linux-kernel - [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to IRQ

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Message-ID: <20210107113207epcms5p268119bdd826f36a0e5e488a5476f82ca@epcms5p2>
Date:   Thu, 07 Jan 2021 19:32:07 +0800
From:   李捷 <jie6.li@...sung.com>
To:     "mst@...hat.com" <mst@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     김경산 <ks0204.kim@...sung.com>,
        何兴 <xing84.he@...sung.com>,
        吕高飞 <gaofei.lv@...sung.com>
Subject: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals
 to IRQ_NOTCONNECTED

>From 0fbcd7e386898d829d3000d094358a91e626ee4a Mon Sep 17 00:00:00 2001
From: Jie Li <jie6.li@...sung.com>
Date: Mon, 7 Dec 2020 08:05:07 +0800
Subject: [PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to
 IRQ_NOTCONNECTED

Some devices use 255 as default value of Interrupt Line register, and this
maybe causes pdev->irq is set as IRQ_NOTCONNECTED in some scenarios. For
example, NVMe controller connects to Intel Volume Management Device (VMD).
In this situation, IRQ_NOTCONNECTED means INTx line is not connected, not
fault. If bind uio_pci_generic to these devices, uio frame will return
-ENOTCONN through request_irq.

This patch allows binding uio_pci_generic to device with dev->irq of
IRQ_NOTCONNECTED.

Signed-off-by: Jie Li <jie6.li@...sung.com>
Acked-by: Kyungsan Kim <ks0204.kim@...sung.com>
---
 drivers/uio/uio_pci_generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index b8e44d16279f..c7d681fef198 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -92,7 +92,7 @@ static int probe(struct pci_dev *pdev,
 	gdev->info.version = DRIVER_VERSION;
 	gdev->info.release = release;
 	gdev->pdev = pdev;
-	if (pdev->irq) {
+	if (pdev->irq && (pdev->irq != IRQ_NOTCONNECTED)) {
 		gdev->info.irq = pdev->irq;
 		gdev->info.irq_flags = IRQF_SHARED;
 		gdev->info.handler = irqhandler;
-- 
2.17.1