Biju Das f4efec2a3d can: rcar_canfd: rcar_canfd_handle_global_receive(): fix IRQ storm on global FIFO receive ... commit 702de2c21e 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: dd3bd23eb4 ("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 [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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-04-19 17:55:54 +08:00
..
c_can	can: c_can: don't cache TX messages for C_CAN cores	2023-04-19 17:54:09 +08:00
cc770
dev	can: netlink: allow configuring of fixed data bit rates without need for do_set_data_bittiming callback	2023-04-19 17:52:18 +08:00
ifi_canfd
m_can
mscan	can: mscan: mpc5xxx: mpc5xxx_can_probe(): add missing put_clock() in error path	2023-04-19 17:55:51 +08:00
peak_canfd
rcar	can: rcar_canfd: rcar_canfd_handle_global_receive(): fix IRQ storm on global FIFO receive	2023-04-19 17:55:54 +08:00
sja1000	can: sja1000: do not report txerr and rxerr during bus-off	2023-04-19 17:52:25 +08:00
softing
spi	can: mcp251x: mcp251x_can_probe(): add missing unregister_candev() in error path	2023-04-19 17:55:51 +08:00
usb	can: kvaser_usb: Fix possible completions during init_completion	2023-04-19 17:55:45 +08:00
at91_can.c
flexcan.c	can: flexcan: flexcan_mailbox_read() fix return value for drop = true	2023-04-19 17:54:00 +08:00
grcan.c
ipms_canfd.c
janz-ican3.c
Kconfig
kvaser_pciefd.c
led.c
Makefile
pch_can.c	can: pch_can: pch_can_error(): initialize errc before using it	2023-04-19 17:52:25 +08:00
slcan.c
sun4i_can.c	can: sun4i_can: do not report txerr and rxerr during bus-off	2023-04-19 17:52:25 +08:00
ti_hecc.c
vcan.c
vxcan.c
xilinx_can.c	Revert "can: xilinx_can: Limit CANFD brp to 2"	2023-04-19 17:51:26 +08:00