Am Mittwoch, 1. September 2010, 18:33:43 schrieb David Brownell: > > --- On Wed, 9/1/10, Oliver Neukum <oneukum@xxxxxxx> wrote: > > > > > Am Dienstag, 31. August 2010, > > 21:23:05 schrieb David Brownell: > > > I thought the resolution was that any HCD which > > > requires alignment other than 1-byte was buggy; > > > trying to use it would break too many drivers, > > > and try to spread rude constaints to too many > > > subsystems that don't want such stuff any more > > > than the USB stack (doesn't want it). > > > > True. It is a requirenment that a HCD work with > > any kmalloced buffer. > > Not what I said at all ... there's a whole bunch > of generic "is this DMA-safe" constraints which > apply to USB just like the rest of Linux, and > none of them include alignment. I stand corrcted. > > Passing a pointer to a few bytes inside of a > kmalloc'd block has always been legit, even if > that pointer isn't aligned to N!=1 bytes. Is that also true with respect to usb_alloc_coherent() ? Regards Oliver -- 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
