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Without patch unloading the dwc3-of-simple module went stuck after
successfully removing hcd.1 during the hcd.0 removal:
root@LEDE:/# rmmod dwc3-of-simple
[ 21.391846] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 21.391931] usb usb4: USB disconnect, device number 1
[ 21.397038] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered
[ 21.401111] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 21.406685] usb usb3: USB disconnect, device number 1
[ 21.412848] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered
[ 21.417248] xhci-hcd xhci-hcd.0.auto: remove, state 1
[ 21.422521] usb usb2: USB disconnect, device number 1
followed by nothing.
Sometimes a stall CPU was detected, or a kernel panic,
or a reboot occurred after a couple of minutes.
At the same time unloading the dwc3 module followed by dwc3-of-simple
module was working repeatedly.
root@LEDE:/# rmmod dwc3
[ 53.827328] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 53.827412] usb usb4: USB disconnect, device number 1
[ 53.832630] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered
[ 53.836452] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 53.842314] usb usb3: USB disconnect, device number 1
[ 53.848412] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered
[ 53.852542] xhci-hcd xhci-hcd.0.auto: remove, state 1
[ 53.857882] usb usb2: USB disconnect, device number 1
[ 53.863956] xhci-hcd xhci-hcd.0.auto: USB bus 2 deregistered
[ 53.867875] xhci-hcd xhci-hcd.0.auto: remove, state 1
[ 53.873696] usb usb1: USB disconnect, device number 1
[ 53.879742] xhci-hcd xhci-hcd.0.auto: USB bus 1 deregistered
root@LEDE:/# rmmod dwc3-of-simple
root@LEDE:/#
For the non-working case, the code was stuck in a readl() in
http://lxr.free-electrons.com/source/drivers/usb/host/xhci.c#L91
because
http://lxr.free-electrons.com/source/drivers/usb/dwc3/dwc3-of-simple.c#L126
was disabling the wrong clocks when removing hcd.1 (it was disabling
the clock of hcd.0). That's why the readl() went stuck when removing
hcd.0
The patch however addresses the clock assignment from the Netgear R7500
dts file and backs off the previous attempt.
Now unloading and repeated module loading is working just fine.
root@LEDE:/# rmmod dwc3-of-simple
[ 24.089679] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 24.089765] usb usb4: USB disconnect, device number 1
[ 24.094856] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered
[ 24.098963] xhci-hcd xhci-hcd.1.auto: remove, state 1
[ 24.104522] usb usb3: USB disconnect, device number 1
[ 24.111194] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered
[ 24.115086] xhci-hcd xhci-hcd.0.auto: remove, state 1
[ 24.120396] usb usb2: USB disconnect, device number 1
[ 24.126503] xhci-hcd xhci-hcd.0.auto: USB bus 2 deregistered
[ 24.130347] xhci-hcd xhci-hcd.0.auto: remove, state 1
[ 24.135948] usb usb1: USB disconnect, device number 1
[ 24.142085] xhci-hcd xhci-hcd.0.auto: USB bus 1 deregistered
root@LEDE:/#
Fixes: dwc3-of-simple module unloading for Netgear R7500
Signed-off-by: Thomas Reifferscheid <thomas@reifferscheid.org>
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