xhci: Fix xhci debugfs devices node disappearance after hibernation

During system resume from hibernation, xhci host is reset, all the
nodes in devices folder are removed in xhci_mem_cleanup function.
Later nodes in /sys/kernel/debug/usb/xhci/* are created again in
function xhci_run, but the nodes already exist, so the nodes still
keep the old ones, finally device nodes in xhci debugfs folder
/sys/kernel/debug/usb/xhci/*/devices/* are disappeared.

This fix removed xhci debugfs nodes before the nodes are re-created,
so all the nodes in xhci debugfs can be re-created successfully.

Fixes: 02b6fdc2a153 ("usb: xhci: Add debugfs interface for xHCI driver")
Cc: <[email protected]> # v4.15
Signed-off-by: Zhengjun Xing <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 1eeb3396300f245fd1741f319cc62a5482487ed9..b01bd643f9051e17b8ec9af65b1f26a901d6f8e4 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1014,6 +1014,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 
                xhci_dbg(xhci, "cleaning up memory\n");
                xhci_mem_cleanup(xhci);
+               xhci_debugfs_exit(xhci);
                xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
                            readl(&xhci->op_regs->status));