I have a driver that uses an ioctl command to pass data from user space to the driver. When the driver gets called, copy_from_user returns a value of 652...the size of the data struct that should be copied. Upon additional checking, the ioctl argument representing the pointer to the struct has the same value as the user space data....so the pointer is correct. What would prevent the copy_from _user from doing its copy? TIA David -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
