Greg KH wrote: > On Mon, May 13, 2002 at 10:33:00AM -0500, David Stroupe wrote: > >>#define THECALL _IOWR(UNIQUEMAGIC, 0x0d, DMA) >> > > This is correct, but your ioctl() call in your driver is getting a * to > the structure, not the structure itself. Also remember to call > copy_from_user() on the data before you start using it within the > kernel. > > Hope this helps, > > greg k-h > Thanks for clearing that up!!! In my driver I am doing this: DMA temp; copy_from_user(&temp, (DMA)arg, sizeof(DMA)); . . . copy_to_user((DMA)arg, &temp, sizeof(DMA)); I have noticed that if the passed stuff (DMA) size approaches a page (0x1000) in size I start to see the problem....is there a size limit involved here? I do see references to page faults in any oops that may occur if this call crashes. Thanks again David -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
