lkp@intel.com>
Date: Fri, 5 Sep 2025 02:46:11 +0800
From: kernel test robot <lkp@...el.com>
To: Vincent Mailhol <mailhol@...nel.org>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Oliver Hartkopp <socketcan@...tkopp.net>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Vincent Mailhol <mailhol@...nel.org>,
Stéphane Grosjean <stephane.grosjean@...-networks.com>,
Robert Nawrath <mbro1689@...il.com>,
Minh Le <minh.le.aj@...esas.com>,
Duy Nguyen <duy.nguyen.rh@...esas.com>, linux-can@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/21] can: netlink: add can_validate_databittiming()
Hi Vincent,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 2fd4161d0d2547650d9559d57fc67b4e0a26a9e3]
url: https://github.com/intel-lab-lkp/linux/commits/Vincent-Mailhol/can-dev-move-struct-data_bittiming_params-to-linux-can-bittiming-h/20250903-170807
base: 2fd4161d0d2547650d9559d57fc67b4e0a26a9e3
patch link: https://lore.kernel.org/r/20250903-canxl-netlink-prep-v1-6-904bd6037cd9%40kernel.org
patch subject: [PATCH 06/21] can: netlink: add can_validate_databittiming()
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20250905/202509050259.NjPdQyAD-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250905/202509050259.NjPdQyAD-lkp@intel.com/reproduce)
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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509050259.NjPdQyAD-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/net/can/dev/netlink.c:111:6: warning: variable 'is_on' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
111 | if (ifla_can_data_bittiming == IFLA_CAN_DATA_BITTIMING) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/can/dev/netlink.c:119:6: note: uninitialized use occurs here
119 | if (is_on) {
| ^~~~~
drivers/net/can/dev/netlink.c:111:2: note: remove the 'if' if its condition is always true
111 | if (ifla_can_data_bittiming == IFLA_CAN_DATA_BITTIMING) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
112 | data_tdc = data[IFLA_CAN_TDC];
113 | tdc_flags = flags & CAN_CTRLMODE_FD_TDC_MASK;
114 | is_on = flags & CAN_CTRLMODE_FD;
115 | } else {
| ~~~~~~
116 | WARN_ON(1); /* Place holder for CAN XL */
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
117 | }
| ~
drivers/net/can/dev/netlink.c:108:12: note: initialize the variable 'is_on' to silence this warning
108 | bool is_on;
| ^
| = 0
1 warning generated.
vim +111 drivers/net/can/dev/netlink.c
101
102 static int can_validate_databittiming(struct nlattr *data[],
103 struct netlink_ext_ack *extack,
104 int ifla_can_data_bittiming, u32 flags)
105 {
106 struct nlattr *data_tdc;
107 u32 tdc_flags;
108 bool is_on;
109 int err;
110
> 111 if (ifla_can_data_bittiming == IFLA_CAN_DATA_BITTIMING) {
112 data_tdc = data[IFLA_CAN_TDC];
113 tdc_flags = flags & CAN_CTRLMODE_FD_TDC_MASK;
114 is_on = flags & CAN_CTRLMODE_FD;
115 } else {
116 WARN_ON(1); /* Place holder for CAN XL */
117 }
118
119 if (is_on) {
120 if (!data[IFLA_CAN_BITTIMING] || !data[ifla_can_data_bittiming])
121 return -EOPNOTSUPP;
122 }
123
124 if (data[ifla_can_data_bittiming] || data_tdc) {
125 if (!is_on)
126 return -EOPNOTSUPP;
127 }
128
129 err = can_validate_bittiming(data, extack, ifla_can_data_bittiming);
130 if (err)
131 return err;
132
133 err = can_validate_tdc(data_tdc, extack, tdc_flags);
134 if (err)
135 return err;
136
137 return 0;
138 }
139
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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