github/acrn-hypervisor
1
0
Fork 0
mirror of https://github.com/projectacrn/acrn-hypervisor.git synced 2025-05-24 16:14:39 +00:00
Code Issues Projects Releases Wiki Activity

DM USB: xHCI: fix issue: crash when plug device during UOS booting

Browse Source 
This issue is result from reporting interrupt when the interrupt ability
of virtual xHCI is disabled.

As Event Ring State Machine showed in Figure 20 of xHCI spec, following
rules should be followed:
1 when RS bit of USBCMD register is zero, Event Ring should not be accessed;
2 when INTE bit of USBCMD register is zero, Interrupt should not be sent.

Tracked-On: #1566
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Reviewed-by: Liang Yang <liang3.yang@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Xiaoguang Wu 2018-10-21 01:17:18 +08:00 committed by wenlingz
parent 3d94f86812
commit d7008408d0
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
devicemodel/hw/pci/xhci.c
View File

@ -1043,6 +1043,12 @@ pci_xhci_change_port(struct pci_xhci_vdev *xdev, int port, int usb_speed,
if (!need_intr)
return 0;
if (!(xdev->opregs.usbcmd & XHCI_CMD_INTE))
need_intr = 0;
if (!(xdev->opregs.usbcmd & XHCI_CMD_RS))
return 0;
/* make an event for the guest OS */
pci_xhci_set_evtrb(&evtrb,
port,