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SubjectRe: Problems with uio_pci_generic in v4.18-rc8
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Hi Harris,

Since the lock protection in uio irq handler is useless currently as
discussed in the mail list, so I will revert this commit with small
changes and now the testing based LIO/TCMU has been finished.

Thanks,
BRs


On 2018/8/11 5:12, Harris, James R wrote:
> 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
>

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