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| author | Gerd Hoffmann <kraxel@redhat.com> | 2020-01-07 09:36:06 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2020-01-13 14:05:55 +0100 |
| commit | 236846a019c4f7aa3111026fc9a1fe09684c8978 (patch) | |
| tree | d8c8809028816fb8e5e3597897c52d9c462a6fe9 /hw/usb | |
| parent | 34b9d6a1f8dfa8da08e084a7193a1fa3f669164e (diff) | |
| download | qemu-236846a019c4f7aa3111026fc9a1fe09684c8978.zip qemu-236846a019c4f7aa3111026fc9a1fe09684c8978.tar.gz qemu-236846a019c4f7aa3111026fc9a1fe09684c8978.tar.bz2 | |
xhci: recheck slot status
Factor out slot status check into a helper function. Add an additional
check after completing transfers. This is needed in case a guest
queues multiple transfers in a row and a device unplug happens while
qemu processes them.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1786413
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200107083606.12393-1-kraxel@redhat.com
Diffstat (limited to 'hw/usb')
| -rw-r--r-- | hw/usb/hcd-xhci.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 0d3d96d..fb05de4 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1861,6 +1861,13 @@ static void xhci_kick_ep(XHCIState *xhci, unsigned int slotid, xhci_kick_epctx(epctx, streamid); } +static bool xhci_slot_ok(XHCIState *xhci, int slotid) +{ + return (xhci->slots[slotid - 1].uport && + xhci->slots[slotid - 1].uport->dev && + xhci->slots[slotid - 1].uport->dev->attached); +} + static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) { XHCIState *xhci = epctx->xhci; @@ -1878,9 +1885,7 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) /* 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[epctx->slotid - 1].uport || - !xhci->slots[epctx->slotid - 1].uport->dev || - !xhci->slots[epctx->slotid - 1].uport->dev->attached) { + if (!xhci_slot_ok(xhci, epctx->slotid)) { return; } @@ -1987,6 +1992,10 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) } else { xhci_fire_transfer(xhci, xfer, epctx); } + if (!xhci_slot_ok(xhci, epctx->slotid)) { + /* surprise removal -> stop processing */ + break; + } if (xfer->complete) { /* update ring dequeue ptr */ xhci_set_ep_state(xhci, epctx, stctx, epctx->state); |