On Tue, 12 Feb 2008 10:46:12 +0900, FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote: > On a serious note, it seems that two scatter lists per request leaded > to this bug. Can the scatter list in struct ub_request be removed? Good question. It's an eyesore to be sure. The duplication exists for the sake of retries combined with the separation of requests from commands. Please bear with me, if you're curious: commands can be launched without requests (at probe time, for instance, or when sense is requested). So, they need an s/g table. But then, the lifetime of a request is greater than than of a command, in case of a retry especially. Therefore a request needs the s/g table too. So, one way to kill this duplication is to mandate that a request existed for every command. It seemed like way more code than just one memcpy() when I wrote it. Another way would be to make commands flexible, e.g. sometimes with just a virtual address and size, sometimes with an s/g table. If you guys make struct scatterlist illegal to copy with memcpy one day, this is probably what I'll do. -- Pete - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
