linux-kernel - [PATCH] can: pch_can: move setting of errc to before use

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Date:   Thu, 21 Jul 2022 12:15:26 -0400
From:   Tom Rix <trix@...hat.com>
To:     wg@...ndegger.com, mkl@...gutronix.de, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        nathan@...nel.org, ndesaulniers@...gle.com,
        mailhol.vincent@...adoo.fr
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] can: pch_can: move setting of errc to before use

clang build fails with
drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
                cf->data[6] = errc & PCH_TEC;

The commit in the fixes moved the use without moving the setting. So move
the setting of errc to before the use.

Fixes: 3a5c7e4611dd ("can: pch_can: do not report txerr and rxerr during bus-off")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 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;
-- 
2.27.0