This doesn't sound like a particularly easy problem to solve.
However, it's simple to detect, and I suspect usb-storage should probably add a test to make sure incoming scatterlists are ok. Something like:
for (i = 0; i < (sg_len - 1); i++) {
if ((sg[i].length % ep_maxpacket) != 0) {
dev_err(... "no can do\n");
return -EINVAL;
}
}That is, only the last transfer can be "short". If failing is undesirable (vs non-success?) then the "EINVAL" case could eventually morph into some bounce-buffer strategy.
- Dave
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