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DM: xHCI: Implement reset/stop endpiont error handler

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Add Null pointer check in reset and stop endpoint command handle
function to avoid Null pointer exception. Fllow xHCI spec 4.6.8 and
4.6.9, for stop and reset endpoint command, when the slot state is
Disabled the error code should be Slot Not Enabled Error, when the
slot have been enabled by an Enable Slot Command the error code should
be Context State Error.

Tracked-On: #5066
Signed-off-by: Long Liu <long.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

Signed-off-by: Long Liu <long.liu@intel.com>
This commit is contained in:
Long Liu 2020-07-22 05:56:30 +00:00 committed by wenlingz
parent 5d8f5023d0
commit 03fdb297d6
1 changed files with 24 additions and 0 deletions
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24
devicemodel/hw/pci/xhci.c
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@ -2300,6 +2300,30 @@ pci_xhci_cmd_reset_ep(struct pci_xhci_vdev *xdev,
type = XHCI_TRB_3_TYPE_GET(trb->dwTrb3);
dev = XHCI_SLOTDEV_PTR(xdev, slot);
/* There have three scenarios the pointer will be NULL.
* 1.Enable slot command not received.
* 2.Enable slot command have been received but not receive
* address device command.
* 3.After received disable slot command.
* In scenario 1 and 3 the slot state should be Disabled.
* In scenario 2, the slot state should be Enabled.
* Fllow xHCI spec 4.6.8 and 4.6.9, for stop and reset endpoint
* command, when the slot state is Disabled the error code should
* be Slot Not Enabled Error, when the slot have been enabled by
* an Enable Slot Command the error code should be Context State Error.
* TODO: The dev_slotstate should move from pci_xhci_dev_emu to
* pci_xhci_vdev, and slot_allocated need to removed.
*/
if (!dev)
{
if (xdev->slot_allocated[slot] == true)
cmderr = XHCI_TRB_ERROR_CONTEXT_STATE;
else
cmderr = XHCI_TRB_ERROR_SLOT_NOT_ON;
goto done;
}
if (type == XHCI_TRB_TYPE_STOP_EP &&
(trb->dwTrb3 & XHCI_TRB_3_SUSP_EP_BIT) != 0) {