usb: dwc3: gadget: stop touching HWO TRBs

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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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Felipe Balbi 2016-10-25 13:50:46 +03:00

parent d86c5a676e

commit 7282c4ef0b

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drivers/usb/dwc3/gadget.c

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