@@ -1079,7 +1079,7 @@ static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
struct rcar_canfd_global *gpriv = dev_id;
struct net_device *ndev;
struct rcar_canfd_channel *priv;
- u32 sts, gerfl;
+ u32 sts, cc, gerfl;
u32 ch, ridx;
/* Global error interrupts still indicate a condition specific
@@ -1097,7 +1097,9 @@ static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
/* Handle Rx interrupts */
sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(ridx));
- if (likely(sts & RCANFD_RFSTS_RFIF)) {
+ cc = rcar_canfd_read(priv->base, RCANFD_RFCC(ridx));
+ if (likely(sts & RCANFD_RFSTS_RFIF &&
+ cc & RCANFD_RFCC_RFIE)) {
if (napi_schedule_prep(&priv->napi)) {
/* Disable Rx FIFO interrupts */
rcar_canfd_clear_bit(priv->base,
commit 702de2c21eed04c67cefaaedc248ef16e5f6b293 upstream. We are seeing an IRQ storm on the global receive IRQ line under heavy CAN bus load conditions with both CAN channels enabled. Conditions: The global receive IRQ line is shared between can0 and can1, either of the channels can trigger interrupt while the other channel's IRQ line is disabled (RFIE). When global a receive IRQ interrupt occurs, we mask the interrupt in the IRQ handler. Clearing and unmasking of the interrupt is happening in rx_poll(). There is a race condition where rx_poll() unmasks the interrupt, but the next IRQ handler does not mask the IRQ due to NAPIF_STATE_MISSED flag (e.g.: can0 RX FIFO interrupt is disabled and can1 is triggering RX interrupt, the delay in rx_poll() processing results in setting NAPIF_STATE_MISSED flag) leading to an IRQ storm. This patch fixes the issue by checking IRQ active and enabled before handling the IRQ on a particular channel. Fixes: dd3bd23eb438 ("can: rcar_canfd: Add Renesas R-Car CAN FD driver") Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://lore.kernel.org/all/20221025155657.1426948-2-biju.das.jz@bp.renesas.com Cc: stable@vger.kernel.org # 4.14.y [mkl: adjust commit message] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> [biju: removed gpriv from RCANFD_RFCC_RFIE macro] Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- Resending to 4.14 with confilcts[1] fixed [1] https://lore.kernel.org/stable/1667194208232105@kroah.com/T/#u --- drivers/net/can/rcar/rcar_canfd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)