drivers/net/can/m_can/m_can.c:1034 m_can_echo_tx_event() error: uninitialized symbol 'txe'.

drivers/net/can/m_can/m_can.c:1034 m_can_echo_tx_event() error: uninitialized symbol 'txe'.

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 5093 bytes --]

CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Matt Kline <matt@bitbashing.io>
CC: "Marc Kleine-Budde" <mkl@pengutronix.de>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cd8c917a56f20f48748dd43d9ae3caff51d5b987
commit: e39381770ec9ca3c51d8b9bd9cc6e01d78ea974a can: m_can: Disable IRQs on FIFO bus errors
date:   4 months ago
:::::: branch date: 11 hours ago
:::::: commit date: 4 months ago
config: arc-randconfig-m031-20211207 (https://download.01.org/0day-ci/archive/20211207/202112071909.sQoYNqGo-lkp(a)intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0

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/can/m_can/m_can.c:1034 m_can_echo_tx_event() error: uninitialized symbol 'txe'.

Old smatch warnings:
drivers/net/can/m_can/m_can.c:477 m_can_read_fifo() error: uninitialized symbol 'dlc'.
drivers/net/can/m_can/m_can.c:495 m_can_read_fifo() error: uninitialized symbol 'id'.

vim +/txe +1034 drivers/net/can/m_can/m_can.c

1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1002  
e39381770ec9ca Matt Kline          2021-08-16  1003  static int m_can_echo_tx_event(struct net_device *dev)
10c1c3975a6663 Mario Huettel       2017-04-08  1004  {
10c1c3975a6663 Mario Huettel       2017-04-08  1005  	u32 txe_count = 0;
10c1c3975a6663 Mario Huettel       2017-04-08  1006  	u32 m_can_txefs;
10c1c3975a6663 Mario Huettel       2017-04-08  1007  	u32 fgi = 0;
10c1c3975a6663 Mario Huettel       2017-04-08  1008  	int i = 0;
10c1c3975a6663 Mario Huettel       2017-04-08  1009  	unsigned int msg_mark;
10c1c3975a6663 Mario Huettel       2017-04-08  1010  
441ac340169b79 Dan Murphy          2019-05-09  1011  	struct m_can_classdev *cdev = netdev_priv(dev);
10c1c3975a6663 Mario Huettel       2017-04-08  1012  
10c1c3975a6663 Mario Huettel       2017-04-08  1013  	/* read tx event fifo status */
441ac340169b79 Dan Murphy          2019-05-09  1014  	m_can_txefs = m_can_read(cdev, M_CAN_TXEFS);
10c1c3975a6663 Mario Huettel       2017-04-08  1015  
10c1c3975a6663 Mario Huettel       2017-04-08  1016  	/* Get Tx Event fifo element count */
20779943a080c5 Torin Cooper-Bennun 2021-05-04  1017  	txe_count = FIELD_GET(TXEFS_EFFL_MASK, m_can_txefs);
10c1c3975a6663 Mario Huettel       2017-04-08  1018  
10c1c3975a6663 Mario Huettel       2017-04-08  1019  	/* Get and process all sent elements */
10c1c3975a6663 Mario Huettel       2017-04-08  1020  	for (i = 0; i < txe_count; i++) {
1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1021  		u32 txe, timestamp = 0;
e39381770ec9ca Matt Kline          2021-08-16  1022  		int err;
1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1023  
10c1c3975a6663 Mario Huettel       2017-04-08  1024  		/* retrieve get index */
20779943a080c5 Torin Cooper-Bennun 2021-05-04  1025  		fgi = FIELD_GET(TXEFS_EFGI_MASK, m_can_read(cdev, M_CAN_TXEFS));
10c1c3975a6663 Mario Huettel       2017-04-08  1026  
1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1027  		/* get message marker, timestamp */
e39381770ec9ca Matt Kline          2021-08-16  1028  		err = m_can_txe_fifo_read(cdev, fgi, 4, &txe);
e39381770ec9ca Matt Kline          2021-08-16  1029  		if (err) {
e39381770ec9ca Matt Kline          2021-08-16  1030  			netdev_err(dev, "TXE FIFO read returned %d\n", err);
e39381770ec9ca Matt Kline          2021-08-16  1031  			return err;
e39381770ec9ca Matt Kline          2021-08-16  1032  		}
e39381770ec9ca Matt Kline          2021-08-16  1033  
20779943a080c5 Torin Cooper-Bennun 2021-05-04 @1034  		msg_mark = FIELD_GET(TX_EVENT_MM_MASK, txe);
1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1035  		timestamp = FIELD_GET(TX_EVENT_TXTS_MASK, txe);
10c1c3975a6663 Mario Huettel       2017-04-08  1036  
10c1c3975a6663 Mario Huettel       2017-04-08  1037  		/* ack txe element */
20779943a080c5 Torin Cooper-Bennun 2021-05-04  1038  		m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
20779943a080c5 Torin Cooper-Bennun 2021-05-04  1039  							  fgi));
10c1c3975a6663 Mario Huettel       2017-04-08  1040  
10c1c3975a6663 Mario Huettel       2017-04-08  1041  		/* update stats */
1be37d3b0414e3 Torin Cooper-Bennun 2021-03-08  1042  		m_can_tx_update_stats(cdev, msg_mark, timestamp);
10c1c3975a6663 Mario Huettel       2017-04-08  1043  	}
e39381770ec9ca Matt Kline          2021-08-16  1044  
e39381770ec9ca Matt Kline          2021-08-16  1045  	return 0;
10c1c3975a6663 Mario Huettel       2017-04-08  1046  }
10c1c3975a6663 Mario Huettel       2017-04-08  1047  

:::::: The code@line 1034 was first introduced by commit
:::::: 20779943a080c5ac9b9e291b76afbac12fdec023 can: m_can: use bits.h macros for all regmasks

:::::: TO: Torin Cooper-Bennun <torin@maxiluxsystems.com>
:::::: CC: Marc Kleine-Budde <mkl@pengutronix.de>

---
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