On Saturday 06 October 2007, Jeff Garzik wrote:
>
> This always bugged me: dev_ioctl() called dev_ifsioc() either inside
> read_lock(dev_base_lock) or rtnl_lock(), depending on the ioctl being
> executed.
>
> This change moves the ioctls executed inside dev_base_lock to a new
> function, dev_ifsioc_locked(). Now the locking context is completely
> clear to the reader.
>
> Signed-off-by: Jeff Garzik <[email protected]>
Great idea!
I've been experimenting with a new compat_dev_ioctl() function along
the lines of what I just posted for the blkdev ioctls. For that, it
would be perfect to streamline dev_ioctl further:
* move the dev_load() and locking into dev_ifsioc{,_locked}
* move the copy_to_user step to a single place at the end of dev_ioctl
After that, we could have very simple dev_ioctl and compat_dev_ioctl
functions calling the same dev_ifsioc{,_locked} functions.
Arnd <><
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