From 2729eee3b942ecd93976194bfe327c20db487395 Mon Sep 17 00:00:00 2001
From: leiqi96 <leiqi96@hotmail.com>
Date: Thu, 5 Sep 2019 19:19:35 +0800
Subject: [PATCH] [Fix] ivshmem  does not support for interrupts when it is
 plain mode

---
 kernel_module/uio/uio_ivshmem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel_module/uio/uio_ivshmem.c b/kernel_module/uio/uio_ivshmem.c
index 63504ce..4abce32 100644
--- a/kernel_module/uio/uio_ivshmem.c
+++ b/kernel_module/uio/uio_ivshmem.c
@@ -180,7 +180,12 @@ static int ivshmem_pci_probe(struct pci_dev *dev,
 
 	if (request_msix_vectors(ivshmem_info, nvectors) != 0) {
 		printk(KERN_INFO "regular IRQs\n");
-		info->irq = dev->irq;
+		if (dev->pin) {
+			info->irq = dev->irq;
+		}else{
+			printk(KERN_INFO "No IRQ assigned to device: no support for interrupts?\n");
+			info->irq = -1;
+		}
 		info->irq_flags = IRQF_SHARED;
 		info->handler = ivshmem_handler;
 		writel(0xffffffff, info->mem[0].internal_addr + IntrMask);