linux-kernel - Problems with uio_pci

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Date:   Fri, 10 Aug 2018 21:12:19 +0000
From:   "Harris, James R" <james.r.harris@...el.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "xiubli@...hat.com" <xiubli@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Walker, Benjamin" <benjamin.walker@...el.com>,
        "Wodkowski, PawelX" <pawelx.wodkowski@...el.com>
Subject: Problems with uio_pci_generic in v4.18-rc8

Hi,

Using Linux kernel v4.18-rc8, I am unable to bind a PCI device to uio_pci_generic.  This works fine with v4.18-rc4.  dmesg shows:

[  336.221585] genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 33
[  336.221681] uio_pci_generic: probe of 0000:04:00.0 failed with error -22

This problem has been reproduced on multiple systems.

This seems to be related to commit 9421e45f5 (“uio: use request_threaded_irq instead”) which was merged in -rc5.  Reverting this commit fixes the issue (I also reverted 543af5861f and 57c5f4df0a which also touch uio.c - just to be safe).

This seems like a serious regression to uio_pci_generic, but any tips or pointers would be appreciated.

Thanks,

Jim Harris