> From: Robert Baldyga >> I want rather to inform users that non-blocking i/o wouldn't work for >> epfiles. Indeed we can handle O_NONBLOCK for ep0 (for the same reason we >> can have poll), but for other epfiles there is no way to check if >> read/write operation can end up in short time. Everything is up to host. On Tue, Apr 07 2015, David Laight wrote: > Is that really necessary? > I'm sure there are a lot of device drivers that ignore O_NONBLOCK. FFS partially supports O_NONBLOCK which may fool people into thinking it has full support. epfiles don’t implement poll though so I’m not sure how users would imagine O_NONBLOCK being used with them. ep0, on the other hand, implements poll and (as far as I can see and despite what Robert wrote) suffers from the same problem so it may be considered a bigger issue. Overall though, I do agree that we need to consider whether the current situation is really a serious problem. -- Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o ..o | Computer Science, Michał “mina86” Nazarewicz (o o) ooo +--<mpn@xxxxxxxxxx>--<xmpp:mina86@xxxxxxxxxx>--ooO--(_)--Ooo-- -- 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
