On 14-01-30 04:43 PM, Alan Stern wrote: > On Thu, 30 Jan 2014, Sarah Sharp wrote: > >> It should not matter what alignment or length of scatter-gather list the >> upper layers pass the xHCI driver, it should just work. I want to do >> this fix right, by changing the fundamental way we queue TRBs to the >> rings to fit the TD rules. We should break each TD into fragment-sized >> chunks, and add a link TRB in the middle of a segment where necessary. > > That's a good plan. However _some_ restriction will turn out to be > necessary. > > For example, what will you do if a driver submits an SG list containing > 300 elements, each 3 bytes long? Allocate a contiguous (bounce) buffer and copy the fragments to/from it? -- Mark Lord Real-Time Remedies Inc. mlord@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
