Lukas Wunner 3b4c966fb1 PCI: pciehp: Fix infinite loop in IRQ handler upon power fault ... commit 23584c1ed3 upstream. The Power Fault Detected bit in the Slot Status register differs from all other hotplug events in that it is sticky: It can only be cleared after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8: If a power controller detects a main power fault on the hot-plug slot, it must automatically set its internal main power fault latch [...]. The main power fault latch is cleared when software turns off power to the hot-plug slot. The stickiness used to cause interrupt storms and infinite loops which were fixed in 2009 by commits 5651c48cfa ("PCI pciehp: fix power fault interrupt storm problem") and 99f0169c17 ("PCI: pciehp: enable software notification on empty slots"). Unfortunately in 2020 the infinite loop issue was inadvertently reintroduced by commit 8edf5332c3 ("PCI: pciehp: Fix MSI interrupt race"): The hardirq handler pciehp_isr() clears the PFD bit until pciehp's power_fault_detected flag is set. That happens in the IRQ thread pciehp_ist(), which never learns of the event because the hardirq handler is stuck in an infinite loop. Fix by setting the power_fault_detected flag already in the hardirq handler. Link: https://bugzilla.kernel.org/show_bug.cgi?id=214989 Link: https://lore.kernel.org/linux-pci/DM8PR11MB5702255A6A92F735D90A4446868B9@DM8PR11MB5702.namprd11.prod.outlook.com Fixes: 8edf5332c3 ("PCI: pciehp: Fix MSI interrupt race") Link: https://lore.kernel.org/r/66eaeef31d4997ceea357ad93259f290ededecfd.1637187226.git.lukas@wunner.de Reported-by: Joseph Bao <joseph.bao@intel.com> Tested-by: Joseph Bao <joseph.bao@intel.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org # v4.19+ Cc: Stuart Hayes <stuart.w.hayes@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-02-05 12:37:54 +01:00
..
controller	PCI: pci-bridge-emul: Correctly set PCIe capabilities	2022-01-27 10:54:26 +01:00
endpoint	PCI: endpoint: Fix missing destroy_workqueue()	2021-05-19 10:13:02 +02:00
hotplug	PCI: pciehp: Fix infinite loop in IRQ handler upon power fault	2022-02-05 12:37:54 +01:00
pcie	PCI/portdrv: Enable Bandwidth Notification only if port supports it	2021-09-18 13:40:10 +02:00
switch
access.c
ats.c
bus.c
ecam.c
host-bridge.c
iov.c
irq.c
Kconfig
Makefile
mmap.c
msi.c	PCI/MSI: Fix pci_irq_vector()/pci_irq_get_affinity()	2022-01-27 10:54:06 +01:00
of.c	PCI: of: Don't fail devm_pci_alloc_host_bridge() on missing 'ranges'	2021-09-22 12:28:02 +02:00
p2pdma.c	PCI/P2PDMA: Avoid pci_get_slot(), which may sleep	2021-07-20 16:05:47 +02:00
pci-acpi.c
pci-bridge-emul.c	PCI: pci-bridge-emul: Set PCI_STATUS_CAP_LIST for PCIe device	2022-01-27 10:54:26 +01:00
pci-bridge-emul.h	PCI: pci-bridge-emul: Add PCIe Root Capabilities Register	2021-09-26 14:08:55 +02:00
pci-driver.c
pci-label.c	PCI/sysfs: Fix dsm_label_utf16s_to_utf8s() buffer overrun	2021-07-20 16:05:50 +02:00
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c
pci.c	PCI: Fix pci_dev_str_match_path() alloc while atomic bug	2021-09-22 12:28:03 +02:00
pci.h	PCI: pciehp: Ignore Link Down/Up caused by DPC	2021-07-20 16:05:47 +02:00
probe.c	PCI: Release OF node in pci_scan_device()'s error path	2021-05-19 10:13:01 +02:00
proc.c
quirks.c	PCI: Add function 1 DMA alias quirk for Marvell 88SE9125 SATA controller	2022-01-27 10:53:43 +01:00
remove.c
rom.c
search.c
setup-bus.c
setup-irq.c
setup-res.c
slot.c
syscall.c	PCI: Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure	2021-09-18 13:40:10 +02:00
vc.c
vpd.c	PCI: Allow VPD access for QLogic ISP2722	2021-05-14 09:49:57 +02:00
xen-pcifront.c