[LPIA Hardy LBM] mac80211: Fix debugfs file add/del for netdev

[Stefan Bader]

Colin Ian King wrote:
> For: LPIA Hardy LBM, netbook-lpia branch
> 
> LP#387235
> 
> BugLink: https://bugs.launchpad.net/bugs/387235
> 
> Previous version was using incorrect union structures for non-AP
> interfaces when adding and removing max_ratectrl_rateidx and
> force_unicast_rateidx entries. Depending on the vif type, this ended
> up in corrupting debugfs entries since the dentries inside different
> union structures ended up going being on top of eachother.. As the
> end result, debugfs files were being left behind with references to
> freed data (instant kernel oops on access) and directories were not
> removed properly when unloading mac80211 drivers. This patch fixes
> those issues by using only a single union structure based on the vif
> type.
> 
> (Without this patch, debugfs entries are not deleted, causing kernel
> oops when they are accessed after rt73usb is removed.  This patch fixes
> this issue).
> 
> Attached: The patch
> 
> 
> 
ACK with two thoughts:
- Would this be useful for the generic disto as well?
- Is that still an issue upstream or has everything sufficiently changed?

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