From: Borislav Petkov <b...@suse.de>
Booting v5.1-rc1 causes these new messages in dmesg here:
genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 24
pcie_bw_notification: probe of 0000:00:02.0:pcie010 failed with error -22
because requesting a threaded IRQ with NULL handler needs to be oneshot.
Otherwise a level-triggered interrupt endless loop can happen, see the
detailed explanation above the "Threaded irq... " error message in
kernel/irq/manage.c.
And PCI-MSI type interrupts are one-shot safe but not in the IOAPIC
case:
24: ... IO-APIC 28-fasteoi PCIe BW notif, PCIe BW notif, PCIe BW notif
25: ... IO-APIC 29-fasteoi PCIe BW notif, PCIe BW notif
Make the BW notification handler oneshot too.
Fixes: e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth
notification")
Suggested-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Borislav Petkov <b...@suse.de>
Cc: Bjorn Helgaas <bhelg...@google.com>
Cc: Lukas Wunner <lu...@wunner.de>
Cc: Alexandru Gagniuc <mr.nuke...@gmail.com>
Cc: linux-...@vger.kernel.org
---
drivers/pci/pcie/bw_notification.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/pcie/bw_notification.c
b/drivers/pci/pcie/bw_notification.c
index d2eae3b7cc0f..16e11c09f6bd 100644
--- a/drivers/pci/pcie/bw_notification.c
+++ b/drivers/pci/pcie/bw_notification.c
@@ -81,7 +81,7 @@ static int pcie_bandwidth_notification_probe(struct
pcie_device *srv)
return -ENODEV;
ret = request_threaded_irq(srv->irq, NULL, pcie_bw_notification_handler,
- IRQF_SHARED, "PCIe BW notif", srv);
+ IRQF_SHARED | IRQF_ONESHOT, "PCIe BW notif",
srv);
if (ret)
return ret;
--
2.21.0
