usb: cdns3: fix incorrect handling TRB_SMM flag for ISOC transfer
commit d5dcc336 upstream. The TRB_SMM flag indicates that DMA has completed the TD service with this TRB. Usually it’s a last TRB in TD. In case of ISOC transfer for bInterval > 1 each ISOC transfer contains more than one TD associated with usb request (one TD per ITP). In such case the TRB_SMM flag will be set in every TD and driver will recognize the end of transfer after processing the first TD with TRB_SMM. In result driver stops updating request->actual and returns incorrect actual length. To fix this issue driver additionally must check TRB_CHAIN which is not used for isochronous transfers. Fixes: 249f0a25 ("usb: cdns3: gadget: handle sg list use case at completion correctly") cc: <stable@vger.kernel.org> Acked-by:Peter Chen <peter.chen@kernel.org> Signed-off-by:
Pawel Laszczak <pawell@cadence.com> Link: https://lore.kernel.org/r/20220825062207.5824-1-pawell@cadence.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
142e8c06
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