staging: comedi: (core): add comedi_dev_from_file_info()
Setting `info = comedi_file_info_from_minor(minor)` and `dev = comedi_dev_from_minor(minor)` in the same function is a bit of a waste. The latter function is just a call of the former followed by a conditional return of an embedded pointer (`info->device`) or NULL. The former function uses a spin-lock which is where the wastfulness comes in. Move the "followed by a conditional return of an embedded pointer" part into a new function `comedi_dev_from_file_info` and call this instead of `comedi_dev_from_minor()` in the places where `comedi_file_info_from_minor()` is also called. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Showing
Please register or sign in to comment