This reverts commit 6f8245b4e37c ("usb: dwc3: gadget: always decrement
by 1").
We can't always decrement this value.
We should decrement only if the calculation of free slots results in a
LINK TRB being among one of the free slots (dequeue < enqueue).
Otherwise, if the LINK TRB is not among the free slots then it should
not be decremented.
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7a8d3d8..122e64d 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -884,9 +884,12 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
return DWC3_TRB_NUM - 1;
}
- trbs_left = dep->trb_dequeue - dep->trb_enqueue - 1;
+ trbs_left = dep->trb_dequeue - dep->trb_enqueue;
trbs_left &= (DWC3_TRB_NUM - 1);
+ if (dep->trb_dequeue < dep->trb_enqueue)
+ trbs_left--;
+
return trbs_left;
}
--
2.9.0
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