From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
To: Nathan Chancellor <nathan@kernel.org>, linux-can@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
kernel@pengutronix.de, "Marc Kleine-Budde" <mkl@pengutronix.de>,
"Frank Jungclaus" <frank.jungclaus@esd.eu>,
"Stefan Mätje" <Stefan.Maetje@esd.eu>,
"Vincent Mailhol" <mailhol.vincent@wanadoo.fr>
Subject: [PATCH] can: pch_can: initialize errc before using it
Date: Fri, 22 Jul 2022 01:00:32 +0900 [thread overview]
Message-ID: <20220721160032.9348-1-mailhol.vincent@wanadoo.fr> (raw)
In-Reply-To: <YtlwSpoeT+nhmhVn@dev-arch.thelio-3990X>
After commit 3a5c7e4611dd, the variable errc is accessed before being
initialized, c.f. below W=2 warning:
| In function 'pch_can_error',
| inlined from 'pch_can_poll' at drivers/net/can/pch_can.c:739:4:
| drivers/net/can/pch_can.c:501:29: warning: 'errc' may be used uninitialized [-Wmaybe-uninitialized]
| 501 | cf->data[6] = errc & PCH_TEC;
| | ^
| drivers/net/can/pch_can.c: In function 'pch_can_poll':
| drivers/net/can/pch_can.c:484:13: note: 'errc' was declared here
| 484 | u32 errc, lec;
| | ^~~~
Moving errc initialization up solves this issue.
Fixes: 3a5c7e4611dd ("can: pch_can: do not report txerr and rxerr during bus-off")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
drivers/net/can/pch_can.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 50f6719b3aa4..32804fed116c 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -489,6 +489,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
if (!skb)
return;
+ errc = ioread32(&priv->regs->errc);
if (status & PCH_BUS_OFF) {
pch_can_set_tx_all(priv, 0);
pch_can_set_rx_all(priv, 0);
@@ -502,7 +503,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
cf->data[7] = (errc & PCH_REC) >> 8;
}
- errc = ioread32(&priv->regs->errc);
/* Warning interrupt. */
if (status & PCH_EWARN) {
state = CAN_STATE_ERROR_WARNING;
--
2.35.1
next prev parent reply other threads:[~2022-07-21 16:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-20 8:10 [PATCH net-next 0/29] pull-request: can-next 2022-07-20 Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 01/29] can: slcan: use scnprintf() as a hardening measure Marc Kleine-Budde
2022-07-20 9:30 ` patchwork-bot+netdevbpf
2022-07-20 8:10 ` [PATCH net-next 02/29] can: slcan: convert comments to network style comments Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 03/29] can: slcan: slcan_init() convert printk(LEVEL ...) to pr_level() Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 04/29] can: slcan: fix whitespace issues Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 05/29] can: slcan: convert comparison to NULL into !val Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 06/29] can: slcan: clean up if/else Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 07/29] dt-bindings: can: sja1000: Convert to json-schema Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 08/29] dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 09/29] can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 10/29] can: sja1000: Use device_get_match_data to get device data Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 11/29] can: sja1000: Change the return type as void for SoC specific init Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 12/29] can: slcan: do not sleep with a spin lock held Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 13/29] can: c_can: remove wrong comment Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 14/29] can: ctucanfd: Update CTU CAN FD IP core registers to match version 3.x Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 15/29] can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 16/29] can: peak_usb: correction of an initially misnamed field name Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 17/29] can: peak_usb: include support for a new MCU Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off Marc Kleine-Budde
2022-07-21 15:27 ` Nathan Chancellor
2022-07-21 15:47 ` Marc Kleine-Budde
2022-07-21 16:11 ` Vincent MAILHOL
2022-07-21 16:20 ` Nathan Chancellor
2022-07-21 16:51 ` Jakub Kicinski
2022-07-21 16:00 ` Vincent Mailhol [this message]
2022-07-21 16:02 ` [PATCH] can: pch_can: initialize errc before using it Nathan Chancellor
2022-07-20 8:10 ` [PATCH net-next 19/29] can: rcar_can: do not report txerr and rxerr during bus-off Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 20/29] can: sja1000: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 21/29] can: slcan: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 22/29] can: hi311x: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 23/29] can: sun4i_can: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 24/29] can: kvaser_usb_hydra: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 25/29] can: kvaser_usb_leaf: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 26/29] can: usb_8dev: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 27/29] can: error: specify the values of data[5..7] of CAN error frames Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 28/29] can: add CAN_ERR_CNT flag to notify availability of error counter Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 29/29] can: error: add definitions for the different CAN error thresholds Marc Kleine-Budde
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