forever when trying to remove the PCI device. Fix it by adding the missed percpu_ref_put(). Fixes: 7e9c7ef83d78 ("PCI/P2PDMA: Allow userspace VMA allocations through sysfs") Signed-off-by: Hou Tao Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe Reviewed-by: Alistair Popple Link: https://patch.msgid.link/20251220040446.274991-2-houtao@huaweicloud.com Signed-off-by: Sasha Levin --- drivers/pci/p2pdma.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4a2fc7ab42c34..218c1f5252b66 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -152,6 +152,7 @@ static int p2pmem_alloc_mmap(struct file *filp, struct kobject *kobj, ret = vm_insert_page(vma, vaddr, page); if (ret) { gen_pool_free(p2pdma->pool, (uintptr_t)kaddr, len); + percpu_ref_put(ref); return ret; } percpu_ref_get(ref); -- 2.51.0[PATCH 6.19 324/781] PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() failsGreg Kroah-Hartman undefinedstable@vger.kernel.org undefined undefined undefined undefined undefined undefined undefinedŸs†˜K