On Mon, Oct 23, 2017 at 05:46:18PM +0000, mario.limoncie...@dell.com wrote:
> Mika,
> 
> I'm not CC on patch 2/2 of this series (so apologies this probably won't come 
> in threaded right), but I 
> was curious and reviewed it from the web:
> http://www.spinics.net/lists/linux-doc/msg50034.html
> 
> Are you sure this is true?  When I saw this I tried it myself and didn't find 
> the need for rescanning.
> 1) I compiled thunderbolt.ko into the kernel.
> 2) I compiled latest fwupd which contains both thunderbolt and  
> thunderboltpower plugins.
> 3) Ran /usr/lib/fwupd/fwupd -v
> 4) Looked for thunderbolt and thunderboltpower related messages.
> 
> I saw that:
> 1) Thunderbolt Power was forced to 1
> 2) shortly later the thunderbolt uevent showed and device did enumerate in 
> fwupd successfully.
> 3) Thunderbolt power was set to 0
> 4) Thunderbolt remove event showed up soon (fwupd ignores the remove when 
> forcepowered though).
> 
> Is there something else needed to reproduce your behavior that prompted this 
> doc change?
> 
> If there is a situation like this, it makes sense for fwupd to also do the 
> rescan, but I would like to be able
> to reproduce it.

You are right, there is no need to rescan (like I commented earlier to
this patch). It is handled by whatever hotplug mechanism the system is
using. PCs typically use BIOS assisted hotplug.

I actually talked to Andy about this and he missed
CONFIG_HOTPLUG_PCI_ACPI from his custom .config.
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