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arcfw(usb): when shutting down usb, ensure the device change callback is unlocked on the IOS side

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this prevents deadlocks when loading iosusb.sys in NT
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Rairii
2025-03-02 14:50:22 +00:00
parent 9ffdccfbf8
commit 0fd256c152
1 changed files with 51 additions and 0 deletions
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51
arcfw/source/ios_usb.c
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@@ -749,8 +749,59 @@ LONG UlInit(void) {
return Status;
}
static void UlpDeviceChangeCallback(LONG Status, ULONG Result, USB_INTERNAL_ASYNC_VARIANT Variant);
void UlShutdown(void) {
if (s_hUsbVen != IOS_HANDLE_INVALID) {
// Ensure async operations are done with.
// Might be stuck inside devicechange for both, this is allowed;
// allow one second for an async operation to complete, reset it if something completed.
UCHAR done = 0;
ULONG EndTime = currmsecs() + 1001;
while (done != (ARC_BIT(0) | ARC_BIT(1))) {
LONG Result;
PVOID Context;
USB_INTERNAL_ASYNC_STATE State;
bool doneOne = false;
if ((done & ARC_BIT(0)) == 0 && PxiIopIoctlAsyncPoll(s_AsyncIndexVen, &Result, &Context)) {
State = (USB_INTERNAL_ASYNC_STATE)Context;
if (State == STATE_DEVICE_CHANGE) UlpDeviceChangeCallback(Result, Result, VARIANT_VEN);
else if (State == STATE_ATTACH_FINISH) {
if (Result < 0) {
Result = PxiIopIoctlAsync(s_hUsbVen, USB_IOCTL_ATTACH_FINISH, NULL, 0, NULL, 0, IOCTL_SWAP_NONE, IOCTL_SWAP_NONE, (PVOID)STATE_ATTACH_FINISH);
if (Result < 0) done |= ARC_BIT(0);
else s_AsyncIndexVen = Result;
}
else done |= ARC_BIT(0);
}
doneOne = true;
}
if ((done & ARC_BIT(1)) == 0 && PxiIopIoctlAsyncPoll(s_AsyncIndexHid, &Result, &Context)) {
State = (USB_INTERNAL_ASYNC_STATE)Context;
if (State == STATE_DEVICE_CHANGE) UlpDeviceChangeCallback(Result, Result, VARIANT_HID);
else if (State == STATE_ATTACH_FINISH) {
if (Result < 0) {
Result = PxiIopIoctlAsync(s_hUsbHid, USB_IOCTL_ATTACH_FINISH, NULL, 0, NULL, 0, IOCTL_SWAP_NONE, IOCTL_SWAP_NONE, (PVOID)STATE_ATTACH_FINISH);
if (Result < 0) done |= ARC_BIT(1);
else s_AsyncIndexHid = Result;
}
else done |= ARC_BIT(1);
}
doneOne = true;
}
if (!doneOne) {
if (currmsecs() >= EndTime) {
break;
}
}
else EndTime = currmsecs() + 1001;
udelay(100);
}
PxiIopIoctl(s_hUsbHid, USB_IOCTL_SHUTDOWN, NULL, 0, NULL, 0, IOCTL_SWAP_NONE, IOCTL_SWAP_NONE);
PxiIopClose(s_hUsbHid);
PxiIopIoctl(s_hUsbVen, USB_IOCTL_SHUTDOWN, NULL, 0, NULL, 0, IOCTL_SWAP_NONE, IOCTL_SWAP_NONE);