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From d6c5ce73edbc928cce19a095a27e2feff9db8884 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 11 Jul 2014 14:20:52 +0200
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Subject: [PATCH 18/43] xhci: Add a few missing checks for disconnected devices
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Message-id: <1405088470-24115-20-git-send-email-kraxel@redhat.com>
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Patchwork-id: 59827
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 19/37] xhci: Add a few missing checks for disconnected devices
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Bugzilla: 980833
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Hans de Goede <hdegoede@redhat.com>
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One of the reworks of qemu's usb core made changes to usb-port's disconnect
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handling. Now ports with a device will always have a non 0 dev member, but
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if the device is not attached (which is possible with usb redirection),
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dev->attached will be 0.
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So supplement all checks for dev to also check dev->attached, and add an
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extra check in a path where a device check was completely missing.
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This fixes various crashes (asserts triggering) I've been seeing when xhci
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attached usb devices get disconnected at the wrong time.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit de9de157fbb9aa66380ab1973dd6ecf12fbd8b25)
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---
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hw/usb/hcd-xhci.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/hcd-xhci.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
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index ef0c073..944b255 100644
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--- a/hw/usb/hcd-xhci.c
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+++ b/hw/usb/hcd-xhci.c
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@@ -1498,7 +1498,8 @@ static TRBCCode xhci_reset_ep(XHCIState *xhci, unsigned int slotid,
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}
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if (!xhci->slots[slotid-1].uport ||
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- !xhci->slots[slotid-1].uport->dev) {
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+ !xhci->slots[slotid-1].uport->dev ||
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+ !xhci->slots[slotid-1].uport->dev->attached) {
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return CC_USB_TRANSACTION_ERROR;
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}
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@@ -1985,6 +1986,14 @@ static void xhci_kick_ep(XHCIState *xhci, unsigned int slotid,
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return;
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}
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+ /* If the device has been detached, but the guest has not noticed this
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+ yet the 2 above checks will succeed, but we must NOT continue */
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+ if (!xhci->slots[slotid - 1].uport ||
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+ !xhci->slots[slotid - 1].uport->dev ||
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+ !xhci->slots[slotid - 1].uport->dev->attached) {
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+ return;
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+ }
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+
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if (epctx->retry) {
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XHCITransfer *xfer = epctx->retry;
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@@ -2209,7 +2218,7 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
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trace_usb_xhci_slot_address(slotid, uport->path);
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dev = uport->dev;
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- if (!dev) {
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+ if (!dev || !dev->attached) {
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fprintf(stderr, "xhci: port %s not connected\n", uport->path);
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return CC_USB_TRANSACTION_ERROR;
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}
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--
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1.8.3.1
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