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xhci: fix debugfs register accesses while suspended

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commit 735baf1b23458f71a8b15cb924af22c9ff9cd125 upstream.

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>
This commit is contained in:
Johan Hovold 2023-04-05 11:03:42 +02:00 committed by Greg Kroah-Hartman
parent 321e16a570
commit 9c0b37d0da
1 changed files with 1 additions and 0 deletions
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drivers/usb/host/xhci-debugfs.c
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@ -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);
}