From: Mathias Nyman mathias.nyman@linux.intel.com
[ Upstream commit 72ae194704da212e2ec312ab182a96799d070755 ]
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.co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/host/xhci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index dbac0fa9748d5..fe38275363e0f 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1157,8 +1157,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) xhci_dbg(xhci, "Stop HCD\n"); xhci_halt(xhci); xhci_zero_64b_regs(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");