From: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com
If the driver was not opened, rcar_can_suspend() should not call clk_disable() because the clock was not enabled.
Fixes: fd1159318e55 ("can: add Renesas R-Car CAN driver") Link: https://lore.kernel.org/all/20210924075556.223685-1-yoshihiro.shimoda.uh@ren... Cc: stable@vger.kernel.org Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Tested-by: Ayumi Nakamichi ayumi.nakamichi.kf@renesas.com Reviewed-by: Ulrich Hecht uli+renesas@fpond.eu Tested-by: Biju Das biju.das.jz@bp.renesas.com Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- drivers/net/can/rcar/rcar_can.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c index 00e4533c8bdd..8999ec9455ec 100644 --- a/drivers/net/can/rcar/rcar_can.c +++ b/drivers/net/can/rcar/rcar_can.c @@ -846,10 +846,12 @@ static int __maybe_unused rcar_can_suspend(struct device *dev) struct rcar_can_priv *priv = netdev_priv(ndev); u16 ctlr;
- if (netif_running(ndev)) { - netif_stop_queue(ndev); - netif_device_detach(ndev); - } + if (!netif_running(ndev)) + return 0; + + netif_stop_queue(ndev); + netif_device_detach(ndev); + ctlr = readw(&priv->regs->ctlr); ctlr |= RCAR_CAN_CTLR_CANM_HALT; writew(ctlr, &priv->regs->ctlr); @@ -868,6 +870,9 @@ static int __maybe_unused rcar_can_resume(struct device *dev) u16 ctlr; int err;
+ if (!netif_running(ndev)) + return 0; + err = clk_enable(priv->clk); if (err) { netdev_err(ndev, "clk_enable() failed, error %d\n", err); @@ -881,10 +886,9 @@ static int __maybe_unused rcar_can_resume(struct device *dev) writew(ctlr, &priv->regs->ctlr); priv->can.state = CAN_STATE_ERROR_ACTIVE;
- if (netif_running(ndev)) { - netif_device_attach(ndev); - netif_start_queue(ndev); - } + netif_device_attach(ndev); + netif_start_queue(ndev); + return 0; }