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Subject[PATCH] usb: dwc2: only prevent new request when power_down is possible
Date
When controller is suspended, registers mustn't be touched. This is not
the case when 'power_down' is set to none. In this case, power saving
routines are skipped.

This fixes a case where gadget driver (f_acm) gets opened (cat /dev/ttyGS0)
but the bus has been suspended by the host:
- configfs-gadget gadget: acm ttyGS0 can't notify serial state, -11

Fixes: 7ababa926c66 ("usb: dwc2: gadget: prevent new request submission during suspend")
Fixes: 88b02f2cb1e1 ("usb: dwc2: Add core state checking")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/usb/dwc2/gadget.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 92ed32e..45a8782 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1375,7 +1375,8 @@ static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
req->zero, req->short_not_ok);

/* Prevent new request submission when controller is suspended */
- if (hs->lx_state != DWC2_L0) {
+ if (hs->params.power_down != DWC2_POWER_DOWN_PARAM_NONE &&
+ hs->lx_state != DWC2_L0) {
dev_dbg(hs->dev, "%s: submit request only in active state\n",
__func__);
return -EAGAIN;
--
2.7.4
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