From 735baf1b23458f71a8b15cb924af22c9ff9cd125 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan+linaro@kernel.org>
Date: Wed, 5 Apr 2023 11:03:42 +0200
Subject: [PATCH] xhci: fix debugfs register accesses while suspended
Git-commit: 735baf1b23458f71a8b15cb924af22c9ff9cd125
Patch-mainline: v6.4-rc1
References: git-fixes

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@vger.kernel.org # 4.15: 30332eeefec8: debugfs: regset32: Add Runtime PM support
Cc: stable@vger.kernel.org # 4.15
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230405090342.7363-1-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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);
 }
-- 
2.35.3