superrob1500
/
mirror-linux
mirror of https://github.com/torvalds/linux
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
mirror-linux/drivers/misc
History
Xiaolei Wang 3677041715 misc: rp1: Send IACK on IRQ activate to fix kdump/kexec 
After a kexec/kdump reboot, the macb Ethernet controller fails to
receive any packets, causing DHCP to hang indefinitely and the network
interface to be unusable despite link being up.

The root cause is that RP1's level-triggered MSI-X interrupt sources
(such as macb on hwirq 6) may have their internal state machines stuck
in the "waiting for IACK" state. This happens because the previous
kernel crashed before sending the acknowledgment for a pending level
interrupt.

In this stuck state, RP1 will not generate new MSI-X writes even though
the interrupt source remains asserted. Since no new MSI-X is sent, the
GIC never sees a new edge, the chained IRQ handler is never invoked,
and the interrupt is permanently lost.

Fix this by sending MSIX_CFG_IACK in rp1_irq_activate(). This
unconditionally resets the MSI-X state machine back to idle when a
child device requests its interrupt. If the interrupt source is still
asserted, RP1 will immediately issue a new MSI-X with the freshly
configured msg_addr/msg_data, and normal interrupt delivery resumes.

Writing IACK when the state machine is already idle (i.e., on a normal
cold boot) is harmless — it has no effect.

Fixes: 49d63971f9 ("misc: rp1: RaspberryPi RP1 misc driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Link: https://patch.msgid.link/20260518073405.2115003-1-xiaolei.wang@windriver.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2026-05-22 12:19:02 +02:00
..
altera-stapl Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
amd-sbi misc: amd-sbi: Add device tree mapping for AMD SBRMI devices 2026-04-02 16:17:29 +02:00
bcm-vk Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
c2port Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cardreader Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cb710 misc: cb710: Fix a NULL vs IS_ERR() check in probe() 2025-11-26 15:09:34 +01:00
eeprom Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
genwqe Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
ibmasm ibmasm: fix heap over-read in ibmasm_send_i2o_message() 2026-04-02 16:31:02 +02:00
keba Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
lis3lv02d lis3lv02d: Omit IRQF_ONESHOT if no threaded handler is provided 2026-04-01 10:19:43 +02:00
lkdtm lkdtm/fortify: Drop unneeded FORTIFY_STR_OBJECT test 2026-03-31 16:53:47 -07:00
mchp_pci1xxxx Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
mei mei: me: add nova lake point H DID 2026-04-06 11:40:38 +02:00
ocxl Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pvpanic
…
rp1 misc: rp1: Send IACK on IRQ activate to fix kdump/kexec 2026-05-22 12:19:02 +02:00
sgi-gru mm: rename zap_vma_ptes() to zap_special_vma_range() 2026-04-05 13:53:15 -07:00
sgi-xp Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
uacce Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vmw_vmci misc: vmw_vmci: Fix spelling mistakes in comments 2026-04-02 17:06:00 +02:00
Kconfig misc: ti_fpc202: Support special-purpose GPIO lines with LED features 2026-04-02 16:29:27 +02:00
Makefile char: misc: Move drivers/misc/misc_minor_kunit.c to drivers/char/ 2025-08-19 12:41:17 +02:00
ad525x_dpot-i2c.c
…
ad525x_dpot-spi.c
…
ad525x_dpot.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ad525x_dpot.h
…
apds990x.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
apds9802als.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
atmel-ssc.c Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
bh1770glc.c misc: bh1770glc: use pm_runtime_resume_and_get() in power_state_store 2025-11-26 15:09:37 +01:00
cs5535-mfgpt.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ds1682.c sysfs: treewide: switch back to bin_attribute::read()/write() 2025-06-17 10:44:13 +02:00
dummy-irq.c
…
dw-xdata-pcie.c dw-xdata: Use str_write_read() in dw_xdata_start() and dw_xdata_perf() 2025-09-06 15:59:39 +02:00
enclosure.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
fastrpc.c misc: fastrpc: check qcom_scm_assign_mem() return in rpmsg_probe 2026-04-02 14:42:19 +02:00
gehc-achc.c
…
hi6421v600-irq.c misc: Use dev_fwnode() 2025-06-24 16:45:08 +01:00
hisi_hikey_usb.c misc: hisi_hikey_usb: Use str_enabled_disabled() in hub_power_ctrl() 2025-08-19 12:37:15 +02:00
hmc6352.c
…
hpilo.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hpilo.h
…
ibmvmc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ibmvmc.h
…
ics932s401.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
isl29003.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
isl29020.c misc: isl29020: Fix the wrong format specifier 2024-11-12 12:54:53 +01:00
kgdbts.c Char/Misc/IIO driver changes for 7.0-rc1 2026-02-17 09:11:04 -08:00
lan966x_pci.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
lan966x_pci.dtso
…
lattice-ecp3-config.c
…
mrvl_cn10k_dpi.c
…
nsm.c
…
ntsync.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
open-dice.c misc: open-dice: replace deprecated mmap hook with mmap_prepare 2026-04-05 13:53:43 -07:00
pch_phub.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_endpoint_test.c selftests: pci_endpoint: Skip BAR subrange test on -ENOSPC 2026-04-08 14:41:39 -05:00
phantom.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
qcom-coincell.c
…
rpmb-core.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
smpro-errmon.c
…
smpro-misc.c
…
sram-exec.c
…
sram.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sram.h
…
ti_fpc202.c misc: ti_fpc202: Support special-purpose GPIO lines with LED features 2026-04-02 16:29:27 +02:00
tifm_7xx1.c
…
tifm_core.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tps6594-esm.c Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
tps6594-pfsm.c misc: tps6594-pfsm: Add TI TPS652G1 PMIC PFSM 2025-07-10 09:58:06 +01:00
tsl2550.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vcpu_stall_detector.c misc: vcpu_stall_detector: Switch to use hrtimer_setup() 2025-02-18 11:19:04 +01:00
vmw_balloon.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
xilinx_sdfec.c Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
xilinx_tmr_inject.c Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
xilinx_tmr_manager.c
…