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lx_emul: increase usb driver dynamic robustness

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* Prevent page-faults when the active interface of a device got unset
  during elimination of the device
* Resets devices, where a corresponding session got closed to
  be re-useable when a new session gets opened

Ref #4512
This commit is contained in:
Stefan Kalkowski 2022-05-20 11:48:09 +02:00 committed by Christian Helmuth
parent ba6a3526a9
commit 115ac58fd0
1 changed files with 16 additions and 3 deletions
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19
repos/dde_linux/src/lib/lx_emul/usb.c
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@ -265,6 +265,10 @@ static int usb_rpc_call(void * data)
else
release_iface(iface);
}
if (usb_rpc_args.call == RELEASE_ALL)
usb_reset_device(udev);
usb_rpc_args.ret = ret;
}
return 0;
@ -456,6 +460,9 @@ static struct usb_interface * usb_get_iface_from_urb(struct urb * urb)
unsigned i, j;
struct usb_host_endpoint * ep = usb_pipe_endpoint(urb->dev, urb->pipe);
if (!ep || !urb->dev || !urb->dev->actconfig)
return NULL;
for (i = 0; i < urb->dev->actconfig->desc.bNumInterfaces; i++) {
struct usb_interface * iface = urb->dev->actconfig->interface[i];
if (!iface || !iface->cur_altsetting)
@ -473,7 +480,7 @@ static struct usb_interface * usb_get_iface_from_urb(struct urb * urb)
static void async_complete(struct urb *urb)
{
struct usb_interface * iface;
struct usb_iface_urbs * urbs;
struct usb_iface_urbs * urbs = NULL;
unsigned long handle = (unsigned long)urb->context;
genode_usb_session_handle_t session =
@ -485,8 +492,9 @@ static void async_complete(struct urb *urb)
handle_transfer_response, (void*)urb);
iface = usb_get_iface_from_urb(urb);
urbs = usb_get_intfdata(iface);
if (!urbs->in_delete) {
if (iface)
urbs = usb_get_intfdata(iface);
if (!urbs || !urbs->in_delete) {
usb_free_urb(urb);
lx_user_handle_io();
}
@ -621,6 +629,11 @@ handle_transfer_request(struct genode_usb_request_transfer * req,
if (!err) {
struct usb_iface_urbs * urbs;
struct usb_interface * iface = usb_get_iface_from_urb(urb);
if (!iface) {
usb_free_urb(urb);
return NO_DEVICE_ERROR;
}
if (!usb_interface_claimed(iface))
claim_iface(iface);
urbs = usb_get_intfdata(iface);