diff options
| author | Gregory Herrero <gregory.herrero@intel.com> | 2015-04-29 22:09:08 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-04-29 15:19:19 -0500 |
| commit | 7ababa926c66c5c5a862489b475ff5d96a7dd03a (patch) | |
| tree | 8a33132478b56169437201adad16d3d883fddc11 /drivers/usb/dwc2 | |
| parent | 9e779778ad7e503434aa76bfc96f98d7d7b2d139 (diff) | |
| download | linux-7ababa926c66c5c5a862489b475ff5d96a7dd03a.tar.gz linux-7ababa926c66c5c5a862489b475ff5d96a7dd03a.tar.bz2 linux-7ababa926c66c5c5a862489b475ff5d96a7dd03a.zip | |
usb: dwc2: gadget: prevent new request submission during suspend
If usb controller is in partial power down, any write to registers may
cause unpredictable behavior.
Thus, prevent any new request submission once controller is in partial
power down.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc2')
| -rw-r--r-- | drivers/usb/dwc2/gadget.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index a360f49d3fd0..732761f9466b 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -790,6 +790,13 @@ static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, ep->name, req, req->length, req->buf, req->no_interrupt, req->zero, req->short_not_ok); + /* Prevent new request submission when controller is suspended */ + if (hs->lx_state == DWC2_L2) { + dev_dbg(hs->dev, "%s: don't submit request while suspended\n", + __func__); + return -EAGAIN; + } + /* initialise status of the request */ INIT_LIST_HEAD(&hs_req->queue); req->actual = 0; |