Patch "usb: xhci: Disable slot even when virt-dev is null" has been added to the 4.14-stable tree

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This is a note to let you know that I've just added the patch titled

    usb: xhci: Disable slot even when virt-dev is null

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-xhci-disable-slot-even-when-virt-dev-is-null.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From b64149ca016c25f30b39ac5a8f37cfb9017e19bb Mon Sep 17 00:00:00 2001
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Thu, 5 Oct 2017 11:21:40 +0300
Subject: usb: xhci: Disable slot even when virt-dev is null

From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

commit b64149ca016c25f30b39ac5a8f37cfb9017e19bb upstream.

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.zhang@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/host/xhci-hub.c |    3 +++
 drivers/usb/host/xhci.c     |    4 ----
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -634,6 +634,9 @@ static int xhci_enter_test_mode(struct x
 	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",
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3571,11 +3571,7 @@ int xhci_disable_slot(struct xhci_hcd *x
 	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)


Patches currently in stable-queue which might be from baolu.lu@xxxxxxxxxxxxxxx are

queue-4.14/usb-xhci-disable-slot-even-when-virt-dev-is-null.patch
queue-4.14/usb-xhci-fix-potential-memory-leak-in-xhci_disable_slot.patch



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