IB/uverbs: Fix reference counting usage of event files

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Fix the reference counting usage to be handled in the event file
creation/destruction function, instead of being done by the caller.
This is done for both async/non-async event files.

Based on Jason Gunthorpe report at https://www.mail-archive.com/
linux-rdma@vger.kernel.org/msg24680.html:
"The existing code for this is broken, in ib_uverbs_get_context all
the error paths between ib_uverbs_alloc_event_file and the
kref_get(file->ref) are wrong - this will result in fput() which will
call ib_uverbs_event_close, which will try to do kref_put and
ib_unregister_event_handler - which are no longer paired."

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

...

This commit is contained in:

Yishai Hadas 2015-08-13 18:32:02 +03:00 • committed by Doug Ledford

parent 7dd78647a2

commit 03c40442a0

3 changed files with 40 additions and 16 deletions

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1

drivers/infiniband/core/uverbs.h

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11

drivers/infiniband/core/uverbs_cmd.c

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44

drivers/infiniband/core/uverbs_main.c

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