xhci_disable_slot() is a helper for disabling a slot when a device
goes away or recovers from error situations. Currently, it checks
the corespoding virt-dev pointer and returns directly (w/o issuing
disable slot command) if it's null.

This is unnecessary and will cause problems in case where virt-dev
allocation fails and xhci_disable_slot() is called to roll back the
hardware state. Refer to the implementation of xhci_alloc_dev().

This patch removes lines to check virt-dev in xhci_disable_slot().

Fixes: f9e609b82479 ("usb: xhci: Add helper function xhci_disable_slot().")
Cc: Guoqing Zhang <guoqing.zh...@intel.com>
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
 drivers/usb/host/xhci-hub.c | 3 +++
 drivers/usb/host/xhci.c     | 4 ----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 00721e8..6fcb98d 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -612,6 +612,9 @@ static int xhci_enter_test_mode(struct xhci_hcd *xhci,
        xhci_dbg(xhci, "Disable all slots\n");
        spin_unlock_irqrestore(&xhci->lock, *flags);
        for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
+               if (!xhci->devs[i])
+                       continue;
                retval = xhci_disable_slot(xhci, NULL, i);
                if (retval)
                        xhci_err(xhci, "Failed to disable slot %d, %d. Enter 
test mode anyway\n",
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index b2ff1ff..e69073f 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3567,11 +3567,7 @@ int xhci_disable_slot(struct xhci_hcd *xhci, struct 
xhci_command *command,
        unsigned long flags;
        u32 state;
        int ret = 0;
-       struct xhci_virt_device *virt_dev;
-       virt_dev = xhci->devs[slot_id];
-       if (!virt_dev)
-               return -EINVAL;
        if (!command)
                command = xhci_alloc_command(xhci, false, false, GFP_KERNEL);
        if (!command)

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