[PATCH 4.14 10/43] xhci: bail out early if driver cant accress host in resume

Greg Kroah-Hartman
2022-07-19T12:02:22Z

From: Mathias Nyman <mathias.nyman@linux.intel.com>

commit 72ae194704da212e2ec312ab182a96799d070755 upstream.

Bail out early if the xHC host needs to be reset at resume
but driver can't access xHC PCI registers.

If xhci driver already fails to reset the controller then there
is no point in attempting to free, re-initialize, re-allocate and
re-start the host. If failure to access the host is detected later,
failing the resume, xhci interrupts will be double freed
when remove is called.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200312144517.1593-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/host/xhci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1111,8 +1111,10 @@ int xhci_resume(struct xhci_hcd *xhci, b

xhci_dbg(xhci, "Stop HCD\n");
xhci_halt(xhci);
- xhci_reset(xhci);
+ retval = xhci_reset(xhci);
spin_unlock_irq(&xhci->lock);
+ if (retval)
+ return retval;
xhci_cleanup_msix(xhci);

xhci_dbg(xhci, "// Disabling event ring interrupts\n");