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authorJie Li <jie6.li@samsung.com>2021-02-01 07:25:59 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-02-09 14:25:32 +0300
commit61de21a8315147da08a37ff8db2716739977eadc (patch)
treee737eccf817324a7ee2edd3d28706c75e6586b95 /drivers/uio
parent2fd10bcf0310b9525b2af9e1f7aa9ddd87c3772e (diff)
downloadlinux-61de21a8315147da08a37ff8db2716739977eadc.tar.xz
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. Acked-by: Kyungsan Kim <ks0204.kim@samsung.com> Signed-off-by: Jie Li <jie6.li@samsung.com> Link: https://lore.kernel.org/r/1612153559-17028-1-git-send-email-jie6.li@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uio')
-rw-r--r--drivers/uio/uio_pci_generic.c2
1 files changed, 1 insertions, 1 deletions
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;