On Tue, Oct 2, 2012 at 4:07 PM, Luis R. Rodriguez <mcgrof@do-not-panic.com> wrote:
do we actually need to specify a pointer to the ioctl callback, if the driver doesn't support ioctl?
What type of driver? For networking if you do not have ops->ndo_do_ioctl then -EOPNOTSUPP is returned. See dev_ifsioc() and prior to that dev_ioctl() on net/core/dev.c.
Luis
Hi Luis, Thanks for the reply, actually i see it in drivers/staging/csr/ this is in netdev.c here they do the below way csr_xxx_ioctl(....) { int ret; ret = -EOPNOTSUPP; return ret; } if the ioctl just needs to say that i am not going to support ioctl, then why we give the function address in the netdev_ops? as i understood from your reply that the dev_ioctl returns -EOPNOTSUPP when theres' no ioctl pointer registered in netdev_ops am i right? sorry for late reply,