Hi All,
I will send patch to 4.9 stable after fixing the conflicts.
Similar for other failed patches.
Cheers,
Biju
> Subject: FAILED: patch "[PATCH] can: rcar_canfd:
> rcar_canfd_handle_global_receive(): fix IRQ" failed to apply to 4.9-
> stable tree
>
>
> The patch below does not apply to the 4.9-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git
> commit id to <stable@xxxxxxxxxxxxxxx>.
>
> Possible dependencies:
>
> 702de2c21eed ("can: rcar_canfd: rcar_canfd_handle_global_receive():
> fix IRQ storm on global FIFO receive") 45721c406dcf ("can: rcar_canfd:
> Add support for r8a779a0 SoC")
> 76e9353a80e9 ("can: rcar_canfd: Add support for RZ/G2L family")
> 13dfb3fa4943 ("Merge
> git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From 702de2c21eed04c67cefaaedc248ef16e5f6b293 Mon Sep 17 00:00:00 2001
> From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> Date: Tue, 25 Oct 2022 16:56:55 +0100
> Subject: [PATCH] can: rcar_canfd: rcar_canfd_handle_global_receive():
> fix IRQ storm on global FIFO receive
>
> 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@xxxxxxxxxxxxxx>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> Link:
> Cc: stable@xxxxxxxxxxxxxxx
> [mkl: adjust commit message]
> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
>
> diff --git a/drivers/net/can/rcar/rcar_canfd.c
> b/drivers/net/can/rcar/rcar_canfd.c
> index 567620d215f8..ea828c1bd3a1 100644
> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -1157,11 +1157,13 @@ static void
> rcar_canfd_handle_global_receive(struct rcar_canfd_global *gpriv, u3
> {
> struct rcar_canfd_channel *priv = gpriv->ch[ch];
> u32 ridx = ch + RCANFD_RFFIFO_IDX;
> - u32 sts;
> + u32 sts, cc;
>
> /* Handle Rx interrupts */
> sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(gpriv, ridx));
> - if (likely(sts & RCANFD_RFSTS_RFIF)) {
> + cc = rcar_canfd_read(priv->base, RCANFD_RFCC(gpriv, 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,
