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From d6c5ce73edbc928cce19a095a27e2feff9db8884 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 11 Jul 2014 14:20:52 +0200
Subject: [PATCH 18/43] xhci: Add a few missing checks for disconnected devices

Message-id: <1405088470-24115-20-git-send-email-kraxel@redhat.com>
Patchwork-id: 59827
O-Subject: [RHEL-7.1 qemu-kvm PATCH 19/37] xhci: Add a few missing checks for disconnected devices
Bugzilla: 980833
RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>

From: Hans de Goede <hdegoede@redhat.com>

One of the reworks of qemu's usb core made changes to usb-port's disconnect
handling. Now ports with a device will always have a non 0 dev member, but
if the device is not attached (which is possible with usb redirection),
dev->attached will be 0.

So supplement all checks for dev to also check dev->attached, and add an
extra check in a path where a device check was completely missing.

This fixes various crashes (asserts triggering) I've been seeing when xhci
attached usb devices get disconnected at the wrong time.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit de9de157fbb9aa66380ab1973dd6ecf12fbd8b25)
---
 hw/usb/hcd-xhci.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/usb/hcd-xhci.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index ef0c073..944b255 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1498,7 +1498,8 @@ static TRBCCode xhci_reset_ep(XHCIState *xhci, unsigned int slotid,
     }
 
     if (!xhci->slots[slotid-1].uport ||
-        !xhci->slots[slotid-1].uport->dev) {
+        !xhci->slots[slotid-1].uport->dev ||
+        !xhci->slots[slotid-1].uport->dev->attached) {
         return CC_USB_TRANSACTION_ERROR;
     }
 
@@ -1985,6 +1986,14 @@ static void xhci_kick_ep(XHCIState *xhci, unsigned int slotid,
         return;
     }
 
+    /* If the device has been detached, but the guest has not noticed this
+       yet the 2 above checks will succeed, but we must NOT continue */
+    if (!xhci->slots[slotid - 1].uport ||
+        !xhci->slots[slotid - 1].uport->dev ||
+        !xhci->slots[slotid - 1].uport->dev->attached) {
+        return;
+    }
+
     if (epctx->retry) {
         XHCITransfer *xfer = epctx->retry;
 
@@ -2209,7 +2218,7 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
     trace_usb_xhci_slot_address(slotid, uport->path);
 
     dev = uport->dev;
-    if (!dev) {
+    if (!dev || !dev->attached) {
         fprintf(stderr, "xhci: port %s not connected\n", uport->path);
         return CC_USB_TRANSACTION_ERROR;
     }
-- 
1.8.3.1