Re: [Bug 215590] New: PCI link is down after suspend after we try to plug device

Re: [Bug 215590] New: PCI link is down after suspend after we try to plug device

[Bjorn Helgaas]

On Fri, Feb 11, 2022 at 02:29:33PM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=215590
> 
>            Summary: PCI link is down after suspend after we try to plug
>                     device
>     Kernel Version: 5.4 and 5.11
>           Hardware: x86-64
>                 OS: Linux
>               Tree: Mainline
>           Severity: high
>           Priority: P1
>         Regression: No
> 
> Created attachment 300434
>   --> https://bugzilla.kernel.org/attachment.cgi?id=300434&action=edit
> dmesg log
> 
> PCI link is not coming up
> 
> we have been facing a race condition between AER and hoptplug stack which is
> happening after suspend when device is unplugged, to avoid that  we have used
> below three patches.
> 
> 1 - To Avoid lockdep
> 
> https://lore.kernel.org/linux-pci/908047f7699d9de9ec2efd6b79aa752d73dab4b6.1595329748.git.lukas@wunner.de/
> 
> 2 - AER sleep transition patch 
> https://lore.kernel.org/linux-pci/20220127025418.1989642-1-kai.heng.feng@canonical.com/
> 
> 3 - DPC sleep transition patch
> https://lore.kernel.org/linux-pci/20220127025418.1989642-2-kai.heng.feng@canonical.com/
> 
> 
> Additional info when we are using unplug using sysfs we dont see the issue