lkml.org 
[lkml]   [2020]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: MSI irqchip configured as IRQCHIP_ONESHOT_SAFE causes spurious IRQs
Resending with correct e-mail address of maz.

On Mon, Dec 9, 2019 at 12:27 PM Ramon Fried <rfried.dev@gmail.com> wrote:
>
> Hi,
> While debugging the root cause of spurious IRQ's on my PCIe MSI line it appears
> that because of the line:
> info->chip->flags |= IRQCHIP_ONESHOT_SAFE;
> in pci_msi_create_irq_domain()
> The IRQF_ONESHOT is ignored, especially when requesting IRQ through
> pci_request_threaded_irq() where handler is NULL.
>
> The problem is that the MSI masking now only surrounds the HW handler,
> and all additional MSI that occur before the threaded handler is
> complete are considered by the note_interrupt() as spurious.
>
> Besides the side effect of that, I don't really understand the logic
> of not masking the MSI until the threaded handler is complete,
> especially when there's no HW handler and only threaded handler.
>
> Your thoughts?
>
> Thank,
> Ramon.

\
 
 \ /
  Last update: 2020-01-13 16:00    [W:0.072 / U:14.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site