e951747a08
The locking here has always been a bit crazy and spread out, upon some careful analysis we can simplify things. Create a single function uverbs_destroy_ufile_hw() that internally handles all locking. This pulls together pieces of this process that were sprinkled all over the places into one place, and covers them with one lock. This eliminates several duplicate/confusing locks and makes the control flow in ib_uverbs_close() and ib_uverbs_free_hw_resources() extremely simple. Unfortunately we have to keep an extra mutex, ucontext_lock. This lock is logically part of the rwsem and provides the 'down write, fail if write locked, wait if read locked' semantic we require. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> |
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| Makefile | ||