Felipe Balbi 7282c4ef0b
usb: dwc3: gadget: stop touching HWO TRBs ...
Say we have three requests prepared to the HW (reqA,
reqB, and reqC). All of them are composed of
SG-lists with several entries and they all requests
interrupt only on last TRBs of the SG-list.
When we get interrupt for reqA, it could be that
reqB is already half-way transferred and some of its
TRBs will have HWO already cleared.
It's okay to free up TRBs without HWO bit set, but
we need to guarantee we don't giveback a request
that's half-way transferred as that will confuse
gadget drivers.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com >
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