This is a note to let you know that I've just added the patch titled s390/pci: do not set affinity for floating irqs to the 5.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: s390-pci-do-not-set-affinity-for-floating-irqs.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 86dbf32da150339ca81509fa2eb84c814b55258b Mon Sep 17 00:00:00 2001 From: Niklas Schnelle <schnelle@xxxxxxxxxxxxx> Date: Thu, 16 Apr 2020 13:44:30 +0200 Subject: s390/pci: do not set affinity for floating irqs From: Niklas Schnelle <schnelle@xxxxxxxxxxxxx> commit 86dbf32da150339ca81509fa2eb84c814b55258b upstream. with the introduction of CPU directed interrupts the kernel parameter pci=force_floating was introduced to fall back to the previous behavior using floating irqs. However we were still setting the affinity in that case, both in __irq_alloc_descs() and via the irq_set_affinity callback in struct irq_chip. For the former only set the affinity in the directed case. The latter is explicitly set in zpci_directed_irq_init() so we can just leave it unset for the floating case. Fixes: e979ce7bced2 ("s390/pci: provide support for CPU directed interrupts") Co-developed-by: Alexander Schmidt <alexs@xxxxxxxxxxxxx> Signed-off-by: Alexander Schmidt <alexs@xxxxxxxxxxxxx> Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx> Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/s390/pci/pci_irq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/arch/s390/pci/pci_irq.c +++ b/arch/s390/pci/pci_irq.c @@ -115,7 +115,6 @@ static struct irq_chip zpci_irq_chip = { .name = "PCI-MSI", .irq_unmask = pci_msi_unmask_irq, .irq_mask = pci_msi_mask_irq, - .irq_set_affinity = zpci_set_irq_affinity, }; static void zpci_handle_cpu_local_irq(bool rescan) @@ -276,7 +275,9 @@ int arch_setup_msi_irqs(struct pci_dev * rc = -EIO; if (hwirq - bit >= msi_vecs) break; - irq = __irq_alloc_descs(-1, 0, 1, 0, THIS_MODULE, msi->affinity); + irq = __irq_alloc_descs(-1, 0, 1, 0, THIS_MODULE, + (irq_delivery == DIRECTED) ? + msi->affinity : NULL); if (irq < 0) return -ENOMEM; rc = irq_set_msi_desc(irq, msi); Patches currently in stable-queue which might be from schnelle@xxxxxxxxxxxxx are queue-5.6/net-mlx5-fix-failing-fw-tracer-allocation-on-s390.patch queue-5.6/s390-pci-do-not-set-affinity-for-floating-irqs.patch