Re: [PATCH] xhci: Reset controller on xhci shutdown

[Wen Xiong]

> Sure, but what does it mean exactly?
> Not even showing up in lspci output?

When executing "kexec -e", saw the error:
xhci_hcd 0005:01:00.0: Host halt failed. -110

USB device is still showed up in lspci but lsusb didn't show any
USB devices.
 #lspci|grep USB
0005:01:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 
3.0 xHCI Host Controller (rev 02)
[root@localhost ~]# lsusb

looks we saw a frozen USB subsystem during suspend/shutdown.

> Is this our problem and not PCI subsystem's?
> Are we sure it's not a bug elsewhere?
>
> (Last time somebody reported issues with kexec,
> it turned out to be an obscure Intel IOMMU bug).