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can: pch_can: pch_can_error(): initialize errc before using it

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[ Upstream commit 9950f11211 ]

After commit 3a5c7e4611, 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: 3a5c7e4611 ("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>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/all/20220721160032.9348-1-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vincent Mailhol 2022-07-22 01:00:32 +09:00 committed by Greg Kroah-Hartman
parent f60fa2510a
commit 502ce72430
1 changed files with 1 additions and 1 deletions
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2
drivers/net/can/pch_can.c
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@ -500,6 +500,7 @@ 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);
@ -512,7 +513,6 @@ 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;