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| author | Felipe Balbi <felipe.balbi@linux.intel.com> | 2019-01-11 12:58:52 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2019-01-28 12:53:15 +0200 |
| commit | b2b6d601365a1acb90b87c85197d797447bc9a2c (patch) | |
| tree | 117464870eb93c0e828effb33c1fec511d3ddca7 /drivers/usb/dwc3/gadget.c | |
| parent | a3af5e3ad3f11a0001317da9e9fb78b371c5f603 (diff) | |
| download | linux-b2b6d601365a1acb90b87c85197d797447bc9a2c.tar.gz linux-b2b6d601365a1acb90b87c85197d797447bc9a2c.tar.bz2 linux-b2b6d601365a1acb90b87c85197d797447bc9a2c.zip | |
usb: dwc3: gadget: prevent dwc3_request from being queued twice
Queueing the same request twice can introduce hard-to-debug
problems. At least one function driver - Android's f_mtp.c - is known
to cause this problem.
While that function is out-of-tree, this is a problem that's easy
enough to avoid.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 9fde48656044..064d5161c483 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1437,6 +1437,11 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) &req->request, req->dep->name)) return -EINVAL; + if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED, + "%s: request %pK already in flight\n", + dep->name, &req->request)) + return -EINVAL; + pm_runtime_get(dwc->dev); req->request.actual = 0; |