[Bug 220491] usb_storage connected SD card disconnects/reconnects on resume from suspend

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220491

--- Comment #24 from Alan Stern (stern@rowland.harvard.edu) ---
Mathias, your analysis looks right to me.

I suspect the whole problem comes down to two things:  (1) The card reader gets
disconnected during suspend, perhaps because of lack of power.  (2)
Re-establishing the USB-3 link races with the reset-resume processing in
usbcore.  That's why I suggested adding a 10-ms delay (maybe it needs to be
longer) at the right spot might fix everything; it would give the link time to
come back up before all the resets and other stuff start happening.

On the other hand, it might also be possible to resolve the races by changes to
xhci-hcd.  After all, re-establishing a link is already part of what our reset
routines do.  That would be preferable, if it works out.

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