[PATCH] xhci: fix debugfs register accesses while suspended

[Johan Hovold]

Wire up the debugfs regset device pointer so that the controller is
resumed before accessing registers to avoid crashing or locking up if it
happens to be runtime suspended.

Fixes: 02b6fdc2a153 ("usb: xhci: Add debugfs interface for xHCI driver")
Cc: stable@xxxxxxxxxxxxxxx # 4.15: 30332eeefec8: debugfs: regset32: Add Runtime PM support
Cc: stable@xxxxxxxxxxxxxxx # 4.15
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
---
 drivers/usb/host/xhci-debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c
index 0bc7fe11f749..99baa60ef50f 100644
--- a/drivers/usb/host/xhci-debugfs.c
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -133,6 +133,7 @@ static void xhci_debugfs_regset(struct xhci_hcd *xhci, u32 base,
 	regset->regs = regs;
 	regset->nregs = nregs;
 	regset->base = hcd->regs + base;
+	regset->dev = hcd->self.controller;
 
 	debugfs_create_regset32((const char *)rgs->name, 0444, parent, regset);
 }
-- 
2.39.2