IB/mthca: Fix gup usage in mthca_map_user_db()

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get_user_pages() must be called with mmap_sem held, currently
it is not. In fact it is called under the user db_table->mutex.
To fix this we can convert gup to use the fast alternative,
and safely avoid taking mmap_sem, if possible. Furthermore
this is safe wrt to the mutex as other callers that take the
lock (unmap and alloc_db) are not called under mmap_sem
(hence possible deadlock).

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Davidlohr Bueso 2018-01-25 11:27:27 -08:00 • committed by Doug Ledford

parent dc728f779a

commit 487f6683f1

1 changed files with 1 additions and 1 deletions

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drivers/infiniband/hw/mthca/mthca_memfree.c

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