Messages in this thread | | | Date | Sat, 4 May 2019 16:41:28 +0200 | From | Greg KH <> | Subject | Re: [PATCH V3 04/12] misc: xilinx_sdfec: Add open, close and ioctl |
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On Sat, May 04, 2019 at 10:35:02AM -0400, Arnd Bergmann wrote: > On Thu, May 2, 2019 at 1:23 PM Greg KH <gregkh@linuxfoundation.org> wrote: > > > > On Sat, Apr 27, 2019 at 11:04:58PM +0100, Dragan Cvetic wrote: > > > Add char device interface per DT node present and support > > > file operations: > > > - open(), > > > - close(), > > > - unlocked_ioctl(), > > > - compat_ioctl(). > > > > Why do you need compat_ioctl() at all? Any "new" driver should never > > need it. Just create your structures properly. > > The function he added was the version that is needed when the structures > are compatible. I submitted a series to add a generic 'compat_ptr_ioctl' > implementation that would save a few lines here doing the same thing, > but it's not merged yet. > > Generally speaking, every driver that has a .ioctl() function should also > have a .compat_ioctl(), and ideally it should be exactly this trivial > version.
Ok, for some reason I thought if there was no need for a compat ioctl (i.e. no pointer mess), then no need for a callback at all.
thanks,
greg k-h
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