On Fri, Jul 25 2014, Robert Baldyga wrote: > This patch adds virtual endpoint address mapping to functionfs. > > So far endpoint addresses given by user through endpoint descriptors > were ignored, and replaced by physical endpoint addresses. Endpoint > address in wIndex field of setup requesti, addressed to endpoint, was > the physical endpoint address, and names of files in functionfs > directory was numered in order, and were the same as indexes of > ffs_epfile in epfile array. In result user has no way to indicate > which file in functionfs is associated with which particular > requested endpoint. He also didn't know which endpoint is recipient > of setup request. Couldn't that be solved by simply providing the mapping to user space? > There was also one more problem - if endpoint addresses in descriptors > were non-consecutive, there were created redundant files, which could > cause problems in kernel, when user tryed to read/write to them. > It was result of fact that maximum endpoint address was taken as > total number of endpoints in funciton. This is kinda unrelated though. I mean it's a separate bug. > This patch solves this problems by introducing virtual endpoint address > mapping. Now each function has separate endpoint address space. Numbers > of endpoint files in functionfs and addresses in setup requests are > mapped to addresses choosen by user in endpoint descriptors. > > It also introduces additional testing if desctiptors given by user are > consistent - if number of endpoints and their addresses in each speed > are the same. > > Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx> > --- > drivers/usb/gadget/f_fs.c | 78 +++++++++++++++++++++++++++++++++++++++-------- > drivers/usb/gadget/u_fs.h | 2 ++ > 2 files changed, 68 insertions(+), 12 deletions(-) -- 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
