device_rename - renames a device
2. SYNOPSIS ▲
int device_rename(struct device * dev , const char * new_name );
3. ARGUMENTS ▲
the pointer to the struct device to be renamed
the new name of the device
4. DESCRIPTION ▲
It is the responsibility of the caller to provide mutual exclusion between two different calls of device_rename on the same device to ensure that new_name is valid and wonAqt conflict with other devices.
5. NOTE ▲
DonAqt call this function. Currently, the networking layer calls this function, but that will change. The following text from Kay Sievers offers
6. SOME INSIGHT ▲
Renaming devices is racy at many levels, symlinks and other stuff are not replaced atomically, and you get a « move » uevent, but itAqs not easy to connect the event to the old and new device. Device nodes are not renamed at all, there isnAqt even support for that in the kernel now.
In the meantime, during renaming, your target name might be taken by another driver, creating conflicts. Or the old name is taken directly after you renamed it -- then you get events for the same DEVPATH, before you even see the « move » event. ItAqs just a mess, and nothing new should ever rely on kernel device renaming. Besides that, itAqs not even implemented now for other things than (driver-core wise very simple) network devices.
We are currently about to change network renaming in udev to completely disallow renaming of devices in the same namespace as the kernel uses, because we canAqt solve the problems properly, that arise with swapping names of multiple interfaces without races. Means, renaming of eth[0-9]* will only be allowed to some other name than eth[0-9]*, for the aforementioned reasons.
Make up a « real » name in the driver before you register anything, or add some other attributes for userspace to find the device, or use udev to add symlinks -- but never rename kernel devices later, itAqs a complete mess. We donAqt even want to get into that and try to implement the missing pieces in the core. We really have other pieces to fix in the driver core mess. :)
7. COPYRIGHT ▲